| Count | MTA |
|---|---|
| 1126 | Exim |
| 554 | postfix |
| 435 | MS Exchange |
| 198 | mdaemon |
| 153 | sendmail |
| 152 | blocked |
| 125 | unknown |
| 95 | Kerio |
| 67 | MailEnable |
| 48 | qmail |
| 44 | Cisco |
| 40 | Lotus Domino |
| 15 | communigate |
| 13 | stalker |
| 8 | rblsmtpd |
| 4 | UserGate |
| 3 | barracuda |
| 3 | IceWarp |
| 3 | XMail |
| 3 | james |
| 3 | qpsmtpd |
| 2 | eSafe |
| 1 | dmail |
| 1 | Argosoft NT |
| 1 | XWall/Exchange |
| 1 | Eserv |
| 1 | TrafficInspector |
| 1 | Novell Groupwise |
| 1 | Mercury |
| 1 | vpop3 |
| 1 | hmailserver |
| 3103 | TOTAL |