automated SMTP server survey 19990701
8270 servers queried in the last 90 days
4132 49.96 Sendmail
579 7.00 MS Exchange
349 4.22 qmail
311 3.76 unknown
215 2.59 Lotus
196 2.37 Netscape Mail server
179 2.16 IMail
168 2.03 Exim
165 1.99 Post.Office
131 1.58 NT Mail
128 1.54 CheckPoint FireWall-1
122 1.47 Raptor Firewall
116 1.40 ZMailer
111 1.34 Mercur
106 1.28 Smail
77 0.93 GroupWise
73 0.88 Mercury
71 0.85 unknown (SMTP Rec.)
61 0.73 InterScan VirusWall
59 0.71 AltaVista Firewall
48 0.58 EMWACS IMS
47 0.56 MailSite SMTP Receiver
46 0.55 Eudora/AIMS/Mailshare
43 0.51 MS SMTP Mail
42 0.50 SMTP/cmap
37 0.44 PP
35 0.42 MDaemon
35 0.42 PMDF
30 0.36 Intermail
30 0.36 Obtuse wrapper
28 0.33 NPlex
25 0.30 Postfix
24 0.29 David PostMan
24 0.29 Rocketmail
23 0.27 InterLock
22 0.26 unknown (mailcity?)
21 0.25 Stalker
20 0.24 SLMail
19 0.22 Integralis SMTP Receiver
16 0.19 Sun
15 0.18 Mail-Max
15 0.18 Mail.Hub TurboSendmail
14 0.16 GMX (qmail?)
14 0.16 IMA SMTP
14 0.16 MMDF
12 0.14 FirstClass
12 0.14 MailShield
12 0.14 MX
12 0.14 SMTP-GW
11 0.13 WebShield
10 0.12 DSMTP
10 0.12 IBM AS/400 SMTP
10 0.12 Worldmail
9 0.10 AltaVista Mail
9 0.10 MMTA
8 0.09 Apple Internet Mail Server
8 0.09 Lyris
7 0.08 FTGate
6 0.07 ccMail
6 0.07 Cyberguard or so
6 0.07 Hawkeye SMTP
6 0.07 IBM VM SMTP
6 0.07 Worldgroup
5 0.06 Connect2-SMTP
5 0.06 Quickmail
5 0.06 TFS
5 0.06 UCX
4 0.04 AppleShare
4 0.04 Rapidsite
4 0.04 Soft-Switch LMS
4 0.04 WorldSecure
3 0.03 Kryptowall
3 0.03 LSMTP
3 0.03 MailBeamer
3 0.03 SMTP/smtp-proxy
3 0.03 Tid InfoMail
2 0.02 IPAD
2 0.02 Mail.Link
2 0.02 PowerWeb
2 0.02 SiteClick
2 0.02 USA.NET
2 0.02 usmtpd
1 0.01 Charon
1 0.01 Hummingbird SMTPD
1 0.01 Interchange
1 0.01 iSMTP
1 0.01 Mailmonster
1 0.01 mirabilis pager?
1 0.01 NASTA Gate SMTP Server
1 0.01 Postfix/VMailer
1 0.01 SMTP-OpenVMS
1 0.01 TGV/CISCO-MultiNet
1 0.01 Viking