Long-tail of email infrastructure — 2026-04-27

Deep-dive into the Unknown / Generic MX bucket — the deliverability reality outside the Google / Microsoft monoculture.

At a glance

Unknown / Generic49.69%330 519 domainsUnique unmatched MX197 442individual hostnamesSelf-hosted23.24%154 624 domains

What is this report?

Most landing-page summaries focus on the head of the distribution — Google Workspace, Microsoft 365, Yandex 360. About one in four domains in the Tranco top-1M lives outside that head: regional hosters, self-built Postfix/Exim, niche ESPs, corporate on-prem gateways. This is where most deliverability surprises actually happen. This page surfaces the raw long-tail so security researchers, deliverability teams and dictionary maintainers can mine it.

Top 1000 most common unmatched MX hosts

Sorted by number of domains using each. This is the practical feed-list — every entry near the top is a candidate for inclusion in our dictionaries/mx_providers.py. CSV download covers all 1000.

#	MX target	Domains
1	route1.mx.cloudflare.net	9 148
2	route3.mx.cloudflare.net	9 146
3	route2.mx.cloudflare.net	9 144
4	eforward5.registrar-servers.com	6 578
5	eforward1.registrar-servers.com	6 577
6	eforward4.registrar-servers.com	6 573
7	eforward2.registrar-servers.com	6 571
8	eforward3.registrar-servers.com	6 564
9	mx1.hostinger.com	5 862
10	mx2.hostinger.com	5 850
11	smtp.secureserver.net	4 948
12	mailstore1.secureserver.net	4 941
13	nan	4 409
14	mx2-hosting.jellyfish.systems	2 401
15	mx3-hosting.jellyfish.systems	2 393
16	mx1-hosting.jellyfish.systems	2 382
17	mx1-us1.ppe-hosted.com	2 085
18	mx2-us1.ppe-hosted.com	2 067
19	mx20.antispam.mailspamprotection.com	1 828
20	mx10.antispam.mailspamprotection.com	1 827
21	mx30.antispam.mailspamprotection.com	1 825
22	mx1.privateemail.com	1 705
23	mx2.privateemail.com	1 691
24	park-mx.above.com	1 320
25	mx01.hornetsecurity.com	1 234
26	mx02.hornetsecurity.com	1 227
27	mx03.hornetsecurity.com	1 197
28	mx04.hornetsecurity.com	1 188
29	smtpin.rzone.de	1 050
30	mx1.mailchannels.net	994
31	mx2.mailchannels.net	989
32	mx.stackmail.com	972
33	isaac.mx.cloudflare.net	927
34	amir.mx.cloudflare.net	925
35	linda.mx.cloudflare.net	925
36	mx1.qiye.aliyun.com	897
37	mx.a.locaweb.com.br	880
38	mx2.qiye.aliyun.com	878
39	mx.b.locaweb.com.br	871
40	mx.jk.locaweb.com.br	868
41	mx3.qiye.aliyun.com	866
42	mx.core.locaweb.com.br	786
43	mx2.feishu.cn	719
44	mx.spamexperts.com	719
45	mx1.feishu.cn	717
46	mx3.feishu.cn	717
47	fallbackmx.spamexperts.eu	706
48	lastmx.spamexperts.net	698
49	mta-gw.infomaniak.ch	673
50	us2.mx3.mailhostbox.com	659

