| Count | MTA |
|---|---|
| 3522 | postfix |
| 3257 | MS Exchange |
| 2238 | Exim |
| 1242 | blocked |
| 659 | qmail |
| 390 | sendmail |
| 368 | unknown |
| 319 | mdaemon |
| 224 | Cisco |
| 142 | PowerMTA |
| 67 | barracuda |
| 63 | TrendMicro Reputation |
| 62 | rblsmtpd |
| 50 | MailEnable |
| 46 | Kerio |
| 26 | imail |
| 22 | Lotus Domino |
| 21 | Eudora |
| 20 | IceWarp |
| 18 | qpsmtpd |
| 16 | eSafe |
| 12 | SonicWALL |
| 10 | firstclass |
| 9 | Argosoft NT |
| 8 | SurgeSMTP |
| 6 | communigate |
| 4 | InterScan |
| 4 | Hurricane |
| 4 | Mercury |
| 4 | Sophos |
| 4 | XMail |
| 3 | MailSite |
| 2 | XWall/Exchange |
| 2 | SMTPBeamer |
| 2 | StrongMail |
| 2 | MailMax |
| 1 | Lyris |
| 1 | merak |
| 1 | F-Secure |
| 1 | DeskNow |
| 1 | Code-Crafters |
| 1 | stalker |
| 1 | vpop3 |
| 1 | RaidenMAILD |
| 1 | CheckPoint FW |
| 1 | Python SMTP |
| 1 | Spamfilter ISP |
| 1 | Sun JSMS |
| 1 | Symantec AVGate |
| 1 | Novonyx |
| 1 | Winmail |
| 1 | Novell Groupwise |
| 1 | dmail |
| 1 | Mailtraq |
| 1 | infusion |
| 1 | james |
| 12868 | TOTAL |