automated SMTP server survey 20000201
8480 servers queried in the last 90 days
4006 47.24 Sendmail
619 7.29 MS Exchange
564 6.65 unknown
427 5.03 qmail
206 2.42 IMail
200 2.35 Exim
188 2.21 Lotus
157 1.85 Netscape Mail server
154 1.81 Post.Office
146 1.72 Raptor Firewall
143 1.68 CheckPoint FireWall-1
129 1.52 ZMailer
118 1.39 NT Mail
87 1.02 Smail
86 1.01 Mercur
85 1.00 unknown (SMTP Rec.)
79 0.93 GroupWise
77 0.90 InterScan VirusWall
61 0.71 SMTP/cmap
58 0.68 Postfix
57 0.67 AltaVista Firewall
54 0.63 Eudora/AIMS/Mailshare
54 0.63 Intermail
53 0.62 MS SMTP Mail
49 0.57 Mercury
40 0.47 NPlex
35 0.41 MailSite SMTP Receiver
34 0.40 PMDF
32 0.37 MDaemon
29 0.34 Obtuse wrapper
27 0.31 Sun
26 0.30 EMWACS IMS
25 0.29 Stalker
24 0.28 David PostMan
23 0.27 PP
21 0.24 Mail-Max
20 0.23 SLMail
19 0.22 SMTP-GW
18 0.21 WebShield
15 0.17 MMDF
15 0.17 unknown (mailcity?)
13 0.15 InterLock
13 0.15 Mail.Hub TurboSendmail
13 0.15 MailShield
12 0.14 GMX (qmail?)
10 0.11 DSMTP
10 0.11 IBM AS/400 SMTP
9 0.10 FirstClass
9 0.10 Integralis SMTP Receiver
8 0.09 ccMail
8 0.09 IMA SMTP
8 0.09 Lyris
8 0.09 Rapidsite
8 0.09 Worldmail
7 0.08 FTGate
7 0.08 TFS
6 0.07 Quickmail
5 0.05 AppleShare
5 0.05 MX
4 0.04 Cyberguard or so
4 0.04 IBM VM SMTP
4 0.04 Interchange
4 0.04 MMTA
4 0.04 usmtpd
3 0.03 AltaVista Mail
3 0.03 Apple Internet Mail Server
3 0.03 iSMTP
3 0.03 Tid InfoMail
3 0.03 USA.NET
2 0.02 Connect2-SMTP
2 0.02 Kryptowall
2 0.02 ListSTAR
2 0.02 SiteClick
2 0.02 SMTP/smtp-proxy
2 0.02 Soft-Switch LMS
2 0.02 Viking
2 0.02 Worldgroup
1 0.01 Fwmail
1 0.01 Hawkeye SMTP
1 0.01 Hummingbird SMTPD
1 0.01 IPAD
1 0.01 LSMTP
1 0.01 MailBeamer
1 0.01 Postfix/VMailer
1 0.01 UCX
1 0.01 UnityMail
1 0.01 WorldSecure