Show rows 51 – 1000

#	MX target	Domains
51	us2.mx1.mailhostbox.com	655
52	us2.mx2.mailhostbox.com	654
53	mx1.csof.net	652
54	mx2.csof.net	652
55	mx.securemx.jp	622
56	mx1.hostinger.in	615
57	mxlb.ispgateway.de	612
58	mx2.hostinger.in	607
59	za-smtp-inbound-1.mimecast.co.za	588
60	za-smtp-inbound-2.mimecast.co.za	586
61	dmail.kagoya.net	554
62	mx01.nicmail.ru	496
63	mx1.forwardemail.net	495
64	mx15.ukraine.com.ua	491
65	mx20.ukraine.com.ua	491
66	mx2.forwardemail.net	489
67	mx02.nicmail.ru	485
68	mx10.mailspamprotection.com	484
69	mx03.nicmail.ru	483
70	mx20.mailspamprotection.com	483
71	mx30.mailspamprotection.com	475
72	mail.register.it	433
73	mailstream-east.mxrecord.io	424
74	mailstream-west.mxrecord.io	423
75	mx156.hostedmxserver.com	415
76	mailstream-central.mxrecord.mx	408
77	mx.ukraine.com.ua	386
78	mx001.netsol.xion.oxcs.net	386
79	mx002.netsol.xion.oxcs.net	386
80	mx.serviciodecorreo.es	385
81	mx1-eu1.ppe-hosted.com	377
82	mx2-eu1.ppe-hosted.com	373
83	mx2.larksuite.com	366
84	mx1.larksuite.com	365
85	mx3.larksuite.com	364
86	mxext1.mailbox.org	355
87	mxext2.mailbox.org	353
88	mx01.udag.de	352
89	mx00.udag.de	351
90	localhost	347
91	mxext3.mailbox.org	346
92	mx2.spaceweb.ru	345
93	mx1.spaceweb.ru	344
94	mx-01-eu-central-1.prod.hydra.sophos.com	343
95	mx.mgovcloud.in	342
96	mx.plingest.com	341
97	mx2.mgovcloud.in	340
98	mx3.mgovcloud.in	340
99	mx01.lolipop.jp	337
100	mx-02-eu-central-1.prod.hydra.sophos.com	335
101	kr1-aspmx1.worksmobile.com	331
102	kr1-aspmx2.worksmobile.com	315
103	in.arubabusiness.it	309
104	asapsemi1.mail.protection.office365.us	308
105	mx-biz.mail.am0.yahoodns.net	305
106	mx1.dreamhost.com	285
107	mailstream-eu1.mxrecord.io	285
108	mx2.dreamhost.com	282
109	mail	282
110	mx-1.dpoczta.pl	257
111	mx-2.dpoczta.pl	256
112	fwd1.porkbun.com	251
113	mx01.whmpanels.com	250
114	mx02.whmpanels.com	250
115	mx03.whmpanels.com	250
116	fwd2.porkbun.com	249
117	mx.services	245
118	mx003.netsol.xion.oxcs.net	239
119	mx004.netsol.xion.oxcs.net	239
120	mailcluster.loopia.se	238
121	vlmx-air.secure.ne.jp	234
122	mx1.agenturserver.de	229
123	mx.mailprotect.be	227
124	mx2.agenturserver.de	224
125	mxavas.forpsi.com	223
126	mx-01-us-west-2.prod.hydra.sophos.com	222
127	mx.backup.mailprotect.be	220
128	primary.us.email.fireeyecloud.com	220
129	mailapp.hiworks.co.kr	220
130	mx01.cloud.vadesecure.com	219
131	alt1.us.email.fireeyecloud.com	219
132	mx4.agenturserver.de	219
133	mail2.loopia.se	218
134	mx3.agenturserver.de	218
135	mx02.cloud.vadesecure.com	217
136	mx-02-us-west-2.prod.hydra.sophos.com	216
137	alt2.us.email.fireeyecloud.com	216
138	alt3.us.email.fireeyecloud.com	216
139	mx04.cloud.vadesecure.com	215
140	mx03.cloud.vadesecure.com	214
141	mx1.123-reg.co.uk	212
142	sagw.fsi.ne.jp	210
143	mx0.123-reg.co.uk	208
144	smtp.rzone.de	200
145	mx-vip-01.kinghost.net	192
146	util01.verticalscope.com	190
147	mx03.secure-mailgate.com	190
148	mx-vip-02.kinghost.net	190
149	~	189
150	mx04.secure-mailgate.com	189
151	mx-01-us-east-2.prod.hydra.sophos.com	189
152	mx.uhserver.com	188
153	mx01.1and1.com	186
154	mx-02-us-east-2.prod.hydra.sophos.com	186
155	mx01.dm.aliyun.com	185
156	mx00.1and1.com	180
157	mx1.hostinger.com.br	180
158	mx1-usg2.ppe-hosted.com	177
159	mx.transip.email	177
160	mx3-usg2.ppe-hosted.com	176
161	mx2-usg2.ppe-hosted.com	175
162	zonemx.eu	173
163	mail1.sbnation.com	172
164	mail.autoline.com.ua	172
165	mx2.z-ns.net	171
166	mx-vip-01.uni5.net	169
167	mx.uzmanposta.com	169
168	mx2.hostinger.com.br	168
169	mx-vip-02.uni5.net	168
170	mx1-usg1.ppe-hosted.com	168
171	mx2-usg1.ppe-hosted.com	168
172	mx3-usg1.ppe-hosted.com	168
173	s0.protection.ticimax.com	165
174	s1.protection.ticimax.com	165
175	s2.protection.ticimax.com	165
176	mx1.mtaroutes.com	165
177	mx2.mtaroutes.com	161
178	mx1.mirohost.net	160
179	mx3.mtaroutes.com	157
180	mx4.mtaroutes.com	155
181	vade-mx-fr01.hornetsecurity.com	153
182	vade-mx-fr02.hornetsecurity.com	152
183	vade-mx-eu-fallback01.hornetsecurity.com	152
184	vade-mx-eu-fallback02.hornetsecurity.com	151
185	mx-01-eu-west-1.prod.hydra.sophos.com	151
186	mx-02-eu-west-1.prod.hydra.sophos.com	150
187	mx1.emailsendhub.com	149
188	mx1-eu.emailsecurity.app	148
189	mx01.dondominio.com	148
190	mx2-eu.emailsecurity.app	147
191	mx1.myshoptet.com	145
192	mx2.myshoptet.com	144
193	10mx.zoner.com	144
194	relay.zoner.com	143
195	15mx.zoner.com	143
196	mxa-00181c02.gslb.pphosted.com	143
197	wes1-mx2.wedos.net	141
198	mxb-00181c02.gslb.pphosted.com	140
199	alltheemails.com	138
200	wes1-mx1.wedos.net	138
201	mx.email-messaging.com	138
202	mxtls.expurgate.net	137
203	mx-caprica.easydns.com	135
204	mx1.relay.renater.fr	135
205	mx1.spacemail.com	134
206	mx2.spacemail.com	134
207	filter10.antispamcloud.com	133
208	mx2.relay.renater.fr	133
209	filter20.antispamcloud.com	132
210	smtp1-msp.securence.com	132
211	mxa-009d5501.gslb.pphosted.com	131
212	mxb-009d5501.gslb.pphosted.com	131
213	filter30.antispamcloud.com	130
214	smtp1-mke.securence.com	130
215	offline.iserv.eu	129
216	filter40.antispamcloud.com	128
217	mx1.mxfilter.net	126
218	mx2.mxfilter.net	126
219	mxa.global.inbound.cf-emailsecurity.net	123
220	mxb.global.inbound.cf-emailsecurity.net	123
221	mx3.mxfilter.net	122
222	relay1.netnames.net	122
223	relay2.netnames.net	122
224	m1.feishu.cn	122
225	mx1.mail.hostpoint.ch	121
226	mx2.mail.hostpoint.ch	120
227	mxb-00596a01.gslb.pphosted.com	120
228	mx1.krystal.uk	120
229	mx2.krystal.uk	120
230	mxa-00596a01.gslb.pphosted.com	119
231	uk.mx1.mailanyone.net	117
232	uk.mx2.mx25.net	117
233	mw-002.cafe24.com	115
