Mail providers used by 2,726,533 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

1,182,887

43.4%

Microsoft 365

507,614

18.6%

Google Workspace

390,557

14.3%

IONOS / 1&1

109,715

4.0%

Strato

68,209

2.5%

OVH

49,214

1.8%

Proofpoint

35,983

1.3%

SolarWinds MSP / SpamExperts

30,403

1.1%

Cloudflare Email Routing

30,373

1.1%

Hostinger

25,696

0.9%

GoDaddy Email

23,244

0.9%

Namecheap Email Forwarding

21,187

0.8%

Mimecast

20,236

0.7%

Jellyfish

16,920

0.6%

Infomaniak

15,421

0.6%

no-mail (null MX)

14,903

0.5%

Zoho

14,570

0.5%

Hornetsecurity

13,753

0.5%

Barracuda

13,387

0.5%

ISPGateway

13,061

0.5%

QQ Enterprise (Tencent)

12,728

0.5%

StackMail

10,326

0.4%

10,237

0.4%

Rackspace Email

9,730

0.4%

Gandi

9,208

0.3%

Alibaba Mail (HiChina)

7,442

0.3%

MailChannels

5,735

0.2%

Mailgun

5,406

0.2%

Titan Mail

4,752

0.2%

Proton

4,716

0.2%

Fastmail

4,328

0.2%

Sophos Email Security

4,200

0.2%

Amazon SES

4,151

0.2%

Forward Email

4,003

0.1%

Cisco IronPort

3,929

0.1%

NetEase (163)

3,925

0.1%

Namecheap Private Email

3,648

0.1%

Parked (above.com)

3,538

0.1%

Yandex

2,233

0.1%

DreamHost

2,026

0.1%

iCloud / Apple

1,967

0.1%

ImprovMX

1,799

0.1%

Mailbox.org

1,583

0.1%

Feishu (Lark)

1,405

0.1%

Vade Secure

1,149

0.0%

DonDominio

1,132

0.0%

Yahoo

1,073

0.0%

Migadu

927

0.0%

SendGrid

901

0.0%

Purelymail

471

0.0%

Fortinet

312

0.0%

Tutanota

220

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.