| Count | MTA |
|---|---|
| 60721 | Exim |
| 42331 | postfix |
| 27665 | unknown |
| 14516 | qmail |
| 11451 | sendmail |
| 11259 | blocked |
| 10763 | MS Exchange |
| 4078 | mdaemon |
| 1378 | Cisco |
| 1058 | communigate |
| 1003 | Kerio |
| 184 | Lotus Domino |
| 183 | stalker |
| 176 | MailEnable |
| 138 | UserGate |
| 107 | Eserv |
| 103 | Mercury |
| 99 | eSafe |
| 97 | XMail |
| 74 | qpsmtpd |
| 70 | rblsmtpd |
| 61 | PowerMTA |
| 48 | barracuda |
| 45 | IceWarp |
| 38 | hmailserver |
| 33 | WinRoute |
| 32 | TrendMicro Reputation |
| 29 | TrafficInspector |
| 29 | ModusMail |
| 24 | Hurricane |
| 19 | imail |
| 18 | obtuse |
| 17 | XWall/Exchange |
| 9 | Argosoft NT |
| 8 | merak |
| 6 | Python SMTP |
| 6 | Novell Groupwise |
| 5 | SurgeSMTP |
| 5 | UNIX Zmailer |
| 5 | CheckPoint FW |
| 5 | spamd |
| 4 | MailSite |
| 4 | james |
| 3 | Winmail |
| 3 | mailmarshal |
| 3 | Spamfilter ISP |
| 3 | mercur |
| 3 | nplex |
| 3 | CCProxy |
| 1 | Hexamail |
| 1 | MessageWall |
| 1 | David |
| 1 | $1 |
| 1 | Scalix |
| 1 | vpop3 |
| 1 | CMailServer |
| 1 | F-Secure |
| 1 | SENDMAILER |
| 1 | MIMESWeeper |
| 1 | gordano |
| 1 | MailQ |
| 1 | Sun JSMS |
| 1 | Windows Sendmail |
| 1 | slmail |
| 187937 | TOTAL |