| Count | MTA |
|---|---|
| 1605 | qmail |
| 1603 | postfix |
| 203 | blocked |
| 163 | MS Exchange |
| 107 | unknown |
| 83 | Cisco |
| 56 | Exim |
| 36 | mdaemon |
| 27 | sendmail |
| 22 | eSafe |
| 21 | MailEnable |
| 14 | barracuda |
| 13 | MailSite |
| 9 | Kerio |
| 8 | communigate |
| 6 | Mercury |
| 5 | IceWarp |
| 5 | rblsmtpd |
| 5 | imail |
| 3 | qpsmtpd |
| 2 | Lotus Domino |
| 1 | SurgeSMTP |
| 1 | TrendMicro Reputation |
| 1 | lsmtp |
| 1 | Winmail |
| 1 | SonicWALL |
| 1 | Lyris |
| 4002 | TOTAL |