| Count | MTA |
|---|---|
| 123044 | postfix |
| 22540 | blocked |
| 17458 | sendmail |
| 15326 | Exim |
| 14662 | MS Exchange |
| 13478 | unknown |
| 9256 | qmail |
| 2108 | MailEnable |
| 1340 | Cisco |
| 1173 | eSafe |
| 1071 | mdaemon |
| 864 | rblsmtpd |
| 493 | qpsmtpd |
| 367 | Kerio |
| 347 | MailInBlack |
| 269 | EMailArchitect |
| 258 | barracuda |
| 226 | Sophos |
| 191 | Lotus Domino |
| 159 | IceWarp |
| 130 | CheckPoint FW |
| 124 | PowerMTA |
| 114 | TrendMicro Reputation |
| 106 | communigate |
| 63 | XMail |
| 59 | SonicWALL |
| 56 | Python SMTP |
| 46 | imail |
| 44 | hmailserver |
| 43 | Mercury |
| 36 | james |
| 35 | Argosoft NT |
| 21 | mirapoint |
| 21 | Eudora |
| 18 | SurgeSMTP |
| 17 | merak |
| 9 | gordano |
| 9 | VHCS |
| 9 | stalker |
| 8 | Code-Crafters |
| 8 | modusMail |
| 6 | firstclass |
| 5 | InterScan |
| 4 | mercur |
| 4 | Lotus Notes |
| 4 | DeskNow |
| 4 | Symantec AVGate |
| 4 | mailmarshal |
| 3 | Novell Groupwise |
| 3 | Spamfilter ISP |
| 3 | spamsniper |
| 3 | Mailtraq |
| 2 | Winmail |
| 2 | MailSite |
| 2 | MIMESWeeper |
| 2 | UNIX smap |
| 2 | dmail |
| 2 | netscape |
| 2 | CCProxy |
| 1 | F-Secure |
| 1 | coremail |
| 1 | XWall/Exchange |
| 1 | MacOS QuickMail |
| 1 | Windows NAI WebShield |
| 1 | vpop3 |
| 1 | Windows Floosietek FTGate |
| 1 | David |
| 1 | WinWebMail |
| 1 | CMailServer |
| 1 | MailMax |
| 1 | slmail |
| 1 | VMS_PMDF |
| 1 | 1st SMTP |
| 1 | internetanywhere |
| 1 | extremail |
| 225679 | TOTAL |