Long-tail of email infrastructure — 2026-09-13

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

At a glance

Unknown / Generic11.23%74 684 domainsUnique unmatched MX35 817individual hostnamesSelf-hosted22.38%148 813 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	mail.levikof.com	963
2	localhost	404
3	mail	239
4	mail.pickelhost.com	193
5	mail.parktons.com	171
6	mail1.sbnation.com	165
7	ms06.cv-library.co.uk	144
8	ms07.cv-library.co.uk	144
9	ms08.cv-library.co.uk	144
10	alltheemails.com	142
11	mail2.recop.jp	140
12	mx.email-messaging.com	135
13	ns4.forevermail.com	133
14	lbmx.bcc.gov.bd	130
15	s.mail.dcsaas.net	126
16	mail.autoline.com.ua	117
17	mx2.z-ns.net	116
18	mxi.alpha-prm.jp	115
19	mx1d10.thinline.cz	115
20	mx1b20.thinline.cz	115
21	entrap-01.hostns.io	113
22	entrap-02.hostns.io	113
23	entrap-03.hostns.io	113
24	mx1.ticketsinbound.com	102
25	mx2.ticketsinbound.com	99
26	mail.mpcloud.net	98
27	~	97
28	mx-backup.serveriai.lt	92
29	mx.maxns.net	91
30	mx2.netim.net	90
31	mx1.netim.net	89
32	mx.aams4.jp	89
33	mail-fr.securemail.pro	89
34	townsites.dnsmaster.net	88
35	mx-0.aams4.jp	86
36	mx-1.aams4.jp	86
37	amazon-smtp.amazon.com	85
38	cloudmail.auto-vision.ru	82
39	mailgw01.host.it	82
40	mail.vipmailservice.com	81
41	mx.vshosting.eu	81
42	mailforward.dnsv.jp	80
43	mailgw02.host.it	80
44	mx-01.mail-forwarder.io	79
45	mx-02.mail-forwarder.io	77
46	mx1-dk.centerasecurity.dk	75
47	mx2-dk.centerasecurity.dk	75
48	mx1.email-cluster.com	75
49	mx2.email-cluster.com	75
50	failover1.email-cluster.com	73

Show rows 51 – 1000

#	MX target	Domains
51	mx6.kvnbw.de	73
52	mx7.kvnbw.de	73
53	mx8.kvnbw.de	73
54	mx9.kvnbw.de	73
55	email.webglobe.cz	71
56	email2.webglobe.cz	71
57	posta.mediacenter.hu	70
58	posta2.mediacenter.hu	70
59	posta4.mediacenter.hu	70
60	posta5.mediacenter.hu	70
61	email3.webglobe.cz	70
62	email4.webglobe.cz	70
63	q01es.mail.s-web.de	70
64	q02es.mail.s-web.de	70
65	r01es.mail.s-web.de	70
66	r02es.mail.s-web.de	70
67	posta3.mediacenter.hu	69
68	mx3-dk.centerasecurity.dk	69
69	mail.global.frontbridge.com	69
70	mail.bluetie.com	67
71	mx1.oderland.com	67
72	mx2.oderland.com	67
73	mx01.muumuu-mail.com	67
74	mxa.expediagroup.com	66
75	mxb.expediagroup.com	66
76	gmail22.gadmail.de	66
77	gmail23.gadmail.de	66
78	wmail22.gadmail.de	66
79	mx.sendcloud.org	65
80	wmail23.gadmail.de	65
81	mx4.emailowl.com	64
82	mta.vshosting.eu	63
83	mx1.nepal.gov.np	63
84	mx3.oderland.com	62
85	mx4.oderland.com	62
86	mx.spamfilter.io	62
87	mx5.emailowl.com	62
88	smtp-avas.seeweb.it	62
89	mx4.nameshield.net	62
90	mx01.statens-it.dk	62
91	mx02.statens-it.dk	62
92	mx03.statens-it.dk	62
93	mx04.statens-it.dk	62
94	mx05.statens-it.dk	62
95	mx06.statens-it.dk	62
96	mx07.statens-it.dk	62
97	mx08.statens-it.dk	62
98	rmail22.gadmail.de	62
99	rmail23.gadmail.de	62
100	mx2.nepal.gov.np	62
101	smtp.faisco.cn	61
102	mx6.emailowl.com	61
103	mx1.daouoffice.com	61
104	mx1.alwaysdata.com	61
105	mx2.alwaysdata.com	61
106	mx1.mgn.net	61
107	omail22.gadmail.de	61
108	omail23.gadmail.de	61
109	d01es.mail.s-web.de	61
110	d02es.mail.s-web.de	61
111	e01es.mail.s-web.de	61
112	e02es.mail.s-web.de	61
113	mx1.simplelogin.co	60
114	mx2.simplelogin.co	60
115	mx2.mgn.net	60
116	mx3.mgn.net	60
117	antispam.tebilisim.com	59
118	void.blackhole.mx	59
119	generalsmtp.disney.com	56
120	mx.mymailwall.com	55
121	mxwcom.263xmail.com	54
122	c1.liara.email	54
123	mx01.cbsolt.net	54
124	mx02.cbsolt.net	54
125	mx2.daouoffice.com	54
126	mx-mibc-fr-11.mailinblack.com	54
127	spamexpert01.host.bg	54
128	spamexpert02.host.bg	54
129	mxcom.263xmail.com	53
130	antispam.korea.kr	53
131	cloudmail01.clausweb.ro	51
132	cloudmail02.clausweb.ro	51
133	cloudmail03.clausweb.ro	51
134	cloudmail04.clausweb.ro	51
135	mx-n.global-mail.cn	51
136	mx-1.mail.go.id	51
137	mx-2.mail.go.id	51
138	mx1.netsolmail.net	51
139	g01es.mail.s-web.de	51
140	g02es.mail.s-web.de	51
141	z01es.mail.s-web.de	51
142	z02es.mail.s-web.de	51
143	p.webcom.ctmail.com	50
144	mx-3.mail.go.id	50
145	mx-4.mail.go.id	50
146	adresseavisen.in.tmes.trendmicro.eu	50
147	mx01.easyname.eu	50
148	mx02.easyname.eu	50
149	mx20.active24.cz	49
150	mx1.mythic-beasts.com	49
