| Count | MTA |
|---|---|
| 3206 | Exim |
| 1903 | blocked |
| 1543 | unknown |
| 1418 | postfix |
| 1123 | MailEnable |
| 984 | MS Exchange |
| 929 | mdaemon |
| 240 | Cisco |
| 127 | qmail |
| 107 | Kerio |
| 44 | IceWarp |
| 31 | sendmail |
| 21 | EMailArchitect |
| 16 | rblsmtpd |
| 10 | SurgeSMTP |
| 4 | CCProxy |
| 3 | stalker |
| 3 | qpsmtpd |
| 2 | barracuda |
| 2 | Mercury |
| 2 | communigate |
| 1 | Windows NAI WebShield |
| 1 | RaidenMAILD |
| 1 | MikroTik |
| 1 | imail |
| 1 | worldgroup |
| 1 | hmailserver |
| 11724 | TOTAL |