| Count | MTA |
|---|---|
| 3669 | postfix |
| 2819 | Exim |
| 2438 | blocked |
| 2039 | unknown |
| 1978 | MS Exchange |
| 1210 | qmail |
| 596 | MailEnable |
| 189 | sendmail |
| 125 | eSafe |
| 120 | Cisco |
| 61 | rblsmtpd |
| 40 | mdaemon |
| 27 | barracuda |
| 21 | qpsmtpd |
| 18 | Lotus Domino |
| 15 | Kerio |
| 13 | TrendMicro Reputation |
| 9 | communigate |
| 8 | IceWarp |
| 6 | EMailArchitect |
| 6 | XMail |
| 5 | Sophos |
| 5 | mailmarshal |
| 4 | hmailserver |
| 4 | Argosoft NT |
| 4 | InterScan |
| 3 | Scalix |
| 3 | Novell Groupwise |
| 3 | imail |
| 3 | Windows NAI WebShield |
| 2 | SonicWALL |
| 2 | merak |
| 2 | obtuse |
| 2 | Mercury |
| 1 | CCProxy |
| 1 | Softalk |
| 1 | james |
| 1 | netscape |
| 1 | Eudora |
| 1 | DeskNow |
| 1 | CheckPoint FW |
| 1 | XWall/Exchange |
| 15457 | TOTAL |