| Count | MTA |
|---|---|
| 407 | postfix |
| 307 | MS Exchange |
| 255 | mdaemon |
| 106 | Cisco |
| 83 | blocked |
| 60 | unknown |
| 59 | Exim |
| 24 | qpsmtpd |
| 18 | qmail |
| 12 | sendmail |
| 4 | eSafe |
| 4 | MailEnable |
| 3 | barracuda |
| 3 | mailmarshal |
| 3 | Sophos |
| 2 | Sun JSMS |
| 2 | Lotus Domino |
| 2 | Kerio |
| 1 | SurgeSMTP |
| 1 | IceWarp |
| 1 | Mercury |
| 1 | Novell Groupwise |
| 1 | Scalix |
| 1 | CCProxy |
| 1 | XWall/Exchange |
| 1 | imail |
| 1 | james |
| 1363 | TOTAL |