| Count | MTA |
|---|---|
| 77510 | postfix |
| 57378 | Exim |
| 23480 | MS Exchange |
| 15979 | unknown |
| 8382 | blocked |
| 6760 | qmail |
| 4810 | sendmail |
| 2997 | MailEnable |
| 1340 | rblsmtpd |
| 1250 | Cisco |
| 900 | Kerio |
| 660 | barracuda |
| 455 | eSafe |
| 444 | mdaemon |
| 231 | qpsmtpd |
| 154 | communigate |
| 119 | IceWarp |
| 112 | mailmarshal |
| 100 | Lotus Domino |
| 96 | XMail |
| 79 | TrendMicro Reputation |
| 61 | XWall/Exchange |
| 57 | Mercury |
| 51 | Python SMTP |
| 49 | Sophos |
| 42 | PowerMTA |
| 41 | SonicWALL |
| 39 | imail |
| 34 | Hexamail |
| 26 | Argosoft NT |
| 26 | hmailserver |
| 20 | stalker |
| 19 | Mailtraq |
| 17 | SurgeSMTP |
| 15 | Hurricane |
| 14 | EMailArchitect |
| 14 | Lotus Notes |
| 13 | Novell Groupwise |
| 12 | Spamfilter ISP |
| 12 | james |
| 10 | MailSite |
| 10 | merak |
| 10 | Scalix |
| 8 | coremail |
| 7 | Eudora |
| 7 | David |
| 6 | Lyris |
| 5 | DeskNow |
| 5 | Code-Crafters |
| 5 | Symantec AVGate |
| 5 | vpop3 |
| 4 | modusMail |
| 4 | CheckPoint FW |
| 3 | Net::SMTP::Server |
| 3 | Windows NAI WebShield |
| 3 | InterScan |
| 2 | spamd |
| 2 | MailMax |
| 2 | Novonyx |
| 2 | MIMESWeeper |
| 2 | VHCS |
| 1 | RaidenMAILD |
| 1 | Ocean Mail |
| 1 | UCEPROTECT |
| 1 | Wildcat |
| 1 | Windows Floosietek FTGate |
| 1 | Winmail |
| 1 | expurgate |
| 1 | firstclass |
| 1 | webcrossing |
| 1 | SMTPBeamer |
| 203913 | TOTAL |