| Count | MTA |
|---|---|
| 833 | MS Exchange |
| 541 | unknown |
| 482 | postfix |
| 200 | blocked |
| 76 | Cisco |
| 69 | eSafe |
| 53 | sendmail |
| 36 | Exim |
| 23 | barracuda |
| 15 | qmail |
| 13 | MailEnable |
| 11 | Lotus Domino |
| 10 | mdaemon |
| 8 | communigate |
| 6 | TrendMicro Reputation |
| 4 | rblsmtpd |
| 3 | Kerio |
| 2 | IceWarp |
| 2 | dmail |
| 2 | qpsmtpd |
| 2 | InterScan |
| 2 | Novell Groupwise |
| 1 | assp |
| 1 | XMail |
| 1 | Sophos |
| 1 | firstclass |
| 1 | mailmarshal |
| 1 | AS/400 IBM SMTP |
| 2399 | TOTAL |