| Count | MTA |
|---|---|
| 383 | MS Exchange |
| 148 | postfix |
| 81 | unknown |
| 78 | mdaemon |
| 64 | Exim |
| 42 | blocked |
| 23 | Cisco |
| 18 | qmail |
| 18 | sendmail |
| 12 | IceWarp |
| 11 | Kerio |
| 9 | barracuda |
| 8 | mailmarshal |
| 6 | MailEnable |
| 3 | eSafe |
| 2 | communigate |
| 2 | Scalix |
| 2 | Sophos |
| 1 | hmailserver |
| 1 | $1 |
| 1 | Lotus Domino |
| 1 | imail |
| 1 | merak |
| 915 | TOTAL |