| Count | MTA |
|---|---|
| 9333 | MS Exchange |
| 7330 | postfix |
| 5309 | Exim |
| 3179 | blocked |
| 1542 | unknown |
| 999 | sendmail |
| 869 | qmail |
| 459 | Cisco |
| 353 | mdaemon |
| 249 | Kerio |
| 185 | PowerMTA |
| 179 | barracuda |
| 144 | XWall/Exchange |
| 101 | eSafe |
| 98 | MailEnable |
| 93 | SurgeSMTP |
| 65 | imail |
| 64 | rblsmtpd |
| 54 | David |
| 46 | SonicWALL |
| 42 | qpsmtpd |
| 37 | Lotus Domino |
| 31 | TrendMicro Reputation |
| 31 | communigate |
| 31 | Sophos |
| 26 | IceWarp |
| 18 | Mercury |
| 15 | Scalix |
| 15 | XMail |
| 15 | firstclass |
| 12 | Novell Groupwise |
| 12 | Spamfilter ISP |
| 10 | ntmail |
| 9 | mercur |
| 8 | Argosoft NT |
| 7 | hmailserver |
| 7 | stalker |
| 6 | Eudora |
| 3 | merak |
| 3 | Python SMTP |
| 3 | expurgate |
| 3 | SMTPBeamer |
| 3 | MIMESWeeper |
| 2 | vpop3 |
| 2 | james |
| 2 | Hexamail |
| 2 | Novonyx |
| 2 | DeskNow |
| 1 | teles |
| 1 | webcrossing |
| 1 | Winmail |
| 1 | Code-Crafters |
| 1 | assp |
| 1 | Windows Sendmail |
| 1 | VMS SMTP-OpenVMS |
| 1 | VHCS |
| 1 | dynfx |
| 1 | Symantec AVGate |
| 1 | iPlanet |
| 1 | mailmarshal |
| 1 | Mailtraq |
| 1 | MailSite |
| 1 | obtuse |
| 1 | Lyris |
| 31024 | TOTAL |