| Count | MTA |
|---|---|
| 6618 | Exim |
| 3883 | qmail |
| 1566 | unknown |
| 1271 | postfix |
| 639 | blocked |
| 600 | PowerMTA |
| 454 | imail |
| 207 | MS Exchange |
| 127 | MailEnable |
| 72 | sendmail |
| 55 | barracuda |
| 36 | communigate |
| 25 | eSafe |
| 19 | mdaemon |
| 16 | Cisco |
| 15 | qpsmtpd |
| 7 | Kerio |
| 5 | DeskNow |
| 4 | rblsmtpd |
| 3 | mailmarshal |
| 3 | IceWarp |
| 3 | TrendMicro Reputation |
| 3 | Lotus Domino |
| 2 | Novell Groupwise |
| 1 | XMail |
| 1 | Scalix |
| 1 | SurgeSMTP |
| 1 | WinWebMail |
| 1 | Winmail |
| 1 | stalker |
| 1 | teles |
| 1 | assp |
| 15641 | TOTAL |