234	uk.mx3.mailanyone.net	115
235	se.mx1.mailanyone.net	114
236	se.mx2.mx25.net	114
237	mxi.alpha-prm.jp	112
238	mail.eye-mail.net	111
239	lne.in.tmes.trendmicro.com	111
240	mx.vshosting.cloud	111
241	mx1.ticketsinbound.com	111
242	mx.simply.com	110
243	uk.mx4.mx25.net	110
244	mail.imena.com.ua	109
245	se.mx3.mailanyone.net	109
246	mx2.ticketsinbound.com	109
247	mx364.umbler.com	108
248	mx128.umbler.in	108
249	mx783.umbler.com.br	108
250	mx240.umbler.co.uk	108
251	mx00.1and1.co.uk	108
252	se.mx4.mx25.net	108
253	mx-ha.skymail.net.br	107
254	cloudmail.auto-vision.ru	105
255	mx01.1and1.co.uk	105
256	poster4i.iberlayer.com	105
257	poster2i.iberlayer.com	105
258	mx01.lancloud.ru	105
259	mx02.lancloud.ru	105
260	mx04.lancloud.ru	105
261	mwpremgw1.ocn.ad.jp	105
262	mx.fakemx.net	104
263	mx.263.net	104
264	mx1.cleanmx.pt	104
265	poster1i.iberlayer.com	104
266	mwpremgw2.ocn.ad.jp	104
267	void.blackhole.mx	103
268	mx2.cleanmx.pt	103
269	poster3i.iberlayer.com	103
270	mx03.lancloud.ru	103
271	mailin.mx-hub.cz	103
272	mailin.mx-hub.sk	103
273	mail2.namebrightmail.com	102
274	mailserver.livemail.co.uk	102
275	mxw.263.net	102
276	mx10.websupport.sk	102
277	mx20.websupport.sk	102
278	mxa-0024c501.gslb.pphosted.com	101
279	mxb-0024c501.gslb.pphosted.com	101
280	s.mail.dcsaas.net	101
281	mxdm-ap-southeast-1.aliyun.com	100
282	mail1.namebrightmail.com	99
283	mail.iq.pl	99
284	mailin.mx-hub.eu	99
285	mailin.mx-hub.net	98
286	mx19a.antispameurope.com	97
287	cluster1.us.messagelabs.com	96
288	mx1d10.thinline.cz	96
289	mx.zoho.com.cn	95
290	mx.zoho.com.au	95
291	mx2.zoho.com.au	95
292	wes1-mx-backup.wedos.net	95
293	mx1b20.thinline.cz	95
294	mx2.zoho.com.cn	94
295	mx.domeneshop.no	94
296	mx01.mailplug.com	94
297	mx3.zoho.com.au	94
298	mail.global.frontbridge.com	94
299	mx19b.antispameurope.com	94
300	mx02.mailplug.com	93
301	mx1.iq.pl	93
302	mx19c.antispameurope.com	93
303	mx19d.antispameurope.com	93
304	mail.rediffmailpro.com	92
305	mxa-002fa101.gslb.pphosted.com	91
306	mxb-002fa101.gslb.pphosted.com	91
307	mx.hetemail.jp	89
308	mxb-00262c01.gslb.pphosted.com	89
309	mxa-00262c01.gslb.pphosted.com	89
310	mx1-us2.ppe-hosted.com	89
311	cluster1a.us.messagelabs.com	89
312	amazon-smtp.amazon.com	89
313	smtp-fwd.wordpress.com	88
314	mx-in02.eu.retarus.com	88
315	mx0.webpack.hosteurope.de	87
316	mx-in01.eu.retarus.com	87
317	mx1.email-cluster.com	86
318	mx2.email-cluster.com	86
319	mx2-us2.ppe-hosted.com	85
320	mx1.atmosphere.facct.ru	83
321	failover1.email-cluster.com	83
322	mx4.name.com	82
323	mx3.name.com	82
324	relay.transip.nl	82
325	mx2.atmosphere.facct.ru	82
326	mx1.zenbox.pl	82
327	cluster8.eu.messagelabs.com	82
328	mx6.name.com	81
329	mx5.name.com	81
330	mx8.name.com	81
331	mxa-0077b904.gslb.pphosted.com	81
332	mxb-0077b904.gslb.pphosted.com	81
333	mx-backup.serveriai.lt	81
334	mx7.name.com	80
335	mailforward.dnsv.jp	80
336	mxa-00176a04.gslb.pphosted.com	80
337	mxb-00176a04.gslb.pphosted.com	80
338	mx0a-00176a04.pphosted.com	80
339	mx0b-00176a04.pphosted.com	80
340	mx3.zenbox.pl	80
341	mx2.zenbox.pl	79
342	cluster5.eu.messagelabs.com	79
343	mx1.yunyou.top	78
344	mx.maxns.net	78
345	mx.webmo.fr	78
346	gmail22.gadmail.de	78
347	gmail23.gadmail.de	78
348	wmail22.gadmail.de	78
349	mail.intermaxgroup.com	78
350	antispam1.ihs.com.tr	77
351	antispam2.ihs.com.tr	77
352	smtp.faisco.cn	77
353	mxint01.1and1.com	77
354	mxint02.1and1.com	77
355	mx-01.mail-forwarder.io	77
356	cluster5a.eu.messagelabs.com	77
357	cluster8a.eu.messagelabs.com	77
358	athena.hosts.co.uk	77
359	wmail23.gadmail.de	77
360	mx2.yunyou.top	76
361	mx1-dk.centerasecurity.dk	76
362	mx2-dk.centerasecurity.dk	76
363	mx-proxy501.heteml.jp	76
364	mx4.mxfilter.net	76
365	relay.rzone.de	76
366	hermes.hosts.co.uk	76
367	mx-02.kurumsaleposta.com	75
368	sitemail.everyone.net	74
369	mx-proxy502.heteml.jp	74
370	mx.vshosting.eu	74
371	mx-02.mail-forwarder.io	74
372	mx-01.kurumsaleposta.com	74
373	mx.mymagenta.business	73
374	mx6.kvnbw.de	73
375	mx7.kvnbw.de	73
376	mx8.kvnbw.de	73
377	mx9.kvnbw.de	73
378	mx2.sgict.gov.sg	72
379	mx1.sgict.gov.sg	72
380	mx4.sgict.gov.sg	72
381	rmail22.gadmail.de	72
382	rmail23.gadmail.de	72
383	smtp-avas.seeweb.it	71
384	mx3.sgict.gov.sg	71
385	omail22.gadmail.de	71
386	omail23.gadmail.de	71
387	posta.mediacenter.hu	70
388	posta2.mediacenter.hu	70
389	posta4.mediacenter.hu	70
390	posta5.mediacenter.hu	70
391	mx01.1and1.es	70
392	cluster1.eu.messagelabs.com	70
393	posta3.mediacenter.hu	69
394	mx1.netim.net	69
395	mx2.netim.net	69
396	mx00.1and1.fr	69
397	mx01.1and1.fr	69
398	cluster1a.eu.messagelabs.com	69
399	mx3-dk.centerasecurity.dk	69
400	mx1.pub.mailpod11-cph3.one.com	68
401	mx3.pub.mailpod11-cph3.one.com	68
402	mx4.pub.mailpod11-cph3.one.com	68
403	mx.sendcloud.org	67
404	mail.mailerhost.net	67
405	mx2.pub.mailpod11-cph3.one.com	67
406	mx.aams4.jp	67
407	mail.h-email.net	67
408	mail.nominalia.com	67
409	mail.fwwgo.com	66
410	mx00.1and1.es	66
411	mxa.expediagroup.com	66
412	mxb.expediagroup.com	66
413	mail-fr.securemail.pro	66
414	mx1.tld-mx.com	65
415	q01es.mail.s-web.de	65
416	q02es.mail.s-web.de	65
417	r01es.mail.s-web.de	65
418	r02es.mail.s-web.de	65
419	mx1-us.emailsecurity.app	64
420	mx2-us.emailsecurity.app	64
421	usa.mx1.mailanyone.net	64
422	mx-0.aams4.jp	63
423	mx-1.aams4.jp	63
424	usa.mx3.mailanyone.net	63
425	mail.mailroute.net	63
426	mailforward31.cloudns.net	62
427	mailforward32.cloudns.net	62
428	mx.emailarray.com	62
429	mx2.emailarray.com	62
430	mx4.emailowl.com	61
431	mx2.active24.com	61
432	usa.mx2.mx25.net	61
433	usa.mx4.mx25.net	61
