automated SMTP server survey 19990801
9060 servers queried in the last 90 days
4471 49.34 Sendmail
665 7.33 MS Exchange
380 4.19 qmail
374 4.12 unknown
233 2.57 Lotus
204 2.25 IMail
200 2.20 Netscape Mail server
184 2.03 Post.Office
180 1.98 Exim
152 1.67 CheckPoint FireWall-1
143 1.57 Raptor Firewall
131 1.44 NT Mail
129 1.42 ZMailer
112 1.23 Mercur
108 1.19 Smail
98 1.08 GroupWise
82 0.90 unknown (SMTP Rec.)
76 0.83 InterScan VirusWall
75 0.82 Mercury
63 0.69 AltaVista Firewall
55 0.60 Eudora/AIMS/Mailshare
55 0.60 MailSite SMTP Receiver
54 0.59 SMTP/cmap
51 0.56 EMWACS IMS
42 0.46 MS SMTP Mail
39 0.43 MDaemon
38 0.41 PMDF
35 0.38 Obtuse wrapper
35 0.38 PP
30 0.33 Intermail
29 0.32 David PostMan
29 0.32 NPlex
28 0.30 Rocketmail
26 0.28 Postfix
25 0.27 Stalker
23 0.25 unknown (mailcity?)
22 0.24 SLMail
21 0.23 InterLock
21 0.23 Mail-Max
20 0.22 Integralis SMTP Receiver
19 0.20 Sun
17 0.18 SMTP-GW
15 0.16 MailShield
14 0.15 Mail.Hub TurboSendmail
14 0.15 MMDF
14 0.15 WebShield
12 0.13 MX
11 0.12 AltaVista Mail
11 0.12 FirstClass
11 0.12 IMA SMTP
11 0.12 Worldmail
10 0.11 Lyris
9 0.09 IBM AS/400 SMTP
8 0.08 Cyberguard or so
8 0.08 GMX (qmail?)
8 0.08 MMTA
7 0.07 Apple Internet Mail Server
7 0.07 ccMail
7 0.07 DSMTP
7 0.07 FTGate
7 0.07 IBM VM SMTP
7 0.07 Quickmail
7 0.07 TFS
6 0.06 Connect2-SMTP
5 0.05 Hawkeye SMTP
5 0.05 UCX
5 0.05 WorldSecure
4 0.04 AppleShare
4 0.04 LSMTP
4 0.04 Rapidsite
4 0.04 Soft-Switch LMS
3 0.03 IPAD
3 0.03 Kryptowall
3 0.03 Mail.Link
3 0.03 MailBeamer
3 0.03 SMTP/smtp-proxy
3 0.03 Tid InfoMail
3 0.03 USA.NET
3 0.03 Worldgroup
2 0.02 LetterRip
2 0.02 PowerWeb
2 0.02 SiteClick
2 0.02 usmtpd
1 0.01 Charon
1 0.01 Fwmail
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