automated SMTP server survey 20000216
6261 servers queried in the last 90 days
2977 47.54 Sendmail
470 7.50 unknown
418 6.67 MS Exchange
349 5.57 qmail
151 2.41 Exim
137 2.18 Lotus
127 2.02 IMail
121 1.93 Netscape Mail server
114 1.82 Post.Office
112 1.78 CheckPoint FireWall-1
90 1.43 Raptor Firewall
90 1.43 ZMailer
81 1.29 NT Mail
58 0.92 InterScan VirusWall
58 0.92 Smail
56 0.89 unknown (SMTP Rec.)
54 0.86 Intermail
49 0.78 Postfix
46 0.73 SMTP/cmap
45 0.71 Mercur
43 0.68 GroupWise
39 0.62 MS SMTP Mail
39 0.62 NPlex
38 0.60 AltaVista Firewall
34 0.54 Mercury
32 0.51 Eudora/AIMS/Mailshare
28 0.44 PMDF
26 0.41 MailSite SMTP Receiver
21 0.33 Sun
20 0.31 PP
19 0.30 Stalker
18 0.28 MDaemon
17 0.27 Obtuse wrapper
17 0.27 SLMail
16 0.25 EMWACS IMS
14 0.22 Mail-Max
14 0.22 MMDF
13 0.20 GMX (qmail?)
13 0.20 Mail.Hub TurboSendmail
13 0.20 MailShield
13 0.20 SMTP-GW
12 0.19 David PostMan
12 0.19 WebShield
10 0.15 InterLock
10 0.15 unknown (mailcity?)
8 0.12 DSMTP
8 0.12 Lyris
8 0.12 Rapidsite
7 0.11 FirstClass
7 0.11 FTGate
7 0.11 IMA SMTP
7 0.11 Worldmail
6 0.09 Integralis SMTP Receiver
6 0.09 TFS
4 0.06 AppleShare
4 0.06 ccMail
4 0.06 Quickmail
4 0.06 usmtpd
3 0.04 AltaVista Mail
3 0.04 Cyberguard or so
3 0.04 IBM AS/400 SMTP
3 0.04 IBM VM SMTP
3 0.04 USA.NET
2 0.03 Hawkeye SMTP
2 0.03 Interchange
2 0.03 Kryptowall
2 0.03 ListSTAR
2 0.03 MMTA
2 0.03 MX
2 0.03 SMTP/smtp-proxy
2 0.03 Tid InfoMail
2 0.03 Worldgroup
1 0.01 Apple Internet Mail Server
1 0.01 Connect2-SMTP
1 0.01 Hummingbird SMTPD
1 0.01 IPAD
1 0.01 iSMTP
1 0.01 LSMTP
1 0.01 MailBeamer
1 0.01 Postfix/VMailer
1 0.01 SiteClick
1 0.01 Soft-Switch LMS
1 0.01 UCX
1 0.01 UnityMail
1 0.01 Viking
1 0.01 WorldSecure