| Count | MTA |
|---|---|
| 336 | MS Exchange |
| 87 | blocked |
| 76 | postfix |
| 56 | Exim |
| 36 | eSafe |
| 33 | unknown |
| 23 | Cisco |
| 19 | sendmail |
| 17 | qmail |
| 17 | qpsmtpd |
| 14 | barracuda |
| 12 | imail |
| 5 | MailEnable |
| 5 | inscitek |
| 2 | mirapoint |
| 2 | communigate |
| 2 | Python SMTP |
| 1 | IceWarp |
| 1 | SonicWALL |
| 1 | Sophos |
| 1 | Sun JSMS |
| 1 | Symantec AVGate |
| 1 | assp |
| 1 | Novell Groupwise |
| 1 | mailmarshal |
| 1 | mdaemon |
| 1 | Scalix |
| 752 | TOTAL |