Mail providers used by 1,171,088 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

430,123

36.7%

Microsoft 365

236,529

20.2%

Google Workspace

215,100

18.4%

IONOS / 1&1

36,155

3.1%

OVH

26,398

2.3%

Proofpoint

23,331

2.0%

Strato

15,888

1.4%

Mimecast

14,195

1.2%

SolarWinds MSP / SpamExperts

13,412

1.1%

GoDaddy Email

13,189

1.1%

Namecheap Email Forwarding

11,963

1.0%

Hostinger

11,559

1.0%

Cloudflare Email Routing

10,926

0.9%

Jellyfish

8,896

0.8%

Barracuda

8,101

0.7%

Zoho

7,409

0.6%

Hornetsecurity

6,981

0.6%

QQ Enterprise (Tencent)

6,808

0.6%

Rackspace Email

5,721

0.5%

Gandi

5,666

0.5%

no-mail (null MX)

5,573

0.5%

StackMail

5,128

0.4%

ISPGateway

5,056

0.4%

Alibaba Mail (HiChina)

3,941

0.3%

Infomaniak

3,615

0.3%

MailChannels

3,291

0.3%

Mailgun

3,065

0.3%

Fastmail

2,828

0.2%

Cisco IronPort

2,598

0.2%

Proton

2,507

0.2%

Amazon SES

2,355

0.2%

Titan Mail

2,251

0.2%

Sophos Email Security

2,243

0.2%

NetEase (163)

2,036

0.2%

Namecheap Private Email

2,025

0.2%

Forward Email

1,642

0.1%

Parked (above.com)

1,585

0.1%

1,448

0.1%

Yandex

1,330

0.1%

DreamHost

1,294

0.1%

iCloud / Apple

1,000

0.1%

Vade Secure

913

0.1%

ImprovMX

902

0.1%

Feishu (Lark)

865

0.1%

Mailbox.org

762

0.1%

DonDominio

744

0.1%

Yahoo

640

0.1%

Migadu

455

0.0%

Purelymail

214

0.0%

Fortinet

190

0.0%

Tutanota

141

0.0%

SendGrid

101

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.