434	mx.mymailwall.com	61
435	smtp11.witglobal.net	61
436	smtp21.witglobal.net	61
437	rmw-002.fmcity.com	60
438	mx1.active24.com	60
439	mx1.topsec.com	60
440	mx2.topsec.com	60
441	mx5.emailowl.com	59
442	mx-caprica.zoneedit.com	59
443	spamexpert01.host.bg	59
444	spamexpert02.host.bg	59
445	mxa-001a2001.gslb.pphosted.com	59
446	mxa-0028be01.gslb.pphosted.com	58
447	mx.spamfilter.io	58
448	mx6.emailowl.com	58
449	mx1.daouoffice.com	58
450	mxb-001a2001.gslb.pphosted.com	58
451	mxb-0028be01.gslb.pphosted.com	57
452	mx1.pub.mailpod14-cph3.one.com	57
453	mx2.pub.mailpod14-cph3.one.com	57
454	mx3.pub.mailpod14-cph3.one.com	57
455	mx4.pub.mailpod14-cph3.one.com	57
456	primary.yourfilter.nl	57
457	fallback.yourfilter.nl	57
458	cluster5.us.messagelabs.com	57
459	dk.mx1.mailanyone.net	57
460	dk.mx2.mx25.net	57
461	spamrelay.zxcs.nl	57
462	heracles.mxrouting.net	57
463	parkmail.dynadot.com	57
464	mx01.statens-it.dk	57
465	mx02.statens-it.dk	57
466	mx03.statens-it.dk	57
467	mx04.statens-it.dk	57
468	mx05.statens-it.dk	57
469	mx06.statens-it.dk	57
470	mx07.statens-it.dk	57
471	mx08.statens-it.dk	57
472	mx2.sg.aliyun.com	57
473	mail.scoots.email	56
474	antispam.tebilisim.com	56
475	cluster5a.us.messagelabs.com	56
476	dk.mx3.mailanyone.net	56
477	generalsmtp.disney.com	56
478	mx01.cbsolt.net	55
479	mx02.cbsolt.net	55
480	heracles-relay.mxrouting.net	55
481	mx2.daouoffice.com	55
482	mx1.sg.aliyun.com	55
483	webmail.terrawan.eu	55
484	mail-in.fruugo.net	55
485	mx3.mailhostbox.com	54
486	mx6.securemx.jp	54
487	mail2.no-ip.com	54
488	mx01.muumuu-mail.com	54
489	dk.mx4.mx25.net	54
490	mx1.hostinger.pk	54
491	mx01.glesys.se	54
492	d01es.mail.s-web.de	54
493	d02es.mail.s-web.de	54
494	e01es.mail.s-web.de	54
495	e02es.mail.s-web.de	54
496	mta.vshosting.cloud	53
497	mail.mpcloud.net	53
498	cluster6.netcore.co.in	53
499	mx3.nameshield.com	53
500	mx4.nameshield.net	53
501	email.webglobe.cz	53
502	email2.webglobe.cz	53
503	mail14.bigcommerce.com	53
504	mx2.hostinger.pk	53
505	smtp.asia.secureserver.net	53
506	mailstore1.asia.secureserver.net	53
507	mx1.hostinger.com.ar	52
508	mta.vshosting.eu	52
509	smx00.udag.de	52
510	smx01.udag.de	52
511	mx1.netsolmail.net	52
512	mailgw01.host.it	51
513	mx1.simplelogin.co	51
514	mx2.simplelogin.co	51
515	mail2.recop.jp	51
516	mail1.no-ip.com	51
517	mx2.smtp.goog	51
518	mx3.smtp.goog	51
519	mx4.smtp.goog	51
520	adresseavisen.in.tmes.trendmicro.eu	51
521	mg.g-cloud.by	51
522	email3.webglobe.cz	51
523	email4.webglobe.cz	51
524	mx1.alwaysdata.com	51
525	mx2.alwaysdata.com	51
526	mx-mibc-fr-11.mailinblack.com	51
527	mailbe05.hoster.by	51
528	mx01.qboxmail.com	51
529	mx02.qboxmail.com	51
530	mx02.glesys.se	51
531	mx1.cloudhosting.uk	51
532	mx2.cloudhosting.uk	51
533	mailgw02.host.it	50
534	wednesday.mxrouting.net	50
535	cluster2.netcore.co.in	50
536	mx-n.global-mail.cn	50
537	mx1.smtp.goog	50
538	mxa-002a0701.gslb.pphosted.com	50
539	mxb-002a0701.gslb.pphosted.com	50
540	mxa-001a8401.gslb.pphosted.com	50
541	mxb-001a8401.gslb.pphosted.com	50
542	antispam.korea.kr	50
543	mail.idp365.net	50
544	mx1.nepal.gov.np	50
545	mars.intermailgate.com	50
546	mx2.hostinger.com.ar	49
547	mx1.oderland.com	49
548	mx2.oderland.com	49
549	wednesday-relay.mxrouting.net	49
550	cluster8.netcore.co.in	49
551	mx-1.mail.go.id	49
552	mx-3.mail.go.id	49
553	mx01.easyname.eu	49
554	mx02.easyname.eu	49
555	mx2.nepal.gov.np	49
556	p.webcom.ctmail.com	48
557	mail.bluetie.com	48
558	mx1.mailhostbox.com	48
559	mx2.mailhostbox.com	48
560	mail.pickelhost.com	48
561	mail.bayern.de	48
562	cluster3.netcore.co.in	48
563	mx-2.mail.go.id	48
564	mx-4.mail.go.id	48
565	mx1.webhouse.sk	47
566	mx2.webhouse.sk	47
567	mx3.webhouse.sk	47
568	fwd0.hosts.co.uk	47
569	mx.otenet.gr	47
570	cluster4.us.messagelabs.com	47
571	cluster4a.us.messagelabs.com	47
572	mail.vipmailservice.com	47
573	mxa-001bfb01.gslb.pphosted.com	47
574	mail.twincdn.com	47
575	mailgate01.itsfogo.com	47
576	mailgate02.itsfogo.com	47
577	mail02.mail-gw.de	47
578	mail03.mail-gw.de	47
579	mxpool.de2.hostedoffice.ag	46
580	vade-in1.mail.dreamhost.com	46
581	mx14a.antispameurope.com	46
582	mail.dms.unileverservices.com	46
583	primary.emea.email.fireeyecloud.com	46
584	alt1.emea.email.fireeyecloud.com	46
585	alt2.emea.email.fireeyecloud.com	46
586	alt3.emea.email.fireeyecloud.com	46
587	mxb-001bfb01.gslb.pphosted.com	46
588	fwd1.hosts.co.uk	46
589	fwd2.hosts.co.uk	46
590	mx3.oderland.com	45
591	mx4.oderland.com	45
592	mail.valtori.fi	45
593	mx1.bund.de	45
594	mx1.pub.mailpod9-cph3.one.com	44
595	mx2.pub.mailpod9-cph3.one.com	44
596	mx3.pub.mailpod9-cph3.one.com	44
597	mailbe03.hoster.by	44
598	mx0a-00292f01.pphosted.com	44
599	mx0b-00292f01.pphosted.com	44
600	glacier-relay.mxrouting.net	44
601	mx001.register.xion.oxcs.net	44
602	mx002.register.xion.oxcs.net	44
603	mx-cluster-ca03.hornetsecurity.com	44
604	mx.stable.cz	44
605	mxa-000e4101.gslb.pphosted.com	44
606	mxb-000e4101.gslb.pphosted.com	44
607	smtp.europe.secureserver.net	44
608	mailstore1.europe.secureserver.net	44
609	mx2.otenet.gr	44
610	mx2.bund.de	44
611	mx1.pub.mailpod12-cph3.one.com	44
612	mx2.pub.mailpod12-cph3.one.com	44
613	mx3.pub.mailpod12-cph3.one.com	44
614	mx4.pub.mailpod12-cph3.one.com	44
615	g01es.mail.s-web.de	44
616	g02es.mail.s-web.de	44
617	y01es.mail.s-web.de	43
618	y02es.mail.s-web.de	43
619	mx.noris.net	43
620	mxs.ht-systems.ru	43
621	cluster9.us.messagelabs.com	43
622	cluster9a.us.messagelabs.com	43
623	glacier.mxrouting.net	43
624	ni-spamexperts.guzel.net.tr	43
625	mail.univalence.com	43
626	mail1.correo.gob.es	43
