| Count | MTA |
|---|---|
| 10610 | postfix |
| 5992 | Exim |
| 5518 | MS Exchange |
| 3445 | blocked |
| 2378 | CheckPoint FW |
| 1916 | unknown |
| 1857 | sendmail |
| 642 | qmail |
| 569 | Cisco |
| 391 | mdaemon |
| 277 | eSafe |
| 180 | PowerMTA |
| 159 | MailEnable |
| 155 | Kerio |
| 122 | MailInBlack |
| 69 | IceWarp |
| 49 | imail |
| 48 | Lotus Domino |
| 41 | firstclass |
| 40 | qpsmtpd |
| 40 | barracuda |
| 31 | rblsmtpd |
| 25 | communigate |
| 23 | Eudora |
| 22 | Mercury |
| 22 | james |
| 18 | stalker |
| 16 | XMail |
| 15 | TrendMicro Reputation |
| 14 | Argosoft NT |
| 12 | Sophos |
| 11 | hmailserver |
| 10 | merak |
| 9 | Hurricane |
| 9 | Halon |
| 9 | SurgeSMTP |
| 8 | SonicWALL |
| 7 | RaidenMAILD |
| 7 | XWall/Exchange |
| 6 | Scalix |
| 5 | MailSite |
| 5 | mailmarshal |
| 5 | DeskNow |
| 4 | Code-Crafters |
| 4 | mercur |
| 3 | Spamfilter ISP |
| 3 | F-Secure |
| 3 | Lyris |
| 3 | Novell Groupwise |
| 3 | Python SMTP |
| 2 | Winmail |
| 2 | postoffice |
| 2 | spamd |
| 1 | WinWebMail |
| 1 | WinRoute |
| 1 | VopMail |
| 1 | $1 |
| 1 | modusMail |
| 1 | Net::SMTP::Server |
| 1 | MessageWall |
| 1 | MacOS QuickMail |
| 1 | Hexamail |
| 1 | David |
| 1 | CMailServer |
| 1 | vpop3 |
| 1 | gordano |
| 1 | CMS IBM VM SMTP |
| 1 | ims |
| 1 | Windows Floosietek FTGate |
| 34832 | TOTAL |