| Count | MTA |
|---|---|
| 8224 | Exim |
| 4175 | MS Exchange |
| 3726 | qmail |
| 3551 | postfix |
| 3173 | unknown |
| 2199 | blocked |
| 1312 | sendmail |
| 225 | mdaemon |
| 217 | MailEnable |
| 143 | Cisco |
| 135 | qpsmtpd |
| 55 | Kerio |
| 49 | mailmarshal |
| 37 | eSafe |
| 32 | IceWarp |
| 25 | Lotus Domino |
| 20 | rblsmtpd |
| 18 | XMail |
| 14 | barracuda |
| 13 | Sophos |
| 13 | TrendMicro Reputation |
| 9 | CheckPoint FW |
| 8 | james |
| 7 | communigate |
| 7 | merak |
| 5 | SurgeSMTP |
| 5 | Novell Groupwise |
| 4 | Argosoft NT |
| 4 | Spamfilter ISP |
| 3 | Symantec AVGate |
| 3 | Mercury |
| 3 | Scalix |
| 3 | Softalk |
| 3 | SonicWALL |
| 3 | imail |
| 3 | stalker |
| 3 | vpop3 |
| 2 | spamsniper |
| 2 | MailSite |
| 2 | Winmail |
| 2 | Lyris |
| 1 | modusMail |
| 1 | InterScan |
| 1 | EMailArchitect |
| 1 | DefenderMX |
| 1 | Code-Crafters |
| 1 | coremail |
| 1 | CCProxy |
| 1 | ecelerity |
| 1 | UNIX smap |
| 1 | Python SMTP |
| 1 | Ocean Mail |
| 27448 | TOTAL |