| Count | MTA |
|---|---|
| 12586 | postfix |
| 8606 | Exim |
| 8134 | MS Exchange |
| 5394 | blocked |
| 2248 | qmail |
| 1649 | unknown |
| 970 | sendmail |
| 423 | stalker |
| 391 | Kerio |
| 374 | barracuda |
| 362 | MailEnable |
| 351 | Cisco |
| 279 | eSafe |
| 223 | mdaemon |
| 118 | imail |
| 110 | XWall/Exchange |
| 79 | IceWarp |
| 73 | communigate |
| 58 | SonicWALL |
| 58 | rblsmtpd |
| 42 | TrendMicro Reputation |
| 41 | Lotus Domino |
| 36 | qpsmtpd |
| 34 | David |
| 32 | XMail |
| 29 | Argosoft NT |
| 18 | SurgeSMTP |
| 18 | MailSite |
| 16 | Mercury |
| 14 | Sophos |
| 13 | smoothwall |
| 12 | PowerMTA |
| 10 | james |
| 10 | UNIX RS |
| 9 | mercur |
| 9 | Eudora |
| 7 | expurgate |
| 6 | mailmarshal |
| 6 | DeskNow |
| 5 | hmailserver |
| 5 | Hexamail |
| 5 | Novell Groupwise |
| 4 | postoffice |
| 4 | CheckPoint FW |
| 4 | EMailArchitect |
| 4 | MailInBlack |
| 3 | Scalix |
| 3 | Mailtraq |
| 3 | Lyris |
| 3 | modusMail |
| 3 | merak |
| 2 | Spamfilter ISP |
| 2 | UCEPROTECT |
| 1 | lsmtp |
| 1 | Symantec AVGate |
| 1 | SMTPBeamer |
| 1 | VHCS |
| 1 | Wildcat |
| 1 | WinWebMail |
| 1 | Winmail |
| 1 | Python SMTP |
| 1 | assp |
| 1 | firstclass |
| 1 | gordano |
| 1 | hamster |
| 1 | MacOS QuickMail |
| 1 | MIMESWeeper |
| 1 | vpop3 |
| 42913 | TOTAL |