automated SMTP server survey 20000101
10820 servers queried in the last 90 days
5211 48.16 Sendmail
794 7.33 MS Exchange
611 5.64 unknown
558 5.15 qmail
276 2.55 IMail
256 2.36 Exim
222 2.05 Lotus
198 1.82 Netscape Mail server
187 1.72 Post.Office
185 1.70 CheckPoint FireWall-1
170 1.57 Raptor Firewall
155 1.43 ZMailer
153 1.41 NT Mail
134 1.23 Mercur
111 1.02 Smail
104 0.96 GroupWise
95 0.87 unknown (SMTP Rec.)
88 0.81 InterScan VirusWall
80 0.73 SMTP/cmap
73 0.67 Eudora/AIMS/Mailshare
72 0.66 MS SMTP Mail
69 0.63 Postfix
68 0.62 AltaVista Firewall
68 0.62 Mercury
62 0.57 Intermail
52 0.48 MailSite SMTP Receiver
51 0.47 NPlex
47 0.43 PMDF
41 0.37 EMWACS IMS
40 0.36 MDaemon
38 0.35 Obtuse wrapper
34 0.31 Sun
29 0.26 David PostMan
29 0.26 PP
28 0.25 Stalker
24 0.22 Mail-Max
23 0.21 unknown (mailcity?)
21 0.19 WebShield
20 0.18 SLMail
20 0.18 SMTP-GW
19 0.17 MailShield
18 0.16 Integralis SMTP Receiver
18 0.16 InterLock
17 0.15 DSMTP
16 0.14 FirstClass
14 0.12 Mail.Hub TurboSendmail
14 0.12 Worldmail
13 0.12 IBM AS/400 SMTP
13 0.12 MMDF
11 0.10 AltaVista Mail
10 0.09 AppleShare
10 0.09 ccMail
10 0.09 GMX (qmail?)
10 0.09 TFS
9 0.08 IMA SMTP
8 0.07 MX
8 0.07 Rapidsite
7 0.06 FTGate
7 0.06 Lyris
6 0.05 Connect2-SMTP
6 0.05 Interchange
6 0.05 Quickmail
5 0.04 Apple Internet Mail Server
5 0.04 Cyberguard or so
5 0.04 IBM VM SMTP
4 0.03 MMTA
4 0.03 USA.NET
4 0.03 usmtpd
3 0.02 iSMTP
3 0.02 LSMTP
3 0.02 MailBeamer
3 0.02 SMTP/smtp-proxy
3 0.02 Tid InfoMail
3 0.02 UCX
3 0.02 Worldgroup
2 0.01 Fwmail
2 0.01 Hawkeye SMTP
2 0.01 Kryptowall
2 0.01 Mail.Link
2 0.01 Postfix/VMailer
2 0.01 SiteClick
2 0.01 Soft-Switch LMS
2 0.01 Viking
1 0.00 Hummingbird SMTPD
1 0.00 IPAD
1 0.00 ListSTAR
1 0.00 mirabilis pager?
1 0.00 NASTA Gate SMTP Server
1 0.00 PowerWeb
1 0.00 TGV/CISCO-MultiNet
1 0.00 UnityMail
1 0.00 WorldSecure