| Count | MTA |
|---|---|
| 18163 | Exim |
| 5950 | unknown |
| 5043 | postfix |
| 4420 | qmail |
| 1037 | blocked |
| 815 | sendmail |
| 541 | MS Exchange |
| 153 | rblsmtpd |
| 88 | PowerMTA |
| 82 | Cisco |
| 71 | qpsmtpd |
| 65 | mdaemon |
| 47 | Kerio |
| 43 | MailEnable |
| 31 | communigate |
| 29 | barracuda |
| 11 | Novell Groupwise |
| 8 | Mercury |
| 7 | XMail |
| 7 | Lotus Domino |
| 7 | eSafe |
| 7 | stalker |
| 6 | IceWarp |
| 4 | hmailserver |
| 4 | imail |
| 4 | SonicWALL |
| 2 | james |
| 2 | Python SMTP |
| 2 | CMailServer |
| 2 | DeskNow |
| 1 | SurgeSMTP |
| 1 | firstclass |
| 1 | VHCS |
| 1 | extremail |
| 1 | Sophos |
| 36656 | TOTAL |