| Count | MTA |
|---|---|
| 408424 | postfix |
| 255842 | unknown |
| 211226 | Exim |
| 188455 | qmail |
| 183400 | blocked |
| 177239 | MS Exchange |
| 141826 | sendmail |
| 32370 | MailEnable |
| 29370 | recvmail |
| 21059 | barracuda |
| 17066 | Cisco |
| 8436 | imail |
| 7619 | rblsmtpd |
| 5559 | eSafe |
| 4063 | PowerMTA |
| 3899 | mdaemon |
| 3090 | inscitek |
| 2495 | Lyris |
| 2377 | SonicWALL |
| 1497 | IceWarp |
| 1333 | XMail |
| 1300 | Kerio |
| 1238 | MailQ |
| 1128 | SurgeSMTP |
| 1091 | Sophos |
| 996 | MailSite |
| 914 | communigate |
| 909 | stalker |
| 718 | james |
| 701 | Lotus Domino |
| 678 | qpsmtpd |
| 618 | Argosoft NT |
| 585 | Hurricane |
| 501 | ecelerity |
| 497 | Python SMTP |
| 482 | hmailserver |
| 460 | XWall/Exchange |
| 420 | Winmail |
| 401 | merak |
| 386 | modusMail |
| 332 | WinWebMail |
| 328 | CCProxy |
| 289 | Mercury |
| 277 | firstclass |
| 256 | TrendMicro Reputation |
| 231 | Eudora |
| 217 | gordano |
| 204 | Code-Crafters |
| 137 | spamsniper |
| 134 | StrongMail |
| 133 | Novell Groupwise |
| 132 | mailmarshal |
| 113 | RoadRunner |
| 108 | MailMax |
| 106 | dmail |
| 105 | coremail |
| 62 | DeskNow |
| 59 | VMS_PMDF |
| 57 | postoffice |
| 53 | Mailtraq |
| 52 | VHCS |
| 50 | assp |
| 50 | RaidenMAILD |
| 48 | Symantec AVGate |
| 46 | EMailArchitect |
| 41 | Spamfilter ISP |
| 39 | netscape |
| 39 | mirapoint |
| 39 | Scalix |
| 32 | Hexamail |
| 29 | lsmtp |
| 27 | webcrossing |
| 26 | $1 |
| 23 | vpop3 |
| 23 | InterScan |
| 23 | worldgroup |
| 23 | UNIX RS |
| 22 | EarthLink |
| 21 | VopMail |
| 19 | Sun JSMS |
| 18 | CheckPoint FW |
| 18 | intermail |
| 17 | smoothwall |
| 14 | DefenderMX |
| 14 | CMailServer |
| 14 | Net::SMTP::Server |
| 14 | Wildcat |
| 13 | Softalk |
| 13 | spamd |
| 11 | logsat |
| 11 | UCEPROTECT |
| 8 | UNIX smap |
| 7 | ntmail |
| 7 | CMS IBM VM SMTP |
| 6 | Ocean Mail |
| 6 | slmail |
| 6 | worldmail |
| 6 | AS/400 IBM SMTP |
| 6 | webstar |
| 5 | ModusMail |
| 5 | Windows NAI WebShield |
| 4 | Cellopoint |
| 4 | Novonyx |
| 4 | David |
| 4 | mailmax |
| 3 | UNIX Zmailer |
| 3 | Maillennium |
| 3 | MuseMail |
| 3 | SmartFilter |
| 3 | WinRoute |
| 2 | MIMESWeeper |
| 2 | internetanywhere |
| 2 | interchange |
| 2 | imoxion |
| 2 | iPlanet |
| 2 | sina_smtpd |
| 2 | expurgate |
| 2 | X Major BBS |
| 2 | Windows Floosietek FTGate |
| 2 | UNIX/Windows Lotus SMTP MTA |
| 2 | tumbleweed |
| 2 | vmsmx |
| 2 | letterrip |
| 1 | obtuse |
| 1 | litemail |
| 1 | MailNow |
| 1 | MacOS QuickMail |
| 1 | UNIX InterMail |
| 1 | teles |
| 1 | ExpressMail |
| 1 | hamster |
| 1 | mercur |
| 1 | SMTPBeamer |
| 1 | PrivaWall |
| 1724960 | TOTAL |