Overview of services running on Port 587 TCP.
~4.42 Million IP addresses observed from May to December 2012
To get raw lists of the data go to Download. For an explanation of what this data is and how it was obtained, see Paper.

Servicename Product Version Count Percent
smtp122723827.785
smtpExim smtpd4.77113984725.806
smtpPostfix smtpd44311710.032
smtpExim smtpd3009886.814
smtpExim smtpd4.802519225.704
smtpSymantec Enterprise Security manager smtpd1918064.343
smtpIdeaSmtpServer smtpdv0.801426223.229
smtpMicrosoft Exchange smtpd750411.699
smtpSendmail602421.364
no match-/--/-559991.268
smtpSendmail8.12.9/8.11.3487841.104
smtpExim smtpd4.69462881.048
smtpSendmail8.13.8/8.13.8279220.632
smtpSendmail8.14.3/8.14.3249060.564
smtpSendmail8.14.4/8.14.4222910.505
smtpAlt-N MDaemon mail server12.5.6222840.505
smtpSendmail8.13.1/8.13.1121930.276
smtpExim smtpd4.72113620.257
smtpSendmail8.14.5/8.14.5108140.245
smtprblsmtpd wrapped smtpd96120.218
smtpSendmail8.14.3/8.12.1092910.21
smtpMicrosoft ESMTP6.0.3790.467587340.198
smtpMDaemon smtpd11.0.379310.18
smtpExim smtpd4.7677950.176
smtpmailfront smtpd65500.148
smtpSendmail8.12.11.20060614/8.12.1061170.138
smtpExim smtpd4.7457830.131
nagios-nscaNagios NSCA48910.111
smtpSendmail8.13.7/8.13.748830.111
smtpSendmail8.14.2/8.14.248500.11
smtpBarracuda Networks Spam Firewall smtpd47750.108
smtpSendmail8.13.8+Sun/8.13.845040.102
smtpMailEnable smptd1.986--42730.097
smtpSendmail8.13.6.20060614/8.13.638730.088
smtpSendmail8.14.1/8.13.835640.081
smtpExim smtpd4.7135570.081
smtpMDaemon smtpd12.5.634380.078
smtpSendmail8.12.11.20060308/8.12.1131210.071
smtpMailEnable smptd5.10--30460.069
smtpExim smtpd4.6330020.068
smtpExim smtpd4.6729150.066
smtpSendmail8.14.1/8.14.127600.062
smtpSendmail8.14.4/8.14.327500.062
smtpSendmail8.14.4/8.14.227270.062
smtpCitadel smtpd26380.06
smtpSendmail8.13.6/8.13.626340.06
smtpMDaemon smtpd11.0.026110.059
smtpMailEnable smptd4.26--25040.057
chatAIM or ICQ server24920.056
smtpSendmail8.14.5/8.14.424470.055
smtpSendmail8.11.6/8.11.622540.051
smtpSendmail8.12.10/8.12.1020660.047
smtpNetBox smtpd20410.046
smtpSendmail8.12.11/8.12.1119230.044
smtpKerio Connect smtpd7.4.118430.042
smtpSendmail8.13.4/8.13.417380.039
smtpExim smtpd4.7316710.038
smtpMDaemon smtpd10.0.016120.036
smtpSendmail8.14.2/8.14.3/[SAKURA-WEB]/2008070815800.036
smtpMailEnable smptd6.03--14110.032
smtpMailEnable smptd6.5--13950.032
smtpMailEnable smptd6.0--13320.03
smtpKerio Connect smtpd7.1.0 patch 113150.03
smtpMDaemon smtpd12.5.412790.029
smtpMicrosoft ESMTP6.0.3790.395912780.029
smtpSendmail8.13.3/8.13.312190.028
smtpSendmail8.13.8/8.13.111640.026
smtpKerio Connect smtpd7.4.211430.026