151	mx2.mythic-beasts.com	49
152	mx.otenet.gr	49
153	mx2.mijndomein.nl	49
154	mx01.glesys.se	49
155	mrelay2.axa.com	49
156	mail.twincdn.com	49
157	mail.mailhub.work	48
158	mx10.active24.cz	48
159	mail1.no-ip.com	48
160	mail2.no-ip.com	48
161	mx1.loading.es	48
162	mx2.loading.es	48
163	mx3.loading.es	48
164	mx1.mijndomein.nl	48
165	mx2.postmaster.hu	48
166	mx1.pokingbear.com	48
167	mail.univalence.com	48
168	mxc.global-mail.cn	48
169	mx1.daringibex.com	47
170	smtp-scan01.mx.reflected.net	47
171	a1.spambusters.email	47
172	n1.spambusters.email	47
173	mail02.mail-gw.de	47
174	mail03.mail-gw.de	47
175	mxu.global-mail.cn	47
176	mail.gigaserver.cz	46
177	ni-spamexperts.guzel.net.tr	46
178	mx4.otenet.gr	46
179	mx2.otenet.gr	46
180	mx1.bund.de	46
181	mail.idp365.net	45
182	mx2.bund.de	45
183	y01es.mail.s-web.de	44
184	y02es.mail.s-web.de	44
185	mx1.krystal.io	44
186	mx2.krystal.io	44
187	mx.stable.cz	44
188	semail.sandhills.com	44
189	wemail.sandhills.com	44
190	mx3.otenet.gr	44
191	mx2c51.megamailservers.eu	44
192	mail1.digikey.com	44
193	mail2.digikey.com	44
194	mail3.digikey.com	44
195	mx1-n.global-mail.cn	43
196	mx02.glesys.se	43
197	mx01.ergonet.it	43
198	mx02.ergonet.it	43
199	mx03.ergonet.it	43
200	mx04.ergonet.it	43
201	mars.intermailgate.com	43
202	mx1.tigertech.net	42
203	mx2.tigertech.net	42
204	mx3.tigertech.net	42
205	mx1.supremebox.com	42
206	mx1.1984.is	42
207	mxpool.de2.hostedoffice.ag	42
208	relay.exohosting.sk	42
209	mx2.supremebox.com	41
210	mx2.1984.is	41
211	mail1.correo.gob.es	41
212	mail2.correo.gob.es	41
213	mx.noris.net	41
214	mx2.smtp.goog	41
215	mx3.smtp.goog	41
216	mx4.smtp.goog	41
217	mxs.ht-systems.ru	41
218	mx1.emailowl.com	40
219	mail.bayern.de	40
220	mx1.daemonmail.net	40
221	mx2.daemonmail.net	40
222	mx.stable.sk	40
223	mail.valtori.fi	40
224	mx2.us.opalstack.com	40
225	mx1.us.opalstack.com	40
226	smtp-in-internet-usr-m.gslb.srv.bnpparibas	40
227	mx1.smtp.goog	40
228	mail.variomedia.de	40
229	webmail3.terrawan.eu	40
230	mx01.tophost.ch	39
231	inbound.postmarkapp.com	39
232	relay3.dnsserver.eu	39
233	relay2.dnsserver.eu	39
234	mail-in.fruugo.net	39
235	mx.siteprotect.com	38
236	eu-esec-01.heimdalsecurity.com	38
237	eu-esec-02.heimdalsecurity.com	38
238	mx.easymail.ca	38
239	relay1.exohosting.sk	38
240	mx01.routing.net	38
241	mx03.routing.net	38
242	mx1.webhouse.sk	37
243	mx2.webhouse.sk	37
244	mx3.webhouse.sk	37
245	mx2.emailowl.com	37
246	mx3.emailowl.com	37
247	mxmail.icoremail.net	37
248	mx02.tophost.ch	37
249	mx1.friendfinder.com	37
250	mx2.friendfinder.com	37
251	mx3.friendfinder.com	37
252	mx-mibc-fr-06.mailinblack.com	37
253	mail.mizbanfalocal.com	37
254	mx02.routing.net	37
255	1-grid-mx02.com	36
256	1-grid-mx03.co.za	36
257	1-grid-mx01.co.za	36
258	fakemx.noris.net	36
259	france.security-mail.net	36
260	europe.security-mail.net	36
261	mg.g-cloud.by	36
262	mx.noris.de	36
263	mail.swisscom.com	36
264	mail10.swisscom.com	36
265	mail20.swisscom.com	36
266	mx10.websupport.se	36
267	pri-jeemsg.eemsg.mail.mil	36
268	sec-jeemsg.eemsg.mail.mil	36
269	mx.cstnet.cn	36
270	mx2.pokerstars.com	36
271	1-grid-mx04.com	35
272	mx1.maileroo.com	35
273	mx1.mailer91.com	35
274	mail3.makeshop.jp	35
275	mx100.ucozmail.com	35
276	mail4.makeshop.jp	35
277	mx.soverin.net	35
278	mx.zohocloud.ca	35
279	mxs.armgs.team	35
280	mail73.conoha.ne.jp	35
281	mx.renr.es	35
282	mx20.websupport.se	35
283	smtp-avas-th.seeweb.it	35
284	mx0002.neo.space	35
285	mx0001.neo.space	35
286	mail.nhs.uk	35
287	mx1.antispam-login.net	35
288	mx2.antispam-login.net	35
289	eu1-smtp-mx1.titanhq.com	34
290	mx2.mailer91.com	34
291	mail.techsurgeons.com	34
292	mx2.zohocloud.ca	34
293	mx3.zohocloud.ca	34
294	mt-spamexperts.guzel.net.tr	34
295	assur.rtl.de	34
296	marduk.rtl.de	34
297	sul.rtl.de	34
298	sulis.rtl.de	34
299	mmx.mail.gov.az	34
300	mx-mibc-fr-07.mailinblack.com	34
301	mail2.careerjet.net	34
302	mx.buzondecorreo.com	34
303	mx0.mail7.freehost.com.ua	34
304	mx1.mail7.freehost.com.ua	34
305	mx2.mail7.freehost.com.ua	34
306	mx01.shopmania.biz	34
307	mail.lakennetwork.com	34
308	zc-mx.zohocorp.com	34
309	zc-mx2.zohocorp.com	34
310	zc-mx3.zohocorp.com	34
311	mx2.maileroo.com	33
