Mail providers used by 2,639,076 domains

Which mail platform delivers email for each indexed domain, inferred from the first MX record. A domain that publishes MX is claiming to receive mail somewhere — these are the somewheres.

Self-hosted / unclassified

1,145,070

43.4%

Microsoft 365

494,452

18.7%

Google Workspace

377,386

14.3%

IONOS / 1&1

107,879

4.1%

Strato

67,252

2.5%

OVH

47,459

1.8%

Proofpoint

35,144

1.3%

SolarWinds MSP / SpamExperts

29,603

1.1%

Cloudflare Email Routing

27,629

1.0%

Hostinger

23,313

0.9%

GoDaddy Email

22,469

0.9%

Mimecast

19,954

0.8%

Namecheap Email Forwarding

19,012

0.7%

Jellyfish

15,672

0.6%

Infomaniak

14,907

0.6%

Zoho

13,728

0.5%

no-mail (null MX)

13,652

0.5%

Hornetsecurity

13,296

0.5%

Barracuda

13,118

0.5%

ISPGateway

12,980

0.5%

QQ Enterprise (Tencent)

12,238

0.5%

StackMail

10,238

0.4%

10,049

0.4%

Rackspace Email

9,573

0.4%

Gandi

9,011

0.3%

Alibaba Mail (HiChina)

7,061

0.3%

MailChannels

5,528

0.2%

Mailgun

5,304

0.2%

Proton

4,486

0.2%

Titan Mail

4,439

0.2%

Forward Email

4,246

0.2%

Sophos Email Security

4,135

0.2%

Fastmail

4,106

0.2%

Amazon SES

4,014

0.2%

Cisco IronPort

3,907

0.1%

NetEase (163)

3,720

0.1%

Namecheap Private Email

3,453

0.1%

Parked (above.com)

3,062

0.1%

Yandex

2,158

0.1%

DreamHost

1,948

0.1%

iCloud / Apple

1,844

0.1%

ImprovMX

1,680

0.1%

Mailbox.org

1,532

0.1%

Feishu (Lark)

1,323

0.1%

Vade Secure

1,233

0.0%

DonDominio

1,091

0.0%

Yahoo

1,038

0.0%

SendGrid

896

0.0%

Migadu

858

0.0%

Purelymail

403

0.0%

Fortinet

314

0.0%

Tutanota

213

0.0%

Method

We classify the first MX host with a pattern table: aspmx.l.google.com → Google Workspace, *.mail.protection.outlook.com → Microsoft 365, and so on. Domains with no MX, a null MX, or an unrecognised host fall into the trailing buckets. The first MX is used as a proxy for the whole zone — true multi-vendor setups are rare and would land in other.