| Count | MTA |
|---|---|
| 394 | MS Exchange |
| 131 | blocked |
| 80 | Cisco |
| 65 | Exim |
| 62 | unknown |
| 61 | mdaemon |
| 45 | postfix |
| 42 | sendmail |
| 29 | barracuda |
| 19 | eSafe |
| 7 | Kerio |
| 6 | MailEnable |
| 3 | TrendMicro Reputation |
| 2 | $1 |
| 2 | Sun JSMS |
| 2 | mailmarshal |
| 2 | modusMail |
| 1 | communigate |
| 1 | SonicWALL |
| 1 | IceWarp |
| 1 | Mercury |
| 1 | Argosoft NT |
| 1 | Lotus Domino |
| 1 | VisNetic |
| 1 | SurgeSMTP |
| 960 | TOTAL |