312	mx0.fortion.net	33
313	ntvirus.url.com.tw	33
314	ntvirus2.url.com.tw	33
315	mx-10.au-east.atmailcloud.com	33
316	mx-20.au-east.atmailcloud.com	33
317	mx1.mas.t-systems-service.com	33
318	mx1.nz.smxemail.com	33
319	mx1.dnsmadeeasy.com	33
320	mx2.dnsmadeeasy.com	33
321	mail2.filteredmx.net	33
322	mail-pt.securemail.pro	33
323	a2.spambusters.email	33
324	gatekeeper.space.net	33
325	mail-8.mtpserver.net	33
326	mail-12.mtpserver.net	33
327	mail-13.mtpserver.net	33
328	mailbox.wargaming.net	33
329	mx.x.recruit.co.jp	32
330	eu1-smtp-mx2.titanhq.com	32
331	mail.postale.io	32
332	mx1.fortion.net	32
333	email.imcloud.org	32
334	mx2.mas.t-systems-service.com	32
335	mx3.mas.t-systems-service.com	32
336	mail1.filteredmx.net	32
337	mail3.filteredmx.net	32
338	mxin1.airnet.ne.jp	32
339	mxin2.airnet.ne.jp	32
340	mx.getcourse.ru	32
341	inbound01.dynata.com	32
342	inbound02.dynata.com	32
343	inbound03.dynata.com	32
344	mail.cmposta.com	32
345	gatekeeper.spacenet.de	32
346	mx.ms.bi.zone	32
347	mx01.ntc.net.pk	32
348	mx2.fortion.net	31
349	cnc.biz-email.net	31
350	mx2.nz.smxemail.com	31
351	mail.websitefa.com	31
352	mx3.dnsmadeeasy.com	31
353	pmg.prodestek.com.tr	31
354	mxs.activeby.net	31
355	mx.zoho.jp	31
356	mx2.zoho.jp	31
357	mx3.zoho.jp	31
358	mforward.dtag.de	31
359	mx1.alibaba-inc.com	31
360	mxbackup.routing.net	31
361	mx1.fiercebadger.com	31
362	alt2-mx.rackhostmx.com	31
363	us1-smtp-mx1.titanhq.com	31
364	smtp.dvtech.io	31
365	mail.makeup.com.ua	31
366	mx.fimn.net	30
367	mx-mibc-fr-08.mailinblack.com	30
368	mail.mystoredns.com	30
369	mx.truemail.it	30
370	mx01.agnat.pl	30
371	mx.mailo.com	30
372	mail.joker.com	30
373	mx.claramail.com.br	30
374	email.cnhi.com	30
375	smtp.renault.fr	30
376	smtp2.renault.fr	30
377	mx1.ravingchamois.com	30
378	mailin100.dcpserver.de	30
379	mx10.vwgroup.com	30
380	aspmx1.dooray.com	30
381	sgc.hsplus.email	30
382	us1-smtp-mx2.titanhq.com	30
383	mail-relay.wetteronline.de	30
384	mg1.g-cloud.by	29
385	mail.biz-email.net	29
386	mmxs.majordomo.ru	29
387	mail1.ethionet.et	29
388	mail2.ethionet.et	29
389	mail3.ethionet.et	29
390	mail4.ethionet.et	29
391	mail2.mystoredns.com	29
392	inmx.rambler-co.ru	29
393	mx.serveriai.lt	29
394	mx1c51.megamailservers.com	29
395	mail.cm.telia.net	29
396	wmx.ecounterp.com	28
397	mx-mibc-fr-10.mailinblack.com	28
398	ssl.emailserver.vn	28
399	mx4.webhouse.sk	28
400	mx5.webhouse.sk	28
401	mx6.webhouse.sk	28
402	a.mx.mayfirst.org	28
403	b.mx.mayfirst.org	28
404	c.mx.mayfirst.org	28
405	mx-waw.grupawp.pl	28
406	mx-gda.grupawp.pl	28
407	eagle.mxlogin.com	28
408	mx1.earfulwolf.com	28
409	mx1.dfw.automattic.com	28
410	mx2.ams.automattic.com	28
411	mx3.34sp.com	28
412	reply.s12.exacttarget.com	28
413	mxpool.hostedoffice.ag	28
414	mx02.emailpnl.com	28
415	mx3c51.megamailservers.com	28
416	mail.med-vergleich.com	28
417	rmx.mailgw.jp	28
418	sgrmgw5.swatchgroup.com	28
419	sgrmgw6.swatchgroup.com	28
420	mx2.mailhop.org	28
421	mx1-mailcontrol.conova.com	28
422	mx2-mailcontrol.conova.com	28
423	mx3-mailcontrol.conova.com	28
424	mx4-mailcontrol.conova.com	28
425	mx1.dandomain.dk	28
426	dmeas13.imail.scig.gov.hk	28
427	dmeas14.imail.scig.gov.hk	28
428	pmeas13.imail.scig.gov.hk	28
429	pmeas14.imail.scig.gov.hk	28
430	corpmx.yelpcorp.com	28
431	mx.online.net	27
432	work-mx.app.hey.com	27
433	securemail-mx1.synaq.com	27
434	securemail-mx2.synaq.com	27
435	tarbaby.junkemailfilter.com	27
436	mx1.heinlein-support.de	27
437	mx2.heinlein-support.de	27
438	mgf.cybermail.jp	27
439	smtp1.lerelaisinternet.com	27
440	smtp2.lerelaisinternet.com	27
441	mx4.34sp.com	27
442	fimad.interieur.gouv.fr	27
443	mailgw.nic.in	27
444	mx01.emailpnl.com	27
445	mail.voxops.net	27
446	mx1.onlinemail.io	27
447	mx2.onlinemail.io	27
448	ign-mx1.webglobe.com	27
449	ign-mx2.webglobe.com	27
450	mx1.paypalcorp.com	27
451	mx2.dandomain.dk	27
452	mailasp.sovcombank.ru	27
453	mx0162.ppsmtp.com	27
454	mx0162.ppsmtp.de	27
455	mx-cache.online.net	26
456	smx2.web-hosting.com	26
457	us1.workspace.org	26
458	mx1.krystal.co.uk	26
459	mail.mailnode.cc	26
460	mx01.espmailservice.net	26
461	bounce.argewebhosting.nl	26
462	eagle-relay.mxlogin.com	26
463	mx01.mi.com.co	26
