| Count | MTA |
|---|---|
| 31771 | unknown |
| 12447 | Exim |
| 12104 | postfix |
| 5074 | sendmail |
| 1842 | blocked |
| 1321 | MS Exchange |
| 1127 | qmail |
| 1019 | Cisco |
| 403 | rblsmtpd |
| 377 | MailEnable |
| 160 | mdaemon |
| 112 | PowerMTA |
| 83 | qpsmtpd |
| 82 | hmailserver |
| 79 | XMail |
| 46 | IceWarp |
| 46 | barracuda |
| 37 | eSafe |
| 27 | Kerio |
| 23 | Lotus Domino |
| 17 | communigate |
| 12 | Mercury |
| 9 | Code-Crafters |
| 5 | Argosoft NT |
| 4 | David |
| 4 | SonicWALL |
| 3 | james |
| 2 | UNIX Zmailer |
| 2 | merak |
| 2 | Novell Groupwise |
| 2 | Spamfilter ISP |
| 2 | Python SMTP |
| 1 | DeskNow |
| 1 | stalker |
| 1 | TrendMicro Reputation |
| 1 | CMailServer |
| 1 | SurgeSMTP |
| 1 | Sophos |
| 1 | Scalix |
| 1 | mailmarshal |
| 1 | MailSite |
| 1 | Lyris |
| 1 | F-Secure |
| 68255 | TOTAL |