| Count | MTA |
|---|---|
| 8502 | postfix |
| 1220 | Exim |
| 591 | blocked |
| 283 | unknown |
| 237 | sendmail |
| 95 | MS Exchange |
| 86 | qmail |
| 55 | MailEnable |
| 25 | spamsniper |
| 15 | Cisco |
| 14 | coremail |
| 12 | barracuda |
| 11 | rblsmtpd |
| 10 | Lotus Domino |
| 9 | PowerMTA |
| 8 | Kerio |
| 8 | qpsmtpd |
| 7 | communigate |
| 5 | eSafe |
| 5 | IceWarp |
| 3 | Python SMTP |
| 2 | Argosoft NT |
| 2 | CheckPoint FW |
| 2 | Mercury |
| 2 | SurgeSMTP |
| 2 | mdaemon |
| 1 | merak |
| 1 | hmailserver |
| 1 | XWall/Exchange |
| 1 | UNIX/Windows Lotus SMTP MTA |
| 1 | UCEPROTECT |
| 1 | stalker |
| 1 | Sophos |
| 11218 | TOTAL |