464	mxus1.alibaba-inc.com	26
465	mx1.savana.cz	26
466	mx2.savana.cz	26
467	inbound.mail.naiadsystems.com	26
468	mx-dor.bell.ca	26
469	mx-wyn.bell.ca	26
470	mx1.trustytapir.com	26
471	mx-ha.emailemnuvem.com.br	26
472	cloudscan24.ilger.com	26
473	mailgw3.oneoffice.jp	26
474	mxbackup.wnpower.com	26
475	mail.svethostingu.cz	26
476	mx2.paypalcorp.com	26
477	mx1.motosnap.com	26
478	mx2.motosnap.com	26
479	cr1.cylex.de	26
480	serwer1429664.home.pl	26
481	apache.mk.ru	26
482	smx3.web-hosting.com	25
483	mail.lima-city.de	25
484	mail-s30.1gb.ru	25
485	mx1.gigahost.dk	25
486	mx2.gigahost.dk	25
487	mx3.gigahost.dk	25
488	sns.nethost.sk	25
489	mx2.krystal.co.uk	25
490	mg.cybermail.jp	25
491	mx3.heinlein-support.de	25
492	smtp1-inki.e-i.net	25
493	smtp1-insi.e-i.net	25
494	mx6.eganet.go.tz	25
495	mx.turktelekomeposta.com	25
496	smtp.sarenet.es	25
497	mxf.eu.mpssec.net	25
498	mxg.eu.mpssec.net	25
499	mx01.rto.de	25
500	mxs.tbank.ru	25
501	mx03.puc.rediris.es	25
502	mx04.puc.rediris.es	25
503	ign-mx3.webglobe.com	25
504	ign-mx4.webglobe.com	25
505	mx2.spamfiltering.com	25
506	mx.shopmania.net	25
507	gateway.aos.rw	25
508	extern-gateway.innogames.de	25
509	mail.mojehobby.pl	25
510	mx.inbox.eu	24
511	mxfallback.spamfilterserver.com	24
512	mx.viettelidc.com.vn	24
513	mx1.efwd.spaceship.net	24
514	mx2.efwd.spaceship.net	24
515	mail01.be2.com	24
516	rk2.comju.de	24
517	mail.ssonet.nl	24
518	mail2.ssonet.nl	24
519	mx-aol.mail.gm0.yahoodns.net	24
520	gw-spam.mailwood.com	24
521	pmx.megacp.com	24
522	bmx.megacp.com	24
523	mgp.cybermail.jp	24
524	mx1.hostingcorreo.com	24
525	mx2.hostingcorreo.com	24
526	mx3.hostingcorreo.com	24
527	mx4.hostingcorreo.com	24
528	mx.mailbox.orange-business.com	24
529	fallback.axc.eu	24
530	cloudscan25.ilger.com	24
531	mx01.goneo.de	24
532	mx02.goneo.de	24
533	mx1.hostcreators.sk	24
534	mx2.hostcreators.sk	24
535	mx-mibc-fr-09.mailinblack.com	24
536	mx1.jimdo.com	24
537	mx2.jimdo.com	24
538	mail.hostalo.it	24
539	mx1.spamfiltering.com	24
540	mail.mycylex.de	24
541	mx001.fatsecret.com	24
542	mx.vps1.8com.cz	24
543	my-mx.email-protect.gosecure.net	23
544	smx1.web-hosting.com	23
545	mxbackup1.junkemailfilter.com	23
546	aspmx.whoisworks.com	23
547	mgk.cybermail.jp	23
548	mx1.de.opalstack.com	23
549	mx2.de.opalstack.com	23
550	mx-1.pobox.com	23
551	mx-2.pobox.com	23
552	mx-3.pobox.com	23
553	mx1.stsmail.ro	23
554	mx2.stsmail.ro	23
555	mailscanner01.zoner.fi	23
556	mailscanner02.zoner.fi	23
557	captmx-re20.bizflycloud.vn	23
558	captmx-re30.bizflycloud.vn	23
559	captmx-re40.bizflycloud.vn	23
560	smx.megacp.com	23
561	my.mailbux.com	23
562	allegro.in.tmes.trendmicro.eu	23
563	mx1.smashtic.com	23
564	mxbackup1.svrsh.com	23
565	mx-in.kommunale.it	23
566	mx4.eganet.go.tz	23
567	mail.101domain.com	23
568	mx-mibc-fr-05.mailinblack.com	23
569	mx4c51.megamailservers.eu	23
570	mail.wroclaw.sa.gov.pl	23
571	mail2.wroclaw.sa.gov.pl	23
572	mail3.wroclaw.sa.gov.pl	23
573	mail4.wroclaw.sa.gov.pl	23
574	parse.mailjet.com	23
575	mx.turkticaret.net	23
576	smtp1.osuosl.org	23
577	smtp2.osuosl.org	23
578	smtp3.osuosl.org	23
579	smtp4.osuosl.org	23
580	aws-useast1-mail.mars-inc.com	23
581	mx1.suremail.cn	23
582	mx2.suremail.cn	23
583	mx3.suremail.cn	23
584	mx4.suremail.cn	23
585	mx3.hh.ru	23
586	mx1.chengmail.cn	22
587	mx2.chengmail.cn	22
588	smtp-in0.prod0.webspace.bz	22
589	smtp-in1.prod0.webspace.bz	22
590	accor.in.tmes.trendmicro.eu	22
591	mx1.mail-scanner.eu	22
592	mx.c2.icoremail.net	22
593	mx.skok.cz	22
594	mxbackup.skok.cz	22
595	mx2.lite-host.su	22
596	mfwd.ebrandservices.com	22
597	mgc.cybermail.jp	22
598	ezsmtp.bizmeka.com	22
599	alt1.mymailcheap.com	22
600	mx1.email-hosting.net.au	22
601	mx2.email-hosting.net.au	22
602	mx3.email-hosting.net.au	22
603	mx4.email-hosting.net.au	22
604	m213-mail.server4u.cz	22
605	mx01.hosting.de	22
606	mx02.hosting.de	22
607	mx03.hosting.de	22
608	mxbackup.hosting.de	22
609	mxbackup2.svrsh.com	22
610	mx.sina.net	22
611	mail-in3.rian.ru	22
612	mail-in4.rian.ru	22
613	m103.server4u.cz	22
614	mx20.vwgroup.com	22
615	smartmail1.fednet.gov.ae	22
616	smartmail2.fednet.gov.ae	22
617	offline.iserv.eu	22
618	mxprimary.spamfilterserver.com	22
