| Count | MTA |
|---|---|
| 27928 | postfix |
| 9750 | MS Exchange |
| 7289 | Exim |
| 7287 | blocked |
| 4376 | unknown |
| 4255 | qmail |
| 3730 | sendmail |
| 2934 | mdaemon |
| 2857 | MailEnable |
| 2132 | eSafe |
| 1242 | qpsmtpd |
| 1180 | Cisco |
| 809 | Kerio |
| 483 | Sophos |
| 437 | imail |
| 294 | IceWarp |
| 269 | Lotus Domino |
| 263 | rblsmtpd |
| 180 | barracuda |
| 142 | communigate |
| 101 | TrendMicro Reputation |
| 61 | XMail |
| 57 | PowerMTA |
| 49 | Argosoft NT |
| 39 | hmailserver |
| 39 | Eudora |
| 39 | DeskNow |
| 36 | SonicWALL |
| 31 | Hexamail |
| 24 | james |
| 23 | David |
| 22 | stalker |
| 21 | Spamfilter ISP |
| 21 | merak |
| 20 | XWall/Exchange |
| 19 | Symantec AVGate |
| 13 | firstclass |
| 13 | MailSite |
| 11 | Mercury |
| 9 | VMS_PMDF |
| 8 | InterScan |
| 8 | CMailServer |
| 7 | modusMail |
| 6 | inet |
| 6 | Code-Crafters |
| 6 | Novell Groupwise |
| 5 | EMailArchitect |
| 5 | Mailtraq |
| 4 | Winmail |
| 3 | VHCS |
| 3 | SurgeSMTP |
| 3 | $1 |
| 2 | AS/400 IBM SMTP |
| 2 | Sun JSMS |
| 2 | Scalix |
| 2 | Python SMTP |
| 2 | netscape |
| 2 | postoffice |
| 2 | coremail |
| 1 | vpop3 |
| 1 | mercur |
| 1 | MailMax |
| 1 | Windows Floosietek FTGate |
| 1 | CheckPoint FW |
| 1 | spamsniper |
| 1 | Ocean Mail |
| 1 | CCProxy |
| 1 | Novonyx |
| 78572 | TOTAL |