| Count | MTA |
|---|---|
| 136 | postfix |
| 104 | MS Exchange |
| 79 | blocked |
| 30 | unknown |
| 29 | Exim |
| 19 | Cisco |
| 9 | sendmail |
| 7 | Kerio |
| 7 | communigate |
| 4 | $1 |
| 4 | MailEnable |
| 4 | mdaemon |
| 3 | qmail |
| 2 | Sun JSMS |
| 2 | SonicWALL |
| 2 | Symantec AVGate |
| 2 | Mercury |
| 2 | qpsmtpd |
| 2 | rblsmtpd |
| 1 | iPlanet |
| 1 | Lotus Domino |
| 1 | imail |
| 1 | InterScan |
| 1 | TrendMicro Reputation |
| 452 | TOTAL |