Mail providers used by 2,622,530 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

1,138,409

43.4%

Microsoft 365

492,573

18.8%

Google Workspace

374,455

14.3%

IONOS / 1&1

107,589

4.1%

Strato

67,124

2.6%

OVH

47,115

1.8%

Proofpoint

35,025

1.3%

SolarWinds MSP / SpamExperts

29,376

1.1%

Cloudflare Email Routing

26,812

1.0%

Hostinger

22,811

0.9%

GoDaddy Email

22,332

0.9%

Mimecast

19,899

0.8%

Namecheap Email Forwarding

19,284

0.7%

Jellyfish

15,543

0.6%

Infomaniak

14,813

0.6%

Zoho

13,615

0.5%

no-mail (null MX)

13,381

0.5%

Hornetsecurity

13,254

0.5%

Barracuda

13,074

0.5%

ISPGateway

12,973

0.5%

QQ Enterprise (Tencent)

11,777

0.4%

StackMail

10,134

0.4%

10,012

0.4%

Rackspace Email

9,508

0.4%

Gandi

8,975

0.3%

Alibaba Mail (HiChina)

6,790

0.3%

MailChannels

5,502

0.2%

Mailgun

5,291

0.2%

Proton

4,464

0.2%

Titan Mail

4,402

0.2%

Sophos Email Security

4,133

0.2%

Fastmail

4,077

0.2%

Amazon SES

3,996

0.2%

Cisco IronPort

3,901

0.1%

Forward Email

3,601

0.1%

NetEase (163)

3,569

0.1%

Namecheap Private Email

3,430

0.1%

Parked (above.com)

3,037

0.1%

Yandex

2,131

0.1%

DreamHost

1,944

0.1%

iCloud / Apple

1,834

0.1%

ImprovMX

1,655

0.1%

Mailbox.org

1,527

0.1%

Feishu (Lark)

1,302

0.0%

Vade Secure

1,236

0.0%

DonDominio

1,089

0.0%

Yahoo

1,031

0.0%

SendGrid

949

0.0%

Migadu

855

0.0%

Purelymail

396

0.0%

Fortinet

313

0.0%

Tutanota

212

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.