| Count | MTA |
|---|---|
| 4408 | postfix |
| 1924 | blocked |
| 1250 | Exim |
| 980 | MS Exchange |
| 779 | sendmail |
| 598 | unknown |
| 271 | qmail |
| 173 | Cisco |
| 159 | eSafe |
| 113 | intermail |
| 105 | rblsmtpd |
| 27 | Kerio |
| 22 | MailEnable |
| 19 | firstclass |
| 16 | Sophos |
| 16 | Lotus Domino |
| 13 | mdaemon |
| 10 | TrendMicro Reputation |
| 10 | barracuda |
| 9 | merak |
| 8 | qpsmtpd |
| 8 | IceWarp |
| 4 | communigate |
| 4 | Mercury |
| 4 | hmailserver |
| 4 | SurgeSMTP |
| 4 | UNIX Zmailer |
| 4 | XWall/Exchange |
| 3 | CheckPoint FW |
| 3 | gordano |
| 2 | Spamfilter ISP |
| 2 | Code-Crafters |
| 2 | DeskNow |
| 2 | Eudora |
| 2 | Argosoft NT |
| 2 | XMail |
| 2 | stalker |
| 1 | WinRoute |
| 1 | mercur |
| 1 | VHCS |
| 1 | postoffice |
| 1 | Sun JSMS |
| 1 | SonicWALL |
| 1 | Scalix |
| 1 | Novell Groupwise |
| 1 | Hexamail |
| 1 | imail |
| 10972 | TOTAL |