| Count | MTA |
|---|---|
| 1985 | postfix |
| 1297 | blocked |
| 1282 | MS Exchange |
| 461 | sendmail |
| 351 | unknown |
| 260 | Exim |
| 240 | barracuda |
| 221 | Cisco |
| 137 | MailEnable |
| 98 | mdaemon |
| 95 | qmail |
| 83 | eSafe |
| 51 | imail |
| 42 | communigate |
| 41 | Lotus Domino |
| 34 | Eudora |
| 28 | qpsmtpd |
| 24 | Kerio |
| 23 | TrendMicro Reputation |
| 18 | IceWarp |
| 18 | Mercury |
| 12 | SurgeSMTP |
| 11 | Argosoft NT |
| 10 | rblsmtpd |
| 9 | DeskNow |
| 8 | SonicWALL |
| 8 | mailmarshal |
| 6 | Novell Groupwise |
| 6 | hmailserver |
| 5 | assp |
| 5 | merak |
| 4 | XMail |
| 3 | XWall/Exchange |
| 3 | Sun JSMS |
| 2 | Sophos |
| 2 | AS/400 IBM SMTP |
| 2 | Code-Crafters |
| 2 | Ocean Mail |
| 2 | WinWebMail |
| 1 | spamsniper |
| 1 | internetanywhere |
| 1 | CMailServer |
| 1 | inscitek |
| 1 | PowerMTA |
| 1 | mirapoint |
| 1 | Hexamail |
| 6896 | TOTAL |