| Count | MTA |
|---|---|
| 2995 | unknown |
| 1061 | Exim |
| 777 | postfix |
| 533 | MS Exchange |
| 265 | mdaemon |
| 217 | blocked |
| 105 | sendmail |
| 70 | Cisco |
| 44 | Kerio |
| 40 | communigate |
| 26 | UserGate |
| 22 | Lotus Domino |
| 22 | stalker |
| 14 | eSafe |
| 4 | qmail |
| 4 | barracuda |
| 4 | TrafficInspector |
| 4 | MailEnable |
| 4 | XMail |
| 1 | XWall/Exchange |
| 1 | CheckPoint FW |
| 1 | Eserv |
| 1 | IceWarp |
| 1 | $1 |
| 1 | james |
| 1 | qpsmtpd |
| 6218 | TOTAL |