Open email survey

We're scanning ports 143 (imap), 993 (imaps), 110 (pop3) and 25 (smtp). We'll send a few commands to try to identify the software and publish the results here. No login attempts are made.

Current status

Number of IPs scanned:583106560 (13%)
Number of SMTP servers found:787943
Number of servers detected using banner text:456260 (57%)
Number of servers detected using command replies:604371 (76%)
Number of conflicting banner vs. reply detections:5444

Software used by SMTP servers:

SoftwareCount%
Exim16054120.37
Postfix14780218.76
(unknown)13786717.50
QMail775259.84
Exchange589567.48
PowerMTA480556.10
Sendmail409625.20
Unknown2276253.51
(unwanted)154261.96
MailEnable144571.83
IdeaSmtpServer112201.42
Unknown481411.03
MDaemon47200.60
Unknown642390.54
UnknownA37270.47
IMail36260.46
UnknownD34520.44
(disconnected)33650.43
(not SMTP)32770.42
UnknownC22750.29
Unknown918100.23
Unknown314860.19
Domino11800.15
IceWarp10100.13
SonicWALL7710.10
XMail6750.09
Lyris ListManager6090.08
WinWebMail5760.07
mailfront5670.07
Unknown13620.05
SmoothWall2460.03
Unknown82350.03
Courier2150.03
Unknown71840.02
RaidenMAILD1790.02
he.net1550.02
Unknown51530.02
UnknownE920.01
NTMail790.01
InterScan690.01
SLMail300.00
PostageApp20.00