FSI Email Security — market share 2026

esp

According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), FSI Email Security is the email service provider (ESP) for 593 domains — 0.10% of 617,244 SPF-publishing domains. Its strongest TLD is .jp (35.2% of its domains). Detection: include: mechanisms in the SPF record.

593domains

0.10%of SPF-publishing domains

18distinct TLDs

2026-07-12snapshot (updated daily)

Commonly used together with FSI Email Security

What else the same 593 domains use — cross-tabulated from the same daily snapshot (2026-07-12).

Type	Service	Domains	Share of FSI Email Security users
Mailbox	FSI (JP ISP)	251	42.3%
Mailbox	Self-Hosted	83	14.0%
Mailbox	Google Workspace	73	12.3%
Mailbox	Unknown / Other	59	9.9%
Mailbox	Microsoft 365	50	8.4%
Mailbox	Kagoya (JP)	14	2.4%
ESP	Q-Send	178	30.0%
ESP	Repica WebCAS	47	7.9%
ESP	Amazon SES	46	7.8%
ESP	BizMatrix	28	4.7%

TLD distribution (top 18 of 18)

jp — 209 (35.2%)

com — 178 (30.0%)

co.jp — 143 (24.1%)

net — 20 (3.4%)

ne.jp — 8 (1.3%)

or.jp — 8 (1.3%)

shop — 8 (1.3%)

ac.jp — 6 (1.0%)

org — 3 (0.5%)

coop — 2 (0.3%)

life — 1 (0.2%)

me — 1 (0.2%)

today — 1 (0.2%)

mu — 1 (0.2%)

link — 1 (0.2%)

tokyo — 1 (0.2%)

in — 1 (0.2%)

info — 1 (0.2%)

Frequently asked questions

How many domains use FSI Email Security?

593 domains in the Tranco top-1M use FSI Email Security as their email service provider (ESP) as of July 12, 2026, according to Live Direct Marketing's daily DNS scan.

What is FSI Email Security's market share?

FSI Email Security holds 0.10% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-12). The number is recomputed every day.

What are the biggest alternatives to FSI Email Security?

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 2026-07-12).

Largest email service provider (ESP)s in this category

Amazon SES (6.21%) · SendGrid (Twilio) (4.75%) · Mailgun (4.11%) · Zendesk (3.87%) · 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 100 by Tranco rank)

toyokeizai.net gigabyte.comzaq.ne.jpozmall.co.jpasp-frontier.netform-mailer.jplivepocket.jpfuture-s.combyoinnavi.jpkahaku.go.jpitscom.jpclassi.jpe-earphone.jphalmek.co.jpohsho.co.jpizumi.jpeeo.todaysirogohan.comfate-go.jpsixapart.combuysellonline.jproute-inn.co.jpbildy.jpkyodonewsprwire.jplindt.jpburtsbees.comtravel.co.jpeflora.co.jpmiyazaki-catv.ne.jpsoulberry.jpcongre.co.jpnhk-book.co.jpminimini.jpnara-np.co.jpagaroot.jpseinan-gu.ac.jpjrhakatacity.com24028.jpurban-research.jpmac-house.co.jpfuture-shop.jporihica.comletao.jpsacsbar.comreceno.commaildealer.jpdelfonics.comcystore.compierrotshop.jpmedrt.comthanko.jpfujikyu.co.jpkagu350.comtokyodesignchannel.compaqtomog.comsuper-kinokuniya.jpkabuyutai.commaxell.co.jphobbyra-hobbyre.comperfect-space.jpgold-japan.jpscreen.co.jpikedakohgei.jpuccard.co.jpdenhamanobag.jpgoldenbearstore.jpzoom.co.jpicu.ac.jpitoen.co.jpfunky802.comjamtrading.jptokyo-med.ac.jpjb-honshi.co.jpepsilon.jphobbyjapan.co.jpfnet.ne.jpatlus.co.jphokkaido-gas.co.jpbeingcorp.co.jpjeugia.co.jpsaraya.comaxa-wealth-management.co.jpnoritake.co.jptanabesports.complus.co.jphrpro.co.jpsotetsu.co.jptsuruha.co.jpporco-rosso.co.jpdaito.ac.jphidya.jpmedical-tribune.co.jpask-corp.jpmedica.co.jpdm-net.co.jpjccu.coopcontec.comichiran.comcoleman.co.jptsogen.co.jp

Showing 100 of 593 domains.