619	mx6.hh.ru	22
620	mx1.grn.es	22
621	mx2.grn.es	22
622	mx.spamorez.ru	21
623	mta.hosts.net.nz	21
624	mx1.vevida.com	21
625	mx2.vevida.com	21
626	mx3.vevida.com	21
627	alf1.aspmx.whoisworks.com	21
628	alf2.aspmx.whoisworks.com	21
629	mx.spamservice.nl	21
630	fallbackmx.spamservice.nl	21
631	lastmx.spamservice.nl	21
632	mx2.mail-scanner.eu	21
633	mx-a.secumail.de	21
634	mx-b.secumail.de	21
635	mx1.alastyr.com	21
636	mx01a.pp-tp.com	21
637	mx02a.pp-tp.com	21
638	mx1.mijn.host	21
639	mx2.mijn.host	21
640	rx1.sparkpostmail.com	21
641	rx2.sparkpostmail.com	21
642	rx3.sparkpostmail.com	21
643	mx.portsit.net	21
644	mx.portsit.se	21
645	mx.portsit.com	21
646	mail.forumhome.com	21
647	b1234.mx.srv.dfn.de	21
648	c1234.mx.srv.dfn.de	21
649	alt2.mymailcheap.com	21
650	dmeas11.imail.scig.gov.hk	21
651	dmeas12.imail.scig.gov.hk	21
652	pmeas11.imail.scig.gov.hk	21
653	pmeas12.imail.scig.gov.hk	21
654	mx1.spatiul.ro	21
655	mx2.spatiul.ro	21
656	mx3.spatiul.ro	21
657	mx4.spatiul.ro	21
658	s2vg300mr01.pzd-svn.de	21
659	s2vg300mr02.pzd-svn.de	21
660	mail.system.digitalartscloud.com	21
661	mail.anonaddy.me	21
662	mx1.mailhop.us	21
663	smtp.egcloud.gov.eg	21
664	mail.net4india.com	21
665	ge-smtp01.gammae.com	21
666	sv62.ifastnet11.org	20
667	mx4.vevida.com	20
668	backup-mx.vevida.com	20
669	mx2.alastyr.com	20
670	mx10.omc.net	20
671	mx01b.pp-tp.com	20
672	mx02b.pp-tp.com	20
673	gwmail.ktbizoffice.com	20
674	mx4.funlife.cz	20
675	pmg.guzel.net.tr	20
676	pmg2.guzel.net.tr	20
677	a1234.mx.srv.dfn.de	20
678	mail01.phoenixgroup.eu	20
679	mail02.phoenixgroup.eu	20
680	mail03.phoenixgroup.eu	20
681	mail04.phoenixgroup.eu	20
682	mx-in03b.natrohost.com	20
683	mx3.mailinghosting.com	20
684	mx1.em.dingtalk.com	20
685	mx2.em.dingtalk.com	20
686	mail.mbcore.io	20
687	blackhole.aftermarket.pl	20
688	mail.cco.in.ua	20
689	mxc.meoempresas.pt	20
690	mxp.meoempresas.pt	20
691	mx01.govmail.gov.jo	20
692	mx02.govmail.gov.jo	20
693	mail2.anonaddy.me	20
694	mxh.eu.mpssec.net	20
695	mxi.eu.mpssec.net	20
696	fortispam.cedia.org.ec	20
697	pochta.mtw.ru	20
698	emix.sdv.fr	20
699	ag1.cesnet.cz	20
700	ag2.cesnet.cz	20
701	mx-in04.natrohost.com	20
702	mx-in04b.natrohost.com	20
703	postrelay1.lrz.de	20
704	postrelay2.lrz.de	20
705	mx1.niagahoster.co.id	20
706	mx2.niagahoster.co.id	20
707	filter.premiumantispam.nl	20
708	fallback.premiumantispam.nl	20
709	friday.mxlogin.com	20
710	mx1.belwue.de	20
711	mx.hitcluster.com	20
712	mail.tehila.gov.il	20
713	mx01.earthlink-vadesecure.net	20
714	mx02.earthlink-vadesecure.net	20
715	mx03.earthlink-vadesecure.net	20
716	mx04.earthlink-vadesecure.net	20
717	in.widestore.net	20
718	mail.framasoft.org	20
719	mail.advameg.com	20
720	mx3.eganet.go.tz	20
721	mtab.intel.com	20
722	mx.eivoittoa.fi	20
723	mx.vk.com	20
724	mx-in-1.webreus.nl	19
725	mx-in-2.webreus.nl	19
726	mxbackup2.junkemailfilter.com	19
727	mx11.omcnet.de	19
728	mail2.greennet.org.uk	19
729	mx1.greenhost.nl	19
730	mx2.greenhost.nl	19
731	mail.academiadasapostas.com	19
732	hzmx02.xmail.ntesmail.com	19
733	mgw.gov.kz	19
734	reply.s50.exacttarget.com	19
735	mx-in03.natrohost.com	19
736	ch-mail-fx-001.funix.nl	19
737	of-mail-fx-001.funix.nl	19
738	mx3.em.dingtalk.com	19
739	smtp.tmgrup.com.tr	19
740	mailf.comsats.net.pk	19
741	avas.cloudemail.be	19
742	mail.mosby.com	19
743	mail1.rit.ee	19
744	mail3.rit.ee	19
745	mailstream-australia-primary.area1.cloudflare.net	19
746	mailgw2.spd.co.il	19
747	mx1.reg365.net	19
748	mx2.reg365.net	19
749	mx1.secure.ly	19
750	mx.fusemail.net	19
751	mx1.mailhop.co	19
752	mx1.mailhop.co.uk	19
753	cm2.99sync.com	19
754	mx01.ofis.net	19
755	mx1.progreso.pl	19
756	mx2.progreso.pl	19
757	mx3.progreso.pl	19
758	mx1.promail.com.tr	19
759	mx2.promail.com.tr	19
760	mail2.p24.hu	19
761	pop2.ocnk.net	19
762	smtp.sparkpostmail.com	19
763	mx-mibc-fr-03.mailinblack.com	19
764	mx2.freeola.com	19
765	mx3.freeola.com	19
766	mx4.freeola.com	19
767	mx5.freeola.com	19
768	rcmx3.roscongress.org	19
769	mailfilter.hibox.biz	19
770	mx.kpnmail.nl	18
771	antispam04.pensomail.com.br	18
772	mx1.nethely.hu	18
773	mx2.nethely.hu	18
774	mx76.antispam-post.ru	18
775	mx-4.pobox.com	18
776	mx-5.pobox.com	18
