Mail providers used by 2,232,118 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

929,063

41.6%

Microsoft 365

447,219

20.0%

Google Workspace

350,165

15.7%

IONOS / 1&1

70,402

3.2%

OVH

43,257

1.9%

Strato

37,993

1.7%

Proofpoint

33,954

1.5%

SolarWinds MSP / SpamExperts

24,803

1.1%

Cloudflare Email Routing

24,406

1.1%

GoDaddy Email

20,513

0.9%

Hostinger

20,155

0.9%

Mimecast

19,461

0.9%

Namecheap Email Forwarding

18,405

0.8%

Jellyfish

14,674

0.7%

Barracuda

12,624

0.6%

Zoho

12,512

0.6%

Infomaniak

11,639

0.5%

no-mail (null MX)

10,902

0.5%

QQ Enterprise (Tencent)

10,814

0.5%

Hornetsecurity

10,799

0.5%

StackMail

9,290

0.4%

ISPGateway

8,908

0.4%

Rackspace Email

8,724

0.4%

Gandi

8,377

0.4%

Alibaba Mail (HiChina)

6,228

0.3%

5,535

0.2%

MailChannels

5,269

0.2%

Mailgun

5,039

0.2%

Proton

4,198

0.2%

Titan Mail

4,006

0.2%

Fastmail

3,906

0.2%

Cisco IronPort

3,816

0.2%

Amazon SES

3,810

0.2%

Sophos Email Security

3,674

0.2%

Forward Email

3,405

0.2%

NetEase (163)

3,288

0.1%

Namecheap Private Email

3,222

0.1%

Parked (above.com)

2,248

0.1%

Yandex

2,041

0.1%

DreamHost

1,879

0.1%

iCloud / Apple

1,671

0.1%

ImprovMX

1,568

0.1%

Feishu (Lark)

1,219

0.1%

Mailbox.org

1,210

0.1%

Vade Secure

1,204

0.1%

DonDominio

1,055

0.0%

Yahoo

999

0.0%

SendGrid

932

0.0%

Migadu

775

0.0%

Purelymail

361

0.0%

Fortinet

301

0.0%

Tutanota

200

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.