| Count | MTA |
|---|---|
| 15017 | postfix |
| 11729 | MS Exchange |
| 9920 | blocked |
| 9183 | unknown |
| 7681 | sendmail |
| 5067 | Exim |
| 3606 | Winmail |
| 3414 | WinWebMail |
| 2081 | coremail |
| 2065 | mdaemon |
| 2023 | Cisco |
| 1078 | barracuda |
| 777 | Lotus Domino |
| 727 | qmail |
| 468 | imail |
| 357 | hmailserver |
| 283 | waurkmail |
| 273 | CMailServer |
| 233 | james |
| 230 | Kerio |
| 222 | MailEnable |
| 143 | eSafe |
| 126 | CCProxy |
| 112 | Mercury |
| 100 | Cellopoint |
| 88 | IceWarp |
| 80 | Sophos |
| 77 | RaidenMAILD |
| 73 | MuseMail |
| 68 | TrendMicro Reputation |
| 47 | mirapoint |
| 38 | XMail |
| 31 | Argosoft NT |
| 29 | merak |
| 21 | assp |
| 19 | rblsmtpd |
| 17 | communigate |
| 8 | formail |
| 8 | InterScan |
| 8 | $1 |
| 6 | qpsmtpd |
| 5 | Symantec AVGate |
| 4 | SmartFilter |
| 4 | stalker |
| 3 | MikroTik |
| 3 | vpop3 |
| 3 | MIMESWeeper |
| 2 | Sun JSMS |
| 2 | VisNetic |
| 2 | Spamfilter ISP |
| 2 | Novell Groupwise |
| 2 | MailSite |
| 2 | inscitek |
| 2 | Code-Crafters |
| 1 | MailNow |
| 1 | DeskNow |
| 1 | David |
| 1 | iPlanet |
| 1 | Python SMTP |
| 1 | UNIX Zmailer |
| 1 | slmail |
| 1 | XWall/Exchange |
| 1 | SonicWALL |
| 1 | CheckPoint FW |
| 1 | mailmarshal |
| 77580 | TOTAL |