| Count | MTA |
|---|---|
| 29208 | MS Exchange |
| 17827 | Exim |
| 14770 | postfix |
| 6648 | blocked |
| 6058 | unknown |
| 2866 | MailEnable |
| 1871 | sendmail |
| 1531 | qmail |
| 1184 | eSafe |
| 905 | rblsmtpd |
| 680 | Cisco |
| 543 | mdaemon |
| 425 | qpsmtpd |
| 291 | Kerio |
| 213 | barracuda |
| 206 | Sophos |
| 193 | mailmarshal |
| 143 | PowerMTA |
| 92 | SurgeSMTP |
| 74 | TrendMicro Reputation |
| 59 | Lotus Domino |
| 47 | Hexamail |
| 46 | XWall/Exchange |
| 35 | james |
| 34 | Mercury |
| 31 | imail |
| 28 | IceWarp |
| 23 | XMail |
| 21 | communigate |
| 21 | postoffice |
| 20 | Code-Crafters |
| 18 | Argosoft NT |
| 12 | SonicWALL |
| 12 | hmailserver |
| 11 | MailSite |
| 11 | merak |
| 10 | smoothwall |
| 7 | modusMail |
| 6 | Winmail |
| 5 | Mailtraq |
| 5 | Python SMTP |
| 5 | vpop3 |
| 4 | InterScan |
| 4 | mirapoint |
| 4 | $1 |
| 4 | Novell Groupwise |
| 4 | obtuse |
| 3 | UNIX InterMail |
| 3 | Scalix |
| 3 | infusion |
| 3 | MIMESWeeper |
| 3 | Lyris |
| 3 | DeskNow |
| 3 | stalker |
| 2 | Softalk |
| 2 | CheckPoint FW |
| 2 | VMS_PMDF |
| 2 | firstclass |
| 2 | VisNetic |
| 2 | Ocean Mail |
| 2 | Eudora |
| 2 | CMailServer |
| 1 | VHCS |
| 1 | RaidenMAILD |
| 1 | spamd |
| 1 | coremail |
| 1 | inscitek |
| 1 | SMTPBeamer |
| 1 | Spamfilter ISP |
| 1 | Sun JSMS |
| 1 | WinWebMail |
| 1 | UNIX smap |
| 1 | vmsmx |
| 1 | raptor |
| 86264 | TOTAL |