627	mail2.correo.gob.es	43
628	mx4.otenet.gr	43
629	mx-cluster-ca02.hornetsecurity.com	43
630	mx-cluster-ca-fallback.hornetsecurity.com	43
631	vade-in2.mail.dreamhost.com	43
632	eu-esec-01.heimdalsecurity.com	43
633	eu-esec-02.heimdalsecurity.com	43
634	mxa-00292f01.gslb.pphosted.com	43
635	mxb-00292f01.gslb.pphosted.com	43
636	zc-mx.zohocorp.com	43
637	zc-mx2.zohocorp.com	43
638	zc-mx3.zohocorp.com	43
639	mail1.digikey.com	43
640	mail2.digikey.com	43
641	mail3.digikey.com	43
642	mail.lima-city.de	42
643	mail.parktons.com	42
644	mx1.pub.mailpod10-cph3.one.com	42
645	mx2.pub.mailpod10-cph3.one.com	42
646	mx1.emailowl.com	42
647	mailbe04.hoster.by	42
648	spam.cafe24.com	42
649	mx1-n.global-mail.cn	42
650	mx-cluster-ca01.hornetsecurity.com	42
651	mx.getcourse.ru	42
652	mx14b.antispameurope.com	42
653	mx14c.antispameurope.com	42
654	mx3.otenet.gr	42
655	mxa-0072c901.gslb.pphosted.com	42
656	mxb-0072c901.gslb.pphosted.com	42
657	mx4.pub.mailpod9-cph3.one.com	41
658	mx1.1984.is	41
659	mailer2.action.group	41
660	mailer3.action.group	41
661	mail3.scanscope.net	41
662	mx4.pub.mailpod10-cph3.one.com	41
663	mail1.scanscope.net	41
664	mx1.pokingbear.com	41
665	mail2.careerjet.net	41
666	smtp-in-internet-usr-m.gslb.srv.bnpparibas	41
667	mxa-006a4e02.gslb.pphosted.com	41
668	a1.spambusters.email	40
669	n1.spambusters.email	40
670	mx2.1984.is	40
671	mailer.action.group	40
672	cloudmail01.clausweb.ro	40
673	cloudmail02.clausweb.ro	40
674	cloudmail03.clausweb.ro	40
675	cloudmail04.clausweb.ro	40
676	mx2.emailowl.com	40
677	mx3.emailowl.com	40
678	mx1.mythic-beasts.com	40
679	mx2.mythic-beasts.com	40
680	mail2.scanscope.net	40
681	mx1.daemonmail.net	40
682	mx2.daemonmail.net	40
683	inbound.postmarkapp.com	40
684	mx2.postmaster.hu	40
685	mxb-006a4e02.gslb.pphosted.com	40
686	mx3.hh.ru	40
687	1-grid-mx01.co.za	39
688	mail.techsurgeons.com	39
689	mail4.makeshop.jp	39
690	mx1.loading.es	39
691	mx2.loading.es	39
692	mx3.loading.es	39
693	mx1.daringibex.com	39
694	mx1.dnsmadeeasy.com	39
695	mx2.dnsmadeeasy.com	39
696	cluster3.eu.messagelabs.com	39
697	mailgw.nic.in	39
698	primary.ap.email.fireeyecloud.com	39
699	mx1.hostinger.es	39
700	mx6.hh.ru	39
701	1-grid-mx02.com	38
702	1-grid-mx03.co.za	38
703	mx001.dclux.xion.oxcs.net	38
704	mx002.dclux.xion.oxcs.net	38
705	mx003.dclux.xion.oxcs.net	38
706	mx004.dclux.xion.oxcs.net	38
707	mx1.supremebox.com	38
708	mx2.supremebox.com	38
709	blizzard.mxrouting.net	38
710	smtp-scan01.mx.reflected.net	38
711	fakemx.noris.net	38
712	mx100.ucozmail.com	38
713	mxsecondaire.webmo.fr	38
714	mxs.armgs.team	38
715	mx3.dnsmadeeasy.com	38
716	mta01.scanscope.net	38
717	us1-smtp-mx1.titanhq.com	38
718	mx.stable.sk	38
719	mxa-00265f01.gslb.pphosted.com	38
720	mxb-00265f01.gslb.pphosted.com	38
721	mx0a-00190b01.pphosted.com	38
722	mx0b-00190b01.pphosted.com	38
723	mx1.uc-workd.com	38
724	mx2.uc-workd.com	38
725	inbound01.dynata.com	38
726	inbound02.dynata.com	38
727	inbound03.dynata.com	38
728	mxgw.bcc.gov.bd	38
729	mxmail.icoremail.net	38
730	alt2.ap.email.fireeyecloud.com	38
731	alt3.ap.email.fireeyecloud.com	38
732	mail-8.mtpserver.net	38
733	1-grid-mx04.com	37
734	mxwcom.263xmail.com	37
735	blizzard-relay.mxrouting.net	37
736	mx1.hostinger.fr	37
737	mx4.webhouse.sk	37
738	mx5.webhouse.sk	37
739	mx6.webhouse.sk	37
740	mmxs.majordomo.ru	37
741	mx-cluster-usa01.hornetsecurity.com	37
742	assur.rtl.de	37
743	marduk.rtl.de	37
744	sul.rtl.de	37
745	sulis.rtl.de	37
746	us1-smtp-mx2.titanhq.com	37
747	mx1.tmdhosting.com	37
748	mx2.tmdhosting.com	37
749	arrow.mxrouting.net	37
750	mx14d.antispameurope.com	37
751	taylor.mxrouting.net	37
752	smtp-avas-th.seeweb.it	37
753	tuesday-relay.mxrouting.net	37
754	mail-12.mtpserver.net	37
755	mail-13.mtpserver.net	37
756	mx2.pokerstars.com	37
757	mxcom.263xmail.com	36
758	mx.noris.de	36
759	shadow.mxrouting.net	36
760	mx1.pub.mailpod8-cph3.one.com	36
761	mx2.pub.mailpod8-cph3.one.com	36
762	mx3.pub.mailpod8-cph3.one.com	36
763	mx1.mas.t-systems-service.com	36
764	cluster3a.eu.messagelabs.com	36
765	mx1.mijndomein.nl	36
766	mx2.mijndomein.nl	36
767	mxa-00322602.gslb.pphosted.com	36
768	mxb-00322602.gslb.pphosted.com	36
769	mxa-002c9e02.gslb.pphosted.com	36
770	mxb-002c9e02.gslb.pphosted.com	36
771	mxa-00078002.gslb.pphosted.com	36
772	mxb-00078002.gslb.pphosted.com	36
773	mx.easymail.ca	36
774	mailforward3.cloudns.net	36
775	mx.emea.email.fireeyecloud.com	36
776	mx1.hostinger.co.id	36
777	pri-jeemsg.eemsg.mail.mil	36
778	sec-jeemsg.eemsg.mail.mil	36
779	mx01.ergonet.it	36
780	mx02.ergonet.it	36
781	mx03.ergonet.it	36
782	mx04.ergonet.it	36
783	alt1.ap.email.fireeyecloud.com	36
784	mail.makeup.com.ua	36
785	mxlbpu.ispgateway.de	36
786	tuesday.mxrouting.net	36
787	mail.nhs.uk	36
788	mx1.tigertech.net	35
789	mx2.tigertech.net	35
790	mx3.tigertech.net	35
791	mx2.hostinger.fr	35
792	mailfilter.hostnet.nl	35
793	mx1.mailpod13-cph3.g1i.hostnet.nl	35
794	mx2.mailpod13-cph3.g1i.hostnet.nl	35
795	mx3.mailpod13-cph3.g1i.hostnet.nl	35
796	mx4.mailpod13-cph3.g1i.hostnet.nl	35
797	mail.postale.io	35
798	mx.siteprotect.com	35
799	redirmail1.reg.bookmyname.com	35
800	redirmail2.reg.bookmyname.com	35
801	mx1c28.carrierzone.com	35
802	mail73.conoha.ne.jp	35
803	cluster4.eu.messagelabs.com	35
804	mx.renr.es	35
805	mx-dor.bell.ca	35
806	mx-wyn.bell.ca	35
807	mx1c25.carrierzone.com	35
808	mx2c25.carrierzone.com	35
809	mx3c25.carrierzone.com	35
810	mx4c25.carrierzone.com	35
811	mxa-001d1709.gslb.pphosted.com	35
812	mxb-001d1709.gslb.pphosted.com	35
813	mx.cstnet.cn	35
814	mailbox.wargaming.net	35
815	smtp2.delti.com	34
