| Count | MTA |
|---|---|
| 250701 | qmail |
| 234355 | postfix |
| 127431 | blocked |
| 114057 | HINES |
| 57723 | sendmail |
| 6406 | unknown |
| 5555 | Exim |
| 2086 | MS Exchange |
| 1692 | XMail |
| 1317 | Cisco |
| 771 | imail |
| 761 | barracuda |
| 710 | rblsmtpd |
| 417 | MailEnable |
| 397 | ExpressMail |
| 381 | eSafe |
| 336 | postoffice |
| 312 | TrendMicro Reputation |
| 232 | Lotus Domino |
| 205 | Argosoft NT |
| 193 | mdaemon |
| 138 | PowerMTA |
| 114 | james |
| 98 | Mercury |
| 66 | gordano |
| 64 | qpsmtpd |
| 52 | CheckPoint FW |
| 46 | mirapoint |
| 44 | InterScan |
| 42 | firstclass |
| 39 | SPA-PRO mail |
| 32 | Eudora |
| 28 | Symantec AVGate |
| 26 | Windows Sendmail |
| 21 | Sophos |
| 16 | communigate |
| 12 | RaidenMAILD |
| 12 | Kerio |
| 12 | Kirium Mail Server |
| 10 | Windows NAI WebShield |
| 9 | SonicWALL |
| 8 | stalker |
| 8 | Winmail |
| 7 | Lyris |
| 5 | IceWarp |
| 4 | mailmarshal |
| 4 | ntmail |
| 4 | merak |
| 3 | assp |
| 3 | Scalix |
| 3 | coremail |
| 3 | WinWebMail |
| 3 | hmailserver |
| 2 | ims |
| 2 | intermail |
| 2 | CCProxy |
| 2 | XWall/Exchange |
| 2 | Net::SMTP::Server |
| 2 | UNIX/Windows Lotus SMTP MTA |
| 1 | AS/400 IBM SMTP |
| 1 | Sun JSMS |
| 1 | SurgeSMTP |
| 1 | UNIX smap |
| 1 | $1 |
| 1 | appleshare |
| 1 | Python SMTP |
| 1 | MuseMail |
| 1 | MIMESWeeper |
| 1 | iPlanet |
| 1 | Hurricane |
| 1 | EMailArchitect |
| 1 | DefenderMX |
| 1 | CMailServer |
| 1 | spamsniper |
| 1 | webcrossing |
| 1 | webstar |
| 807003 | TOTAL |