| Count | MTA |
|---|---|
| 756 | MS Exchange |
| 323 | blocked |
| 199 | postfix |
| 187 | Exim |
| 78 | Cisco |
| 78 | qmail |
| 65 | unknown |
| 32 | sendmail |
| 25 | Kerio |
| 25 | CCProxy |
| 24 | mdaemon |
| 23 | imail |
| 22 | MailEnable |
| 19 | eSafe |
| 15 | barracuda |
| 6 | Lotus Domino |
| 4 | SonicWALL |
| 3 | qpsmtpd |
| 2 | communigate |
| 2 | assp |
| 2 | Code-Crafters |
| 2 | rblsmtpd |
| 2 | stalker |
| 1 | Softalk |
| 1 | XMail |
| 1 | vpop3 |
| 1 | iPlanet |
| 1 | Spamfilter ISP |
| 1 | merak |
| 1 | IceWarp |
| 1901 | TOTAL |