816	securemail-mx1.synaq.com	34
817	mx-cluster-usa02.hornetsecurity.com	34
818	mx-cluster-usa03.hornetsecurity.com	34
819	mx2.mas.t-systems-service.com	34
820	mx3.mas.t-systems-service.com	34
821	securemx01.mailplug.com	34
822	securemx02.mailplug.com	34
823	arrow-relay.mxrouting.net	34
824	cluster4a.eu.messagelabs.com	34
825	mx1.alibaba-inc.com	34
826	mxa-00657601.gslb.pphosted.com	34
827	mxb-00657601.gslb.pphosted.com	34
828	smtp.renault.fr	34
829	smtp2.renault.fr	34
830	mx2c51.megamailservers.eu	34
831	reply.s12.exacttarget.com	34
832	mail11.hmail.sg	33
833	mail21.hmail.sg	33
834	securemail-mx2.synaq.com	33
835	shadow-relay.mxrouting.net	33
836	cnc.biz-email.net	33
837	mail.gigaserver.cz	33
838	mx-cluster-usa04.hornetsecurity.com	33
839	echo.mxrouting.net	33
840	france.security-mail.net	33
841	europe.security-mail.net	33
842	mxa-002c5801.gslb.pphosted.com	33
843	smtp02.topdns.com	33
844	smtp03.topdns.com	33
845	smtp04.topdns.com	33
846	mforward.dtag.de	33
847	semail.sandhills.com	33
848	wemail.sandhills.com	33
849	mx.claramail.com.br	33
850	mx01.routing.net	33
851	mx03.routing.net	33
852	mxa-0058f001.gslb.pphosted.com	33
853	mxb-0058f001.gslb.pphosted.com	33
854	mx.ms.bi.zone	33
855	mail.swisscom.com	33
856	mail10.swisscom.com	33
857	mail20.swisscom.com	33
858	mxa-00254701.gslb.pphosted.com	33
859	mxb-00254701.gslb.pphosted.com	33
860	in.widestore.net	33
861	mxa-00177002.gslb.pphosted.com	33
862	mxb-00177002.gslb.pphosted.com	33
863	wmx.ecounterp.com	32
864	mx-a.secumail.de	32
865	mx-b.secumail.de	32
866	mail3.makeshop.jp	32
867	mxa-00505701.gslb.pphosted.com	32
868	mxb-00505701.gslb.pphosted.com	32
869	msg-a85.education.gouv.fr	32
870	msg-b85.education.gouv.fr	32
871	mx1.nz.smxemail.com	32
872	cloud15.spamtitan.com	32
873	echo-relay.mxrouting.net	32
874	mxa-00069f01.gslb.pphosted.com	32
875	mxb-00069f01.gslb.pphosted.com	32
876	mxb-002c5801.gslb.pphosted.com	32
877	inmx.rambler-co.ru	32
878	mail.voxops.net	32
879	mx.serveriai.lt	32
880	mail.joker.com	32
881	mx1.us.opalstack.com	32
882	mx2.us.opalstack.com	32
883	mxbackup.wnpower.com	32
884	mx-mibc-fr-06.mailinblack.com	32
885	mx2.hostinger.co.id	32
886	mx02.routing.net	32
887	aspmx1.dooray.com	32
888	ssl.emailserver.vn	32
889	dmeas13.imail.scig.gov.hk	32
890	dmeas14.imail.scig.gov.hk	32
891	pmeas13.imail.scig.gov.hk	32
892	pmeas14.imail.scig.gov.hk	32
893	fusion.mxrouting.net	31
894	fusion-relay.mxrouting.net	31
895	mail-s30.1gb.ru	31
896	us1.workspace.org	31
897	mail.biz-email.net	31
898	ecwebmail-002.cafe24.com	31
899	mx2c40.carrierzone.com	31
900	mx3c40.carrierzone.com	31
901	mx01.agnat.pl	31
902	mx-waw.grupawp.pl	31
903	mx-gda.grupawp.pl	31
904	cloud16.spamtitan.com	31
905	mxs.activeby.net	31
906	mailbe01.hoster.by	31
907	eagle.mxlogin.com	31
908	mx.mailo.com	31
909	taylor-relay.mxrouting.net	31
910	gatekeeper.space.net	31
911	gatekeeper.spacenet.de	31
912	mx2.hostinger.es	31
913	mail.svethostingu.cz	31
914	mxc.global-mail.cn	31
915	aws-useast1-mail.mars-inc.com	31
916	relay.exohosting.sk	31
917	mail.cm.telia.net	31
918	mail.dyson.cloud	31
919	mx.fimn.net	30
920	mx-ha.emailemnuvem.com.br	30
921	mx-mibc-fr-08.mailinblack.com	30
922	mx0.mail7.freehost.com.ua	30
923	mx1.mail7.freehost.com.ua	30
924	mx2.mail7.freehost.com.ua	30
925	mx01.espmailservice.net	30
926	mx-10.au-east.atmailcloud.com	30
927	mx-20.au-east.atmailcloud.com	30
928	mx1c40.carrierzone.com	30
929	mxa-00102601.gslb.pphosted.com	30
930	mxb-00102601.gslb.pphosted.com	30
931	mx01.tophost.ch	30
932	mxin1.airnet.ne.jp	30
933	mxin2.airnet.ne.jp	30
934	mx-mibc-fr-07.mailinblack.com	30
935	www4.your-server.de	30
936	mx-vip-02-farm64.kinghost.net	30
937	mx-vip-01-farm64.kinghost.net	30
938	mx1.dfw.automattic.com	30
939	mx1.mailpod15-cph3.g1i.one.com	30
940	mx2.mailpod15-cph3.g1i.one.com	30
941	mx3.mailpod15-cph3.g1i.one.com	30
942	mx4.mailpod15-cph3.g1i.one.com	30
943	mail.cmposta.com	30
944	mt-spamexperts.guzel.net.tr	30
945	mx2.mailhop.org	30
946	mx10.vwgroup.com	30
947	mx10.websupport.se	30
948	mxu.global-mail.cn	30
949	mailasp.sovcombank.ru	30
950	mx.x.recruit.co.jp	29
951	smx2.web-hosting.com	29
952	cloud11.spamtitan.com	29
953	je-smtp-inbound-1.mimecast-offshore.com	29
954	je-smtp-inbound-2.mimecast-offshore.com	29
955	mx3.34sp.com	29
956	mx4.34sp.com	29
957	pixel.mxrouting.net	29
958	mx2.nz.smxemail.com	29
959	mx.buzondecorreo.com	29
960	alt1.mymailcheap.com	29
961	mxa-001f3604.gslb.pphosted.com	29
962	mx1.trustytapir.com	29
963	mxus1.alibaba-inc.com	29
964	ezsmtp.bizmeka.com	29
965	fimad.interieur.gouv.fr	29
966	mx2.ams.automattic.com	29
967	mx16a.antispameurope.com	29
968	mx16b.antispameurope.com	29
969	mx16c.antispameurope.com	29
970	mx0.netangels.ru	29
971	mx1.netangels.ru	29
972	mx.online.net	29
973	spamgw.blueweb.co.kr	29
974	mxa-0028a403.gslb.pphosted.com	29
975	mxb-0028a403.gslb.pphosted.com	29
976	mmx.mail.gov.az	29
977	mail.variomedia.de	29
978	rmx.mailgw.jp	29
979	mx20.websupport.se	29
980	mx1.savana.cz	29
981	mx2.savana.cz	29
982	mx1.paypalcorp.com	29
983	mx01.ntc.net.pk	29
984	mxa-007b4402.gslb.pphosted.com	29
985	mxb-007b4402.gslb.pphosted.com	29
986	mail-relay.wetteronline.de	29
987	mx-mibc-fr-10.mailinblack.com	28
988	mg1.g-cloud.by	28
989	mail.sidecloud.cc	28
990	mailx.hoster.ru	28
991	ntvirus.url.com.tw	28
992	ntvirus2.url.com.tw	28
993	alt2.mymailcheap.com	28
994	tarbaby.junkemailfilter.com	28
995	mx02.tophost.ch	28
996	eagle-relay.mxlogin.com	28
997	mx1.heinlein-support.de	28
998	mx2.heinlein-support.de	28
999	mxb-0020eb02.gslb.pphosted.com	28
1000	mxc.ptempresas.pt	28