777	mail-in.protection.bpce-it.fr	18
778	mail.sidecloud.cc	18
779	mx11-new.vatican.va	18
780	mx12-new.vatican.va	18
781	mx20.vatican.va	18
782	mx21.vatican.va	18
783	hzmx01.xmail.ntesmail.com	18
784	mx1.a1.net	18
785	mr.pavietnam.vn	18
786	mx.noip.com	18
787	fm.telconet.net	18
788	mx3.daouoffice.com	18
789	avas-backup.cloudemail.be	18
790	mx-in02.natrohost.com	18
791	mx-in02b.natrohost.com	18
792	reply.s13.exacttarget.com	18
793	mailin-01.mx.sonic.net	18
794	mailin-02.mx.sonic.net	18
795	mdn.corp-email.cn	18
796	mx1.monarobase.net	18
797	mx2.monarobase.net	18
798	mrelay.axa.com	18
799	vip-mail.superhosting.cz	18
800	mx1.antispam-post.ru	18
801	rat-01.safaricombusiness.co.ke	18
802	inbound.registeredsite.com	18
803	mail18.lh.pl	18
804	mx0.mailinblack.com	18
805	mx3.netregistry.net	18
806	mx2.netregistry.net	18
807	mx.xmission.com	18
808	mx.usa.net	18
809	lobo.mercurio.cl	18
810	mail.reed.jp	18
811	mx02.ofis.net	18
812	mx20.profesionalhosting.com	18
813	mx02.mail.alibaba.com	18
814	mx4.belwue.de	18
815	mailgw.mts.rs	18
816	mailforward.iomart.com	18
817	mx0.lcn.com	18
818	mx1.lcn.com	18
819	mx01.windstream.net	18
820	mta.1stdomains.net.nz	18
821	mta5.am0.yahoodns.net	18
822	mta6.am0.yahoodns.net	18
823	mta7.am0.yahoodns.net	18
824	mx.dka.mailcore.net	18
825	mail03.gov.cy	18
826	spam.seoul.go.kr	18
827	spam2.seoul.go.kr	18
828	mail.lottery.ltd.uk	18
829	selmx5.roscongress.org	18
830	mx1.ex.360.cn	17
831	mx1.sparkspace.huaweicloud.com	17
832	mx2.sparkspace.huaweicloud.com	17
833	mx01.263xmail.com	17
834	webmail.mail.maxns.net	17
835	mx1.redhat.com	17
836	mx32.antispam-post.ru	17
837	forwarder.moddies.be	17
838	smtp-gate.gn.apc.org	17
839	mailx.hoster.ru	17
840	alt1.cloudcone.mx	17
841	alt2.cloudcone.mx	17
842	mx.mijnspamfilter.nl	17
843	mx.bpn.ge	17
844	mx03.mi.com.co	17
845	mail1.qlc.co.in	17
846	mail2.qlc.co.in	17
847	mail3.qlc.co.in	17
848	mdn.corpemail.net	17
849	mailstream-syd.area1.cloudflare.net	17
850	mail.cleanmail.eu	17
851	mx.yourpaysitepartner.com	17
852	mx2.secure.ly	17
853	mx3.secure.ly	17
854	mx4.secure.ly	17
855	mx2.tmdhosting.com	17
856	reply.s10.exacttarget.com	17
857	rat-02.safaricombusiness.co.ke	17
858	mx.nameweb.biz	17
859	mercure.credit-agricole.fr	17
860	mx.inet.vn	17
861	mxacloud02.imatrix.co.jp	17
862	mx-stp.mail.saunalahti.fi	17
863	mx-tnl.mail.saunalahti.fi	17
864	mail.schroederdennis.de	17
865	mx-in-hfd.apple.com	17
866	mx-in-vib.apple.com	17
867	mx-in1.euronic.fi	17
868	mx-in2.euronic.fi	17
869	mxbjm.chinaemail.cn	17
870	smtp1.speednames.com	17
871	smtp1.egcloud.gov.eg	17
872	mx22.gmoserver.jp	17
873	mx.ukrdomen.com	17
874	mx2.uh.com.ua	17
875	mx1.megamailservers.com	17
876	mxbackup01.ofis.net	17
877	mx1.flockmail.com	17
878	mx2.flockmail.com	17
879	mx10.profesionalhosting.com	17
880	smtp2.speednames.com	17
881	mx.junkemailfilter.net	17
882	mx.junkemailfilter.org	17
883	relay.mail.sec-provider.de	17
884	mail.amamultimedia.com	17
885	mx3.deem.sa	17
886	mx4.deem.sa	17
887	friday-relay.mxlogin.com	17
888	mail-relay-1.nethost.cz	17
889	mx01.mail.alibaba.com	17
890	mx2.belwue.de	17
891	mx3.belwue.de	17
892	mail.mymail.eu.com	17
893	bmx01.neodigit.net	17
894	bmx02.neodigit.net	17
895	mgy.cybermail.jp	17
896	mx.ilait.se	17
897	inbound-reply.s1.exacttarget.com	17
898	antispamawn.thaicloudsolutions.com	17
899	newsletter.cylex.de	17
900	mx1.bionicmoose.com	17
901	mx-in1001.wikimedia.org	17
902	mx-in2001.wikimedia.org	17
903	dns10977.phdns5.es	17
904	mx1.spamorez.ru	16
905	mx.latnet.lv	16
906	mx2.latnet.lv	16
907	mx1.mschosting.com	16
908	mx2.mschosting.com	16
909	ksmg01.picompany.ru	16
910	ksmg02.picompany.ru	16
911	mxc.ptempresas.pt	16
912	mailin2.mx.speedkom.net	16
913	mailin5.mx.speedkom.net	16
914	mx01mi.neen.it	16
915	mx02mi.neen.it	16
916	mx.inbound.elasticemail.com	16
917	primary.us.etp.fireeyegov.com	16
918	alt1.us.etp.fireeyegov.com	16
919	mx01.logixmx.com	16
920	mx02.logixmx.com	16
921	mx1.cloudaccess.net	16
922	mx2.cloudaccess.net	16
923	mail2.motorpresse.de	16
924	mx21.gmoserver.jp	16
925	mx1.zoner.fi	16
926	mx2.zoner.fi	16
927	mx2.bgdns.net	16
928	secmail.iap.socgen.com	16
929	lae-mx2.daybreakgames.com	16
930	mia1-load.supramail.com.br	16
