| Count | MTA |
|---|---|
| 360 | postfix |
| 270 | MS Exchange |
| 261 | blocked |
| 107 | unknown |
| 88 | sendmail |
| 75 | Exim |
| 31 | Cisco |
| 17 | MailEnable |
| 16 | qmail |
| 14 | Kerio |
| 12 | TrendMicro Reputation |
| 8 | communigate |
| 5 | Lotus Domino |
| 3 | barracuda |
| 2 | Spamfilter ISP |
| 2 | Sophos |
| 2 | SurgeSMTP |
| 2 | IceWarp |
| 1 | mdaemon |
| 1 | Novell Groupwise |
| 1 | Mercury |
| 1 | InterScan |
| 1 | hmailserver |
| 1280 | TOTAL |