| Count | MTA |
|---|---|
| 4076 | MS Exchange |
| 2936 | postfix |
| 1204 | blocked |
| 984 | unknown |
| 879 | Exim |
| 373 | sendmail |
| 291 | MailEnable |
| 218 | mailmarshal |
| 157 | mdaemon |
| 113 | qmail |
| 108 | Cisco |
| 106 | eSafe |
| 101 | qpsmtpd |
| 66 | Kerio |
| 24 | rblsmtpd |
| 24 | barracuda |
| 17 | Sophos |
| 16 | SurgeSMTP |
| 16 | Mercury |
| 9 | Lotus Domino |
| 7 | XWall/Exchange |
| 6 | james |
| 6 | hmailserver |
| 4 | Hurricane |
| 3 | VMS_PMDF |
| 3 | Eudora |
| 3 | TrendMicro Reputation |
| 2 | firstclass |
| 2 | XMail |
| 2 | DeskNow |
| 2 | MIMESWeeper |
| 2 | SonicWALL |
| 2 | communigate |
| 1 | Mailtraq |
| 1 | MailSite |
| 1 | Spamfilter ISP |
| 1 | Argosoft NT |
| 1 | Lyris |
| 1 | IceWarp |
| 1 | modusMail |
| 1 | Hexamail |
| 1 | Code-Crafters |
| 1 | CheckPoint FW |
| 1 | spamsniper |
| 1 | stalker |
| 1 | vpop3 |
| 1 | CMailServer |
| 11776 | TOTAL |