| Count | MTA |
|---|---|
| 259 | postfix |
| 182 | MS Exchange |
| 97 | blocked |
| 69 | Exim |
| 55 | sendmail |
| 38 | Cisco |
| 28 | mdaemon |
| 22 | unknown |
| 11 | TrendMicro Reputation |
| 9 | Kerio |
| 6 | barracuda |
| 5 | merak |
| 3 | rblsmtpd |
| 3 | Scalix |
| 3 | MailEnable |
| 3 | eSafe |
| 2 | Argosoft NT |
| 2 | SonicWALL |
| 2 | firstclass |
| 2 | qmail |
| 1 | XWall/Exchange |
| 1 | Sophos |
| 1 | Lotus Domino |
| 804 | TOTAL |