| Count | MTA |
|---|---|
| 2827 | postfix |
| 1525 | Exim |
| 1199 | blocked |
| 467 | unknown |
| 383 | MS Exchange |
| 339 | sendmail |
| 88 | mdaemon |
| 44 | Cisco |
| 41 | qmail |
| 37 | Kerio |
| 34 | Lotus Domino |
| 23 | qpsmtpd |
| 17 | MailEnable |
| 14 | barracuda |
| 11 | PowerMTA |
| 9 | XMail |
| 7 | Mercury |
| 7 | eSafe |
| 7 | communigate |
| 6 | spamd |
| 5 | TrendMicro Reputation |
| 5 | IceWarp |
| 5 | SurgeSMTP |
| 5 | rblsmtpd |
| 3 | XWall/Exchange |
| 2 | hmailserver |
| 2 | InterScan |
| 2 | DeskNow |
| 1 | Winmail |
| 1 | David |
| 1 | Lyris |
| 1 | Argosoft NT |
| 1 | Sun JSMS |
| 1 | Sophos |
| 7120 | TOTAL |