| Count | MTA |
|---|---|
| 42192 | unknown |
| 35064 | postfix |
| 9832 | blocked |
| 8597 | qmail |
| 7670 | Exim |
| 4054 | MS Exchange |
| 2111 | MailEnable |
| 2041 | rblsmtpd |
| 1045 | mdaemon |
| 770 | sendmail |
| 317 | Cisco |
| 239 | eSafe |
| 158 | barracuda |
| 132 | Lotus Domino |
| 85 | PowerMTA |
| 78 | IceWarp |
| 74 | Argosoft NT |
| 64 | hmailserver |
| 56 | Kerio |
| 53 | Sophos |
| 53 | imail |
| 51 | TrendMicro Reputation |
| 42 | qpsmtpd |
| 39 | SonicWALL |
| 33 | XMail |
| 31 | Lotus Notes |
| 25 | Mercury |
| 21 | mailmarshal |
| 21 | communigate |
| 20 | merak |
| 15 | XWall/Exchange |
| 14 | Novell Groupwise |
| 12 | EMailArchitect |
| 10 | james |
| 10 | SurgeSMTP |
| 7 | Lyris |
| 6 | stalker |
| 6 | Winmail |
| 5 | MailSite |
| 4 | Spamfilter ISP |
| 4 | Sun JSMS |
| 4 | VMS_PMDF |
| 3 | DeskNow |
| 3 | Cast-Info.ES |
| 3 | Eudora |
| 3 | Symantec AVGate |
| 3 | InterScan |
| 3 | Ocean Mail |
| 2 | mercur |
| 2 | netscape |
| 2 | $1 |
| 2 | Mailtraq |
| 2 | Windows NAI WebShield |
| 2 | Hexamail |
| 2 | RaidenMAILD |
| 2 | Code-Crafters |
| 2 | CheckPoint FW |
| 2 | spamsniper |
| 2 | vpop3 |
| 1 | Python SMTP |
| 1 | CCProxy |
| 1 | slmail |
| 1 | VHCS |
| 1 | postoffice |
| 1 | AS/400 IBM SMTP |
| 1 | MikroTik |
| 115112 | TOTAL |