| Count | MTA |
|---|---|
| 77603 | postfix |
| 52154 | MS Exchange |
| 36531 | unknown |
| 30901 | Exim |
| 11881 | blocked |
| 10277 | MailEnable |
| 8172 | qmail |
| 5105 | sendmail |
| 2608 | Cisco |
| 1777 | eSafe |
| 1545 | mdaemon |
| 891 | rblsmtpd |
| 757 | barracuda |
| 716 | PowerMTA |
| 572 | Kerio |
| 467 | Sophos |
| 371 | qpsmtpd |
| 333 | vpop3 |
| 251 | mailmarshal |
| 191 | communigate |
| 187 | hmailserver |
| 182 | Lotus Domino |
| 160 | IceWarp |
| 132 | SurgeSMTP |
| 122 | SonicWALL |
| 86 | XMail |
| 83 | Mercury |
| 81 | Lyris |
| 63 | Argosoft NT |
| 58 | Code-Crafters |
| 51 | XWall/Exchange |
| 51 | Hexamail |
| 49 | TrendMicro Reputation |
| 46 | imail |
| 43 | Mailtraq |
| 36 | merak |
| 34 | james |
| 30 | Efinity |
| 27 | Hurricane |
| 26 | MailSite |
| 22 | firstclass |
| 20 | Novell Groupwise |
| 17 | DeskNow |
| 16 | stalker |
| 13 | smoothwall |
| 11 | Scalix |
| 11 | Eudora |
| 9 | Winmail |
| 8 | EMailArchitect |
| 8 | David |
| 8 | mirapoint |
| 7 | interchange |
| 7 | Python SMTP |
| 6 | MIMESWeeper |
| 6 | InterScan |
| 5 | VHCS |
| 5 | Windows NAI WebShield |
| 5 | assp |
| 5 | Spamfilter ISP |
| 5 | Softalk |
| 5 | $1 |
| 4 | Symantec AVGate |
| 4 | Windows Floosietek FTGate |
| 4 | obtuse |
| 4 | modusMail |
| 4 | CCProxy |
| 4 | MailMax |
| 3 | dmail |
| 3 | mailshield |
| 3 | UNIX Zmailer |
| 3 | postoffice |
| 3 | VMS_PMDF |
| 3 | CheckPoint FW |
| 2 | WinWebMail |
| 1 | MacOS QuickMail |
| 1 | CMailServer |
| 1 | UNIX smap |
| 1 | extremail |
| 1 | nplex |
| 1 | expurgate |
| 1 | ecelerity |
| 1 | CMS IBM VM SMTP |
| 1 | Halon |
| 1 | raptor |
| 1 | DefenderMX |
| 1 | coremail |
| 1 | webcrossing |
| 1 | spamd |
| 1 | SMTPBeamer |
| 1 | UNIX InterMail |
| 1 | Net::SMTP::Server |
| 1 | lsmtp |
| 1 | spamsniper |
| 1 | gordano |
| 244913 | TOTAL |