| Count | MTA |
|---|---|
| 6634 | postfix |
| 4249 | MS Exchange |
| 1895 | blocked |
| 1771 | unknown |
| 1378 | Exim |
| 718 | qmail |
| 604 | Cisco |
| 230 | sendmail |
| 196 | barracuda |
| 191 | MailEnable |
| 146 | PowerMTA |
| 117 | IceWarp |
| 87 | qpsmtpd |
| 63 | mdaemon |
| 61 | eSafe |
| 61 | Kerio |
| 55 | rblsmtpd |
| 34 | Lotus Domino |
| 29 | Hurricane |
| 29 | Argosoft NT |
| 21 | merak |
| 17 | hmailserver |
| 16 | Mercury |
| 16 | TrendMicro Reputation |
| 15 | firstclass |
| 14 | gordano |
| 14 | imail |
| 12 | EMailArchitect |
| 11 | XMail |
| 9 | XWall/Exchange |
| 8 | DeskNow |
| 8 | communigate |
| 7 | Spamfilter ISP |
| 7 | vpop3 |
| 4 | james |
| 4 | SonicWALL |
| 4 | stalker |
| 3 | Sophos |
| 2 | Code-Crafters |
| 2 | Symantec AVGate |
| 2 | SurgeSMTP |
| 2 | mailmarshal |
| 2 | Novell Groupwise |
| 2 | mercur |
| 2 | Winmail |
| 1 | Softalk |
| 1 | Hexamail |
| 1 | RaidenMAILD |
| 1 | CheckPoint FW |
| 1 | Eudora |
| 1 | Net::SMTP::Server |
| 1 | MailSite |
| 1 | WinWebMail |
| 1 | extremail |
| 1 | VMS_PMDF |
| 1 | MailMax |
| 1 | Lyris |
| 1 | Windows Floosietek FTGate |
| 18765 | TOTAL |