smtpSendmail8.13.8/8.12.1111040.025
smtpIMail NT-ESMTP11.5 1-110910.025
smtpSendmail8.14.3/8.14.210790.024
smtpSendmail8.14.5/8.13.610590.024
smtpKerio Connect smtpd7.4.010570.024
smtpKerio Connect smtpd7.3.210530.024
smtpSendmail8.13.1/8.13.310460.024
smtpMailEnable smptd5.51--10210.023
smtpMailEnable smptd4.14--10130.023
smtpMDaemon smtpd10.1.19960.023
smtpMailEnable smptd1.983--9540.022
smtpMDaemon smtpd9.6.19330.021
smtpEudora EIMS X smtpd3.3.99150.021
smtpSendmail8.13.6.20060614/8.13.18970.02
http8610.019
smtpMailEnable smptd6.53--8580.019
smtpSendmail8.11.6/8.11.08560.019
smtpMDaemon smtpd10.1.28400.019
smtpSendmail8.13.6/8.13.18130.018
smtpIceWarp smtpd9.3.17980.018
smtpExim smtpd4.80.17910.018
smtpKerio Connect smtpd7.4.37880.018
smtpSendmail8.12.11.200606147710.017
smtpMailEnable smptd3.62--7450.017
smtpSendmail8.11.7p1+Sun/8.11.77360.017
smtphMailServer7110.016
smtpMDaemon smtpd10.1.06990.016
smtpSendmail8.14.0/8.14.06860.016
smtpMailEnable smptd5.11--6790.015
smtpSendmail8.13.7+Sun/8.13.76750.015
smtpSendmail8.12.10+Sun/8.12.106740.015
smtphMailServer smtpd6710.015
smtpSendmail8.13.6/8.12.106700.015
smtpKerio Connect smtpd7.3.1 patch 26620.015
smtpMailEnable smptd6.01--6450.015
smtpMDaemon smtpd9.6.66310.014
smtpIceWarp smtpd9.1.06280.014
smtpSendmail8.14.3/8.14.3/Debian-9.46200.014
smtpSendmail8.12.9/8.12.96180.014
smtpSendmail8.12.8/8.12.86180.014
smtpSendmail8.14.5/8.13.16050.014
smtpExim smtpd4.705960.013
smtpMDaemon smtpd12.5.35940.013
smtpSendmail8.14.3/8.14.3/Debian-5+lenny15690.013
smtpSendmail8.14.5/8.13.45680.013
smtpMerak Mail Server smtpd8.0.35620.013
smtpSurgemail smtpd5.3h2-25560.013
smtpMDaemon smtpd9.5.25540.013
smtpMailEnable smptd6.02--5460.012
smtpMailEnable smptd0-6.03-5320.012
smtpSendmail8.14.2/8.14.2/Kp5200.012
smtpMDaemon smtpd13.0.35130.012
smtpMDaemon smtpd12.0.35130.012
smtpMailEnable smptd0-1.87-5080.012
smtpMailEnable smptd0-3.63-5030.011
smtpSendmail8.14.4/8.13.84860.011
smtpMicrosoft Exchange 2010 smtpd4760.011
smtpSurgemail smtpd5.2a-14710.011
smtpMailEnable smptd6.52--4690.011
smtpMailEnable smptd1.981--4610.01
smtpSendmail8.12.6/8.12.64590.01
httplighttpd1.4.294590.01
smtpIceWarp smtpd9.4.24570.01
smtpSendmail8.11.6/8.11.34520.01
smtpMDaemon smtpd9.5.14490.01
smtpMDaemon smtpd12.0.44460.01
smtpCisco PIX sanitized smtpd4400.01
smtpXMail SMTP server1.274330.01
smtpMailEnable smptd0-2.53-4290.01
smtpSendmail8.13.8/8.13.64220.01
smtpIMail NT-ESMTP11.03 1-14190.009
smtpSendmail8.11.6/8.10.14170.009
httplighttpd1.4.194120.009
smtpMailEnable smptd6.56--4050.009
smtpMDaemon smtpd9.6.24030.009
smtpKerio MailServer smtpd3990.009
