| Count | MTA |
|---|---|
| 34275 | unknown |
| 13558 | Exim |
| 11540 | postfix |
| 5535 | blocked |
| 4554 | sendmail |
| 1763 | qmail |
| 1156 | MS Exchange |
| 941 | mdaemon |
| 440 | MailEnable |
| 338 | Kerio |
| 180 | Cisco |
| 136 | communigate |
| 78 | XMail |
| 53 | Lotus Domino |
| 24 | eSafe |
| 21 | Mercury |
| 21 | rblsmtpd |
| 17 | stalker |
| 12 | barracuda |
| 11 | qpsmtpd |
| 10 | UserGate |
| 9 | IceWarp |
| 6 | SurgeSMTP |
| 5 | TrendMicro Reputation |
| 4 | hmailserver |
| 3 | mailmarshal |
| 2 | spamd |
| 2 | imail |
| 2 | james |
| 2 | MIMESWeeper |
| 1 | CCProxy |
| 1 | PowerMTA |
| 1 | TrafficInspector |
| 1 | WinRoute |
| 1 | Argosoft NT |
| 1 | XWall/Exchange |
| 1 | Net::SMTP::Server |
| 1 | merak |
| 1 | CheckPoint FW |
| 1 | Novonyx |
| 74708 | TOTAL |