| Count | MTA |
|---|---|
| 7577 | postfix |
| 1470 | Exim |
| 878 | blocked |
| 458 | sendmail |
| 422 | MS Exchange |
| 144 | unknown |
| 123 | qmail |
| 36 | Cisco |
| 21 | eSafe |
| 21 | mdaemon |
| 20 | qpsmtpd |
| 14 | rblsmtpd |
| 10 | Kerio |
| 8 | MailEnable |
| 6 | barracuda |
| 4 | firstclass |
| 4 | Mercury |
| 3 | communigate |
| 2 | WinRoute |
| 2 | XWall/Exchange |
| 2 | Lotus Domino |
| 1 | Hexamail |
| 1 | Scalix |
| 1 | SonicWALL |
| 1 | Sophos |
| 1 | XMail |
| 1 | hmailserver |
| 1 | merak |
| 1 | Python SMTP |
| 11233 | TOTAL |