931	mx1.tmdhosting.com	16
932	mailas02.clog.jp	16
933	mx0.spamfilter.gr	16
934	mx1.spamfilter.gr	16
935	mx.kpnqwest.it	16
936	mx2.kpnqwest.it	16
937	mx.c1.icoremail.net	16
938	mx-in.g.apple.com	16
939	mx-in-mdn.apple.com	16
940	mx1.mailhop.org	16
941	smtp01.wmaker.net	16
942	smtp02.wmaker.net	16
943	mailgw.mizbanfalocal.com	16
944	mail2.bytecamp.net	16
945	gcmx01.govkorea.kr	16
946	gcmx02.govkorea.kr	16
947	gcmx03.govkorea.kr	16
948	mx3.volusion.com	16
949	mx4.volusion.com	16
950	mx2.megamailservers.com	16
951	mx3.megamailservers.com	16
952	mail.casinocontroller.com	16
953	mx01.servicehoster.ch	16
954	mx02.servicehoster.ch	16
955	mail.fpack.jp	16
956	mailmx0001.rlp.de	16
957	mailmx0002.rlp.de	16
958	ofcsgbbm.gbbmvi-wan.de	16
959	zbcsgbbm.gbbmvi-wan.de	16
960	mx.junkemailfilter.com	16
961	mail-cc.maxcluster.net	16
962	mx2.deem.sa	16
963	mx1.deem.sa	16
964	mx02.dioezesennetz.de	16
965	mx01.dioezesennetz.de	16
966	dhl-com.fortimailcloud.com	16
967	m4.xrea.com	16
968	mailscanner.powerhosting.dk	16
969	mail.tubecj.com	16
970	mail2535230.us.to	16
971	ksmg.mail.rwb.ru	16
972	uk1-smtp-mx1.titanhq.com	16
973	uk1-smtp-mx2.titanhq.com	16
974	mail.dyson.cloud	16
975	mail.atw.hu	16
976	mail2.atw.hu	16
977	rtmx2.roscongress.org	16
978	mail.myonlineradio.hu	16
979	mx-ws.dca.untd.com	15
980	mx-ws.vgs.untd.com	15
981	smtp1.mafra.cz	15
982	smtp2.mafra.cz	15
983	smtp3.mafra.cz	15
984	smtp4.mafra.cz	15
985	smtp.webnames.ca	15
986	mx1.nine.ch	15
987	mx2.nine.ch	15
988	mail.messaging.microsoft.com	15
989	mail.endora.cz	15
990	spamschutz.webhoster.de	15
991	mfwd.eurodns.com	15
992	mail.mmmmmmmm.pw	15
993	eu1.workspace.org	15
994	us4-smtp-mx1.titanhq.com	15
995	us4-smtp-mx2.titanhq.com	15
996	mail1.bravehost.com	15
997	mail2.bravehost.com	15
998	smtp1.mailfence.com	15
999	smtp2.mailfence.com	15
1000	mx1.intermax.nl	15

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	nomcom-postfixnlb-primary-prd-9b67717506e5a5b8.elb.ap-northeast-1.amazonaws.com
2	a054cd5b956464acb8abb27a3c6bdd9a-85ac2eeef24e1085.elb.us-east-1.amazonaws.com
3	port-arthur-historic-site-management-authority-mx1.firstcloudsecurity.net
4	port-arthur-historic-site-management-authority-mx2.firstcloudsecurity.net
5	cubic-transportation-systems-australia-mx2.firstcloudsecurity.net
6	cubic-transportation-systems-australia-mx1.firstcloudsecurity.net
7	kumomta-inbound-nlb-a0dcfe14e184840a.elb.us-east-2.amazonaws.com
8	c376242079468b63f23f69becab45ae05b58a20e3873f77f83b2288f3647007
9	google-site-verification=ca3yqrdl5fgkylibg1wxi3ohafhe0tonkbvpzb
10	realf-applb-vrxtwmiuyvuv-2103991361.us-west-1.elb.amazonaws.com
11	manak-waste-management-private-ltd-mx2.firstcloudsecurity.net
12	manak-waste-management-private-ltd-mx1.firstcloudsecurity.net
13	remai-art-gallery-of-saskatchewan-mx2.firstcloudsecurity.net
14	55mth-mail-26b47d887ec242c7.elb.ap-northeast-1.amazonaws.com
15	remai-art-gallery-of-saskatchewan-mx1.firstcloudsecurity.net
16	mx1.123-regmmailsec.protonmail.chailsec.protonmail.ch.co.uk
17	scprd2-p1-aadd52a9a99424fb.elb.ap-northeast-1.amazonaws.com
18	emailserver-2e1b0065310ca62b.elb.ca-central-1.amazonaws.com
19	df-nu4a-g8rhv-jl689-g9c89-ruukm-t7dhr.in.tmes.trendmicro.eu
20	p3plzcpnl502916.prod.phx3.secureserver.net.eco-reglalos.com
21	manulifesinochem-com02b.mail.protection.partner.outlook.cn
22	8ad2f72d-b2c4-4426-93fd-baacf7213b2d.in.tmes.trendmicro.eu
23	knowbe4-site-verification=34b9a58212e47bbcdf835890f6facdda
24	_dc-mx.fc2dea773184.medicalteaching.org.cdn.cloudflare.net
25	europeanchamber-com-cn.mail.protection.partner.outlook.cn

Show rows 26 – 100

#	MX target (rare singleton)
26	neusoftmedical-com01i.mail.protection.partner.outlook.cn
27	printondemand-worldwide.com.pri-mx.uk0101.smtproutes.com
28	audifawnev-com-cn01bb.mail.protection.partner.outlook.cn
29	canaancreative-com01e.mail.protection.partner.outlook.cn
30	nfi34bdspmurbud57axm3w3xj2oyegddbnn6576ooea2jqnvu2mq.mx-
31	lb-sensproxy-2213375-dc68d533ade4.kr-gov.lb.naverncp.com
32	nospamcloudserver.germanywestcentral.cloudapp.azure.com
33	ec2-54-250-119-230.ap-northeast-1.compute.amazonaws.com
34	u003d1a3b487390464833982a65fae59682b8.pamx1.hotmail.com