100 curiosities — singleton hostnames

Hostnames that appear exactly once in the Tranco top-1M (count == 1), sorted by length descending. These are the most bespoke / unusual setups — long custom names, region-specific hosters, one-off corporate gateways. Useful for qualitative research.

#	MX target (rare singleton)
1	portaldaindustria-com-br.mail.protection.outlook.com.portaldaindustria.com.br
2	\234\176\128\235\179\180\236\158\144\236\178\180\237\151\152\235\139\168.com
3	xn----7sbabhcekjz6cr0arjfb0n.xn--p1ai.xn----7sbabhcekjz6cr0arjfb0n.xn--p1ai
4	port-arthur-historic-site-management-authority-mx1.firstcloudsecurity.net
5	port-arthur-historic-site-management-authority-mx2.firstcloudsecurity.net
6	invictusgames-org.mail.protection.outlook.com.invictusgamesfoundation.org
7	mail.futureskillelearningplatform.com.futureskillelearningplatform.com
8	d138905b.ess.barracudanetworks.com.d138905b.ess.barracudanetworks.com
9	berlininstitut-org01e.mail.protection.outlook.com.berlin-institut.org
10	mx2.privateemail.com.admiral-xxx.com.admiral-xxx.com.admiral-xxx.com
11	hoteleamsterdam-net.mail.protection.outlook.com.hoteleamsterdam.net
12	escambiaschools-org.mail.protection.outlook.com.escambiaschools.org
13	c6fe0520d2e4d5f14a8540b8795bf44aea513d3b.msv1.invalid.oauife.edu.ng
14	_dc-mx.b2c2ea62bc1e.xn--niedlichfranzsischebulldoggenwelpen-0qd.de
15	aisinchemin.com.e0100.g0003.sg0090.im.emailsecurity.trendmicro.com
16	aisinchemin.com.e0100.g0003.pg0090.im.emailsecurity.trendmicro.com
17	aisinchemin.com.e0100.g0003.ng0090.im.emailsecurity.trendmicro.com
18	8015636d2855b80a32f403c362e2407d3aeb5f87.msv1.invalid.safra.com.br
19	c92430c7c769d08c37afbd66918e0d502b19cb73.msv1.invalid.uzhnu.edu.ua
20	cubic-transportation-systems-australia-mx1.firstcloudsecurity.net
21	4338ddf8c1abd91bbc9aa35b22d143f988a74ff9.msv1.invalid.usco.edu.co
22	mail.law-firm-rechtsanwalt-sattler-schanda-vienna-wien-austria.at
23	60d2ce94ea7b8a19c798a30bffc503512c2edd74.msv1.invalid.hanu.edu.vn
24	cubic-transportation-systems-australia-mx2.firstcloudsecurity.net
25	ce32ebd0cae4dc50c9e7901da398946e15c60469.msv1.invalid.maxlevel.ru

