| Count | MTA |
|---|---|
| 207 | postfix |
| 119 | MS Exchange |
| 77 | blocked |
| 51 | unknown |
| 35 | Exim |
| 32 | Cisco |
| 23 | sendmail |
| 19 | MailEnable |
| 15 | qmail |
| 11 | mdaemon |
| 6 | Kerio |
| 5 | Lotus Domino |
| 4 | rblsmtpd |
| 3 | Argosoft NT |
| 2 | merak |
| 2 | XWall/Exchange |
| 1 | barracuda |
| 1 | TrendMicro Reputation |
| 1 | InterScan |
| 614 | TOTAL |