Ranked by the number of sites we detect running each one.
| Rank | Technology | Sites |
|---|---|---|
| 1 | Google Workspace | 21.5M |
| 2 | Microsoft 365 | 18.9M |
| 3 | GoDaddy Email | 9.6M |
| 4 | Zoho Mail | 2.7M |
| 5 | Rackspace | 2.1M |
| 6 | Proofpoint | 1.2M |
| 7 | Titan | 917.8K |
| 8 | RoundCube | 841.8K |
| 9 | Gandi | 757.1K |
| 10 | Rackspace Email | 709.8K |
| 11 | Namecheap Email | 699.3K |
| 12 | SpamExperts | 620.6K |
| 13 | iCloud Mail | 554K |
| 14 | Proton Mail | 490.3K |
| 15 | Tencent Email | 454.6K |
| 16 | Fortinet | 410.6K |
| 17 | Mail.ru | 360.3K |
| 18 | IONOS Mail | 301.5K |
| 19 | Fastmail | 245.1K |
| 20 | Alibaba Email | 206.2K |
| 21 | Mimecast | 186.1K |
| 22 | ImprovMX | 169.2K |
| 23 | Barracuda | 142.9K |
| 24 | ForwardEmail | 142.8K |
| 25 | Sophos | 98.3K |
| 26 | Migadu | 53.8K |
| 27 | Trend Micro | 46.6K |
| 28 | NetEase | 42.5K |
| 29 | Cisco IronPort | 28.6K |
| 30 | Symantec | 25.2K |
| 31 | Tuta | 24.6K |
| 32 | SmtpJS | 8.1K |
| 33 | Naver | 5K |
| 34 | HEY | 4K |
| 35 | UK Mail | 643 |
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