automated SMTP server survey 20000301
6549 servers queried in the last 90 days
3089 47.16 Sendmail
513 7.83 unknown
442 6.74 MS Exchange
370 5.64 qmail
163 2.48 Exim
141 2.15 Lotus
129 1.96 IMail
126 1.92 Netscape Mail server
120 1.83 CheckPoint FireWall-1
113 1.72 Post.Office
95 1.45 Raptor Firewall
88 1.34 ZMailer
79 1.20 NT Mail
61 0.93 Intermail
61 0.93 InterScan VirusWall
59 0.90 Smail
57 0.87 Postfix
54 0.82 SMTP/cmap
51 0.77 unknown (SMTP Rec.)
48 0.73 GroupWise
47 0.71 MS SMTP Mail
44 0.67 Mercur
39 0.59 AltaVista Firewall
38 0.58 NPlex
33 0.50 Eudora/AIMS/Mailshare
33 0.50 Mercury
29 0.44 MailSite SMTP Receiver
27 0.41 PMDF
24 0.36 Sun
23 0.35 Obtuse wrapper
22 0.33 MDaemon
22 0.33 SLMail
20 0.30 Stalker
19 0.29 PP
18 0.27 EMWACS IMS
16 0.24 Mail-Max
14 0.21 MMDF
13 0.19 GMX (qmail?)
13 0.19 Mail.Hub TurboSendmail
13 0.19 MailShield
12 0.18 SMTP-GW
12 0.18 WebShield
11 0.16 InterLock
11 0.16 unknown (mailcity?)
10 0.15 David PostMan
10 0.15 IMA SMTP
9 0.13 Rapidsite
8 0.12 DSMTP
8 0.12 FirstClass
7 0.10 Worldmail
6 0.09 Integralis SMTP Receiver
6 0.09 Lyris
5 0.07 AppleShare
5 0.07 FTGate
4 0.06 ccMail
4 0.06 IBM AS/400 SMTP
4 0.06 MX
4 0.06 TFS
4 0.06 usmtpd
3 0.04 Cyberguard or so
3 0.04 Hawkeye SMTP
3 0.04 IBM VM SMTP
3 0.04 Interchange
3 0.04 Quickmail
3 0.04 USA.NET
2 0.03 AltaVista Mail
2 0.03 Apple Internet Mail Server
2 0.03 Kryptowall
2 0.03 ListSTAR
2 0.03 Tid InfoMail
2 0.03 Worldgroup
1 0.01 Hummingbird SMTPD
1 0.01 IPAD
1 0.01 iSMTP
1 0.01 LSMTP
1 0.01 Mail.Link
1 0.01 MailBeamer
1 0.01 Postfix/VMailer
1 0.01 SiteClick
1 0.01 SMTP/smtp-proxy
1 0.01 Soft-Switch LMS
1 0.01 UCX
1 0.01 UnityMail
1 0.01 WorldSecure