IS.CC Relay — market share 2026

esp

According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), IS.CC Relay is the email service provider (ESP) for 98 domains — 0.02% of 617,702 SPF-publishing domains. Its strongest TLD is .com (57.1% of its domains). Detection: include: mechanisms in the SPF record.

98domains

0.02%of SPF-publishing domains

26distinct TLDs

2026-07-13snapshot (updated daily)

Commonly used together with IS.CC Relay

What else the same 98 domains use — cross-tabulated from the same daily snapshot (2026-07-13).

Type	Service	Domains	Share of IS.CC Relay users
Mailbox	Self-Hosted	81	82.7%
Mailbox	Google Workspace	8	8.2%
Mailbox	Unknown / Other	3	3.1%
Mailbox	Microsoft 365	2	2.0%
Mailbox	Barracuda	1	1.0%
Mailbox	Generic / unmatched (mx.)	1	1.0%
ESP	MailChannels	23	23.5%
ESP	Amazon SES	3	3.1%
ESP	Mailgun	2	2.0%
ESP	Barracuda Email Security	1	1.0%

TLD distribution (top 26 of 26)

com — 56 (57.1%)

org — 7 (7.1%)

net — 7 (7.1%)

cl — 3 (3.1%)

info — 2 (2.0%)

in — 2 (2.0%)

com.bd — 2 (2.0%)

at — 1 (1.0%)

website — 1 (1.0%)

biz — 1 (1.0%)

co.za — 1 (1.0%)

lv — 1 (1.0%)

az — 1 (1.0%)

cz — 1 (1.0%)

com.pe — 1 (1.0%)

pk — 1 (1.0%)

gh — 1 (1.0%)

hr — 1 (1.0%)

ir — 1 (1.0%)

org.uk — 1 (1.0%)

mx — 1 (1.0%)

ai — 1 (1.0%)

ee — 1 (1.0%)

cc — 1 (1.0%)

com.ar — 1 (1.0%)

ve — 1 (1.0%)

Frequently asked questions

How many domains use IS.CC Relay?

98 domains in the Tranco top-1M use IS.CC Relay as their email service provider (ESP) as of July 13, 2026, according to Live Direct Marketing's daily DNS scan.

What is IS.CC Relay's market share?

IS.CC Relay holds 0.02% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-13). The number is recomputed every day.

What are the biggest alternatives to IS.CC Relay?

The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-07-13).

Largest email service provider (ESP)s in this category

Amazon SES (6.21%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.86%) · Mailchimp (3.69%) · Mandrill (3.36%) · HubSpot (3.18%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.80%)

ESP / mailing services portfolio → · Full daily report →

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Domain sample (top 98 by Tranco rank)

interserver.netcplemaire.netrelevantdirectories.comgwm.comdirectorioempresarialmexico.comhiddenrefer.comgonlinesites.comheroscapers.compowerwale.compcpsr.orgdirectoryanalytic.comburuniv.ac.insrirangaminfo.comwebstersdictionary1828.comglobexcamhost.comnoarjobs.infoapeopledirectory.compostbank.iropenaccesspub.orgkaranpc.comhostdepartment.compromohosts.comiq-tel.netm106.combestdirectory4you.comefdir.comcasi.com.arieindia.orgsmm-world.comferrepat.compiratedirectory.orginterlatino.netopenbci.comcrickhost.comtracyjames.comcratis.ccmcqsplanet.comlinkedin-directory.comthekingsbible.comchinesefortunecalendar.comkahvekulubu.netblackandbluedirectory.comcookingwithnonna.comcratis.hrrelateddirectory.orgradio.lvlm.eecypo.compragyanet.commass-schedules.comkingjamesbibledictionary.comservidoreshosting.clifidir.comrelevantdirectory.bizunixsrv9.comadaptsmedia.infonirvanabotanics.comjournalist101.comhostingsimple.clthemalachiteforest.comswtpltd.compakistanlawyer.comwfc.orgturkuler.comcampus.pkamarbooks.orgbolobedumusic.comclassicurdumaterial.comnits.com.bdpowerhouseegypt.comwrintiewaar.co.zanavi.azservidorhosting.clanzscosearch.comgumpasteflowersbysuzette.comoverdns.combrownedgedirectory.compakwebdeveloper.comstreamtunesmusic.comhalstedresearch.org.ukaeromalls.comalmusamam-sa.comcohk.edu.ghdat.aidevilsmmo.comdicomere.comeduvale.inelregionalpiura.com.pefragrantsouq.comgorsi.netgspotwizard.comiujoac.org.veoroboros.atplexus.com.bdrockshop.czrosentreter.websitetooltown.mxwaynejohnson.net

Showing 98 of 98 domains.