35	etpr3nvk46n27vcc4juimkc7lxqosohb2zurr75mhylme5ye3awa.mx
36	porschepreview-cn01i.mail.protection.partner.outlook.cn
37	ec2-54-249-53-219.ap-northeast-1.compute.amazonaws.com
38	ec2-54-249-67-111.ap-northeast-1.compute.amazonaws.com
39	ipolaristech-com02b.mail.protection.partner.outlook.cn
40	zhengduindustry-com.mail.protection.partner.outlook.cn
41	ec2-54-249-80-136.ap-northeast-1.compute.amazonaws.com
42	mailserver-elb-2061444691.us-east-1.elb.amazonaws.com
43	b0ffb392998bbac22514f47efc669d776443e592.msv1.invalid
44	e1373a12bca10839245327b9929bbbb41f14a8b3.msv1.invalid
45	explorationpub-com.mail.protection.partner.outlook.cn
46	7544859033090d52a1be915fe96b1ec34f4dfd58.msv1.invalid
47	a65de67cec3cffe17a5ac1f81aa42b22b2bcc8bb.msv1.invalid
48	dd65647d11fb1053fa50107650b42fc91a436e09.msv1.invalid
49	52f27914d6785f1569d999124b030c5d757f88dc.msv1.invalid
50	398fee270f77f506c1cc48e3a278690a231969e0.msv1.invalid
51	b7d2174f2e1b3ef1065ffa8a05f24e3ca87487e4.msv1.invalid
52	7d647202e4a762b842051e7ec60ff2fbd7fa2867.msv1.invalid
53	638d21520d5d8632ca41f2350704980f00eee5ee.msv1.invalid
54	5630e8ec42dcf18d9f086f6c16eb2667db34ace6.msv1.invalid
55	0e52eafae7d1afa59efc92fe1a4ff3276f8eed08.msv1.invalid
56	d8ef932105e6cdcd8d95d568e0ceb61e012b76b4.msv1.invalid
57	7312c3dbeed587e1ca48d18b0132c7c7d3d449d0.msv1.invalid
58	0fcc78af48b44f7236938cb34abbc42e37e614bf.msv1.invalid
59	b9b6ae914169a5a1688b1ae10978544884baaeb2.msv1.invalid
60	279c75a743b1712505623de1926da99446f03967.msv1.invalid
61	e57689ebf1cee2dcc74ca9695ba1a35f5249a903.msv1.invalid
62	23a61b54849a99e548624c09d1cdddef7ffb2764.msv1.invalid
63	voipdnsservers-com.mail.protection.outlook.comook.com
64	8128664d7b9f7560c069c1bc8e6e2288e53721dc.msv1.invalid
65	8fca991f22bf0d3d9888adf9a9f177956ff29643.msv1.invalid
66	c37b41cc2aa83c50b8571a4fc41db855c664ecb8.msv1.invalid
67	f78862464ed0b6cbe472a0576b0fbb2ac6d05878.msv1.invalid
68	d3289eaaa594de2bf98e995630fdf76eb646bd67.msv1.invalid
69	st-leonards-medical-clinic-mx2.firstcloudsecurity.net
70	st-leonards-medical-clinic-mx1.firstcloudsecurity.net
71	4b21ca12bd08ff22911a3537cf16967c602f815c.msv1.invalid
72	f59062e299f55da9447ced93e0ca43a2524e3386.msv1.invalid
73	90567ad2edb4ac9680d76a5d4492522415dc356e.msv1.invalid
74	printondemand-worldwide.com.bak-mx.uk0101.smtpbak.com
75	be7c5e09a4d9047e88c98c8bdd5c0306855692b8.msv1.invalid
76	mercedesbenz-cn02b.mail.protection.partner.outlook.cn
77	c7d3d7276f30dc72efbeb8e54423b1b47f63c58c.msv1.invalid
78	b894a10f9d664f0b272df24349d0136fba05a89b.msv1.invalid
79	261fab891c9e30b9a8437b2307e7e67ebbfeee85.msv1.invalid
80	86da5df266ee85ba1c9b2e19f890526f1191355e.msv1.invalid
81	7a1b696a13d31b9dd635db9c58d1f1c23c2c8288.msv1.invalid
82	\234\176\149\235\130\168\235\167\155\236\167\145.net
83	gdsservices-com0i.mail.protection.partner.outlook.cn
84	f32ulet7jexwiwmrwipot2hs332uejyx5q5nwf3ggp77wer7utca
85	jqtyfzs58md1ra71.dbb7owi5iazdyuvq.pki-validation.com
86	t2hbn3v62hu8w3s5.nx7lu0xvfrcp3ikg.pki-validation.com
87	porschepcn-com01i.mail.protection.partner.outlook.cn
88	5c7am4rrhs7xh7sgmu74qjaqd4phx2qifzbv6jl3i3xz3zhjqqqq
89	3osdx5cysr5ezqynjk3rxbwfxkoqwt47ek32cdcy7uar65mfindq
90	3aas5bdlzoabws5g7mber6wtuyuvqjldemho2xwpx2pjf36yejoa
91	outdoormaster-com.mail.protection.partner.outlook.cn
92	ec2-54-249-8-39.ap-northeast-1.compute.amazonaws.com
93	qctzdy9yn1z9q3cj.gpqh6jl7d4xobee0.pki-validation.com
94	baishancloud-com.mail.protection.partner.outlook.cn
95	chevrolet-com-cn.mail.protection.partner.outlook.cn
96	decathlon-com-cn.mail.protection.partner.outlook.cn
97	hamamatsu-com-cn.mail.protection.partner.outlook.cn
98	switchbot-com01e.mail.protection.partner.outlook.cn
99	healthkeepers-cn.mail.protection.partner.outlook.cn
100	ad3e7ce1-ec95-4e87-8be4-fe6dc4a0f95c.clouding.host

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	22 556
2	de	5 412
3	net	4 499
4	ru	3 372
5	org	2 768
6	pl	1 957
7	jp	1 557
8	it	1 492
9	fr	1 428
10	cz	1 347
11	co.uk	1 207
12	nl	1 141
13	cfd	979
14	com.br	867
15	eu	822

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 2026-09-13. Aggregates only — raw data is deleted after analysis per the OpenINTEL data agreement.