Show rows 26 – 100

#	MX target (rare singleton)
26	os-mj5j-8rjku-xx5tb-y8q4w-56fmf-8hq6r.in.tmes-anz.trendmicro.com
27	ec2-54-77-16-191.eu-west-1.compute.amazonaws.com.yougotagift.com
28	onesourcedocs-com.mail.protection.outlook.com.onesourcedocs.com
29	caribbeanjobs-com.mail.protection.outlook.com.caribbeanjobs.com
30	citycarclub-co-uk.mail.protection.outlook.com.citycarclub.co.uk
31	melbourneinternationalcomedyfestival.in.tmes-anz.trendmicro.com
32	adaptlinkbr-com-br.mail.protection.outlook.com.adaptlink.com.br
33	mercedesbenz-nl02b.mail.protection.outlook.com.mercedes-benz.nl
34	f2bb9d641e257c2959bb2f243df0405cb34a3fcb.msv1.invalid.wuerth.by
35	nlg-nhs-uk.mail.protection.outlook.com.disabled-dangler-101225
36	3fe4496ae8a42934b6eb0e3c668bcbdb0417b98c.msv1.invalid.dante.cz
37	mx-01-eu-central-1.prod.hydra.sophos.com.marathondessables.com
38	mx-02-eu-central-1.prod.hydra.sophos.com.marathondessables.com
39	manak-waste-management-private-ltd-mx2.firstcloudsecurity.net
40	_dc-mx.a20588229fc3.xn--h-k9tybb8g5ivhkczry701afhpm4sru6d.net
41	manak-waste-management-private-ltd-mx1.firstcloudsecurity.net
42	adf1e3594c114803ddb75b4b1a6dcffd2efd561f.msv1.invalid.rti.com
43	darpagcchigh-mail-onmicrosoft-us.mail.protection.office365.us
44	2c79dd459a09d1b8dd2384c562f213b4e6f45cd8.msv1.invalid.1hmm.ru
45	learnamatrol-com.mail.protection.outlook.com.learnamatrol.com
46	vade-mx-eu-fallback01.hornetsecurity.com.francecompetences.fr
47	vade-mx-eu-fallback02.hornetsecurity.com.francecompetences.fr
48	inbound-smtp.us-east-1.amazonaws.com.outfrontmediadigital.com
49	nm-yu2m-xmeax-gfj3n-lcygg-slrll-n58nq.in.tmes.trendmicro.com
50	d9a0b795a9ffa242b7f8d626f5a4d6.msv1.invalid.earthcharter.org
51	northlink-co-za.mail.protection.outlook.com.northlink.co.za
52	p3plzcpnl502916.prod.phx3.secureserver.net.eco-reglalos.com
53	autohub-co-za01b.mail.protection.outlook.com.auto-hub.co.za
54	df-nu4a-g8rhv-jl689-g9c89-ruukm-t7dhr.in.tmes.trendmicro.eu
55	_dc-mx.d84bab6894a2.xn--entzckendescferhundwelpen-wec35d.de
56	origin-203f71657c2dc5fa22dd0762fea06293.thechronicle.com.gh
57	mx1.123-regmmailsec.protonmail.chailsec.protonmail.ch.co.uk
58	_dc-mx.61bfeac23bdf.remont-kamer-videonablyudeniya-depot.ru
59	sierranevada-es.mail.protection.outlook.com.sierranevada.es
60	0f2532e9-ffe2-4f18-992f-bc109b59ed59.in.tmes.trendmicro.com
61	gruposaofrancisco.in.tmes.trendmicro.com.hapvidagndi.com.br
62	ca27446f-a9cd-4a06-b2eb-b0ab554cad47.in.tmes.trendmicro.com
63	yieldplanet-com.mail.protection.outlook.com.yieldplanet.com
64	khsbberlin-de01b.mail.protection.outlook.com.khsb-berlin.de
65	feedback-smtp.ap-southeast-2.amazonses.com.industry.gov.au
66	manulifesinochem-com02b.mail.protection.partner.outlook.cn
67	_dc-mx.1fa52635d9bf.xn--80aaademhwo0czaihgp8c1exb.xn--p1ai
68	discovery-com.mail.protection.outlook.com.animalplanet.com
69	knowbe4-site-verification=34b9a58212e47bbcdf835890f6facdda
70	8ad2f72d-b2c4-4426-93fd-baacf7213b2d.in.tmes.trendmicro.eu
71	rogerscorp-com.mail.protection.outlook.com.rogers-corp.com
72	_dc-mx.f0a4533b39a0.remont-posudomoechnyh-mashin-velox.ru
73	_dc-mx.bf2cf721d8de.masterinbusinessadministration.com.my
74	inbound-smtp.us-east-1.amazonaws.com.tribunaonline.com.br
75	_dc-mx.b62c75d272e5.stthomasusvirginislandsrealestate.com
76	europeanchamber-com-cn.mail.protection.partner.outlook.cn
77	inbound-smtp.us-east-1.amazonaws.com.velocidadcuchara.com
78	feedback-smtp.eu-central-1.amazonses.com.gruppoveritas.it
79	gpsmail.truckscontrol.com.br.newrastreamentoonline.com.br
80	_dc-mx.8d2433fd2609.water-filters-purifiers-softeners.com
81	mailstore1.secureserver.net.healthcaredesignmagazine.com
82	audifawnev-com-cn01bb.mail.protection.partner.outlook.cn
83	_dc-mx.ed78239552c9.xn--12c4baqad8cidv0ga2c0bl8o5cuh.com
84	canaancreative-com01e.mail.protection.partner.outlook.cn
85	printondemand-worldwide.com.pri-mx.uk0101.smtproutes.com
86	neusoftmedical-com01i.mail.protection.partner.outlook.cn
87	vade-mx-eu-fallback02.hornetsecurity.com.centre-inffo.fr
88	lb-sensproxy-2213375-dc68d533ade4.kr-gov.lb.naverncp.com
89	nfi34bdspmurbud57axm3w3xj2oyegddbnn6576ooea2jqnvu2mq.mx-
90	accenturefederaldefense-com.mail.protection.office365.us
91	leidseschouwburgstadsgehoorzaal-nl04b.c-v1.mx.microsoft
92	_dc-mx.22ae54f44b12.behavioralcentersofsouthflorida.com
93	etpr3nvk46n27vcc4juimkc7lxqosohb2zurr75mhylme5ye3awa.mx
94	inbound-smtp.us-west-2.amazonaws.com.tesseracttheme.com
95	q2ygyc7rtm35stmp3vy5ur6otcpe2wvg43tcgxnhvwrq.aun.edu.ng
96	sunlive-co-nz.mail.protection.outlook.com.sunlive.co.nz
97	australianmedicalassociation.in.tmes-anz.trendmicro.com
98	mxext3.mailbox.org.verbraucherzentrale-niedersachsen.de
99	porschepreview-cn01i.mail.protection.partner.outlook.cn
100	inbound-smtp.us-east-1.amazonaws.com.censusreporter.org

TLD breakdown of Unknown bucket

Where the unmatched domains live, by registry suffix. Two-level TLDs like co.uk and com.br are recognised.

#	TLD	Domains in Unknown bucket
1	com	123 597
2	net	21 656
3	ru	16 870
4	de	15 818
5	org	12 337
6	com.br	5 991
7	pl	5 317
8	it	5 162
9	jp	4 973
10	co.uk	4 227
11	fr	3 914
12	nl	3 821
13	in	3 379
14	top	2 919
15	cz	2 749

Methodology in 30 seconds

Source: daily OpenINTEL Tranco snapshot (forward DNS, top-1M).
"Unknown / Generic": domains whose primary MX hostname does not match any entry in dictionaries/mx_providers.py (named providers) or generic mail.* / mx*.* patterns we attribute to "Generic / Self-hosted".
Self-hosted: the primary MX equals the apex domain or is a subdomain of it (example.com → mx.example.com).
Curiosities: hostnames with exactly one observation in the snapshot, sorted by length descending. Deterministic — same snapshot ⇒ same list.
Reproducibility: all CSVs are downloadable verbatim. No proprietary enrichment.

Generated automatically from OpenINTEL Tranco snapshot 2026-04-27. Aggregates only — raw data is deleted after analysis per the OpenINTEL data agreement.