Mail providers used by 2,728,987 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
1,183,765
43.4%
Microsoft 365
508,201
18.6%
Google Workspace
391,381
14.3%
IONOS / 1&1
109,501
4.0%
Strato
68,228
2.5%
OVH
49,277
1.8%
Proofpoint
36,013
1.3%
SolarWinds MSP / SpamExperts
30,414
1.1%
Cloudflare Email Routing
30,360
1.1%
Hostinger
25,745
0.9%
GoDaddy Email
23,261
0.9%
Namecheap Email Forwarding
21,273
0.8%
Mimecast
20,262
0.7%
Jellyfish
16,935
0.6%
Infomaniak
15,432
0.6%
no-mail (null MX)
15,041
0.6%
Zoho
14,616
0.5%
Hornetsecurity
13,780
0.5%
Barracuda
13,396
0.5%
ISPGateway
13,061
0.5%
QQ Enterprise (Tencent)
12,727
0.5%
Register.it
10,246
0.4%
StackMail
10,077
0.4%
Rackspace Email
9,741
0.4%
Gandi
9,214
0.3%
Alibaba Mail (HiChina)
7,456
0.3%
MailChannels
5,737
0.2%
Mailgun
5,409
0.2%
Titan Mail
4,753
0.2%
Proton
4,717
0.2%
Fastmail
4,334
0.2%
Sophos Email Security
4,210
0.2%
Amazon SES
4,155
0.2%
Forward Email
4,008
0.1%
Cisco IronPort
3,927
0.1%
NetEase (163)
3,926
0.1%
Namecheap Private Email
3,653
0.1%
Parked (above.com)
3,594
0.1%
Yandex
2,234
0.1%
DreamHost
2,027
0.1%
iCloud / Apple
1,967
0.1%
ImprovMX
1,807
0.1%
Mailbox.org
1,583
0.1%
Feishu (Lark)
1,408
0.1%
DonDominio
1,135
0.0%
Vade Secure
1,129
0.0%
Yahoo
1,074
0.0%
Migadu
930
0.0%
SendGrid
860
0.0%
Purelymail
474
0.0%
Fortinet
313
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.