smtpMailEnable smptd4.23--3960.009
smtpSendmail8.13.4/8.12.113900.009
smtpAxigen smtpd3860.009
smtpMailEnable smptd6.57--3840.009
smtpMailEnable smptd5.53--3790.009
smtpSendmail8.12.8p1/8.12.83770.009
smtpKerio Connect smtpd7.1.33750.008
smtpIceWarp smtpd10.3.53740.008
smtpKerio Connect smtpd7.1.13700.008
smtpCommunigate Pro SMTP5.4.43690.008
smtpIMail NT-ESMTP11.01 1-13660.008
smtpSendmail8.13.6/8.13.6/PURDUE_CS-2.03650.008
smtpSendmail8.12.9p2/8.12.93650.008
smtpMDaemon smtpd12.5.23630.008
smtpExim smtpd4.623630.008
smtpSendmail8.14.5/8.14.33620.008
smtpXMail SMTP server1.253610.008
smtpSendmail8.10.2/8.10.23540.008
smtpSendmail8.14.4/8.13.63520.008
smtpSymantec Messaging Gateway smtpd3510.008
smtpSendmail8.12.10/8.11.33500.008
smtpSurgemail smtpd6.1c-13420.008
smtpSendmail8.14.4/8.14.53420.008
smtpSendmail8.12.11.20060614/8.12.113340.008
smtpKerio Connect smtpd7.3.03300.007
smtpKerio Connect smtpd7.0.13250.007
smtpSendmail8.14.4+Sun/8.14.43210.007
smtpSendmail8.13.6.20060614/8.12.63210.007
smtpSendmail8.11.6/8.11.73160.007
smtpMailEnable smptd0-4.26-3150.007
smtpExim smtpd4.683130.007
smtpMicrosoft ESMTP6.0.3790.18303120.007
smtpMDaemon smtpd9.0.43070.007
smtpSendmail8.11.7p3+Sun/8.11.73050.007
smtpMDaemon smtpd10.0.53050.007
smtpMailEnable smptd6.03--6.033050.007
smtpIceWarp smtpd10.4.33040.007
smtpCommunigate Pro SMTP5.1.123000.007
smtpMDaemon smtpd10.0.22990.007
smtp-proxyESET NOD32 anti-virus smtp proxy2920.007
smtpIMail NT-ESMTP12.2.0.169 1-12890.007
smtpIMail NT-ESMTP11.5 2-12880.007
smtpMailEnable smptd6.56--6.562850.006
smtpXMail SMTP server1.262840.006
smtpMailEnable smptd0-6.54-2820.006
smtpMailEnable smptd6.60--2810.006
smtpMailEnable smptd0-5.11-2780.006
smtpSendmail8.13.6/8.11.62770.006
httpMicrosoft IIS httpd2770.006
smtpMDaemon smtpd12.0.12740.006
smtpMDaemon smtpd11.0.22720.006
smtpIMail NT-ESMTP11.02 1-12710.006
smtpMailEnable smptd4.22--2700.006
smtpKerio Connect smtpd8.0.02680.006
smtpMDaemon smtpd9.6.42660.006
smtpWebwasher CSM Suite smtpd2620.006
smtpMDaemon smtpd9.6.52620.006
smtpSurgemail smtpd3.5b3-32610.006
smtpExim smtpd4.522600.006
smtpCode-Crafters Ability Mail Server smtpd2.712600.006
smtpSendmail8.11.0/8.11.12580.006
smtpMDaemon smtpd8.1.42580.006
smtpMDaemon smtpd13.0.22560.006
smtpMailEnable smptd--3.612560.006
smtpSendmail8.12.9p2/8.12.62550.006
smtpSurgemail smtpd3.7b6-62530.006
smtpMDaemon smtpd9.5.52520.006
smtpMDaemon smtpd8.1.32510.006
smtpMDaemon smtpd9.5.62480.006
smtpSendmail8.12.11.20060308/8.12.11/SuSE2460.006
smtpMailEnable smptd6.54--6.542450.006
smtpSendmail8.14.3/8.13.82420.005
smtpMailEnable Enterprise smptd3.532420.005
smtpIMail NT-ESMTP12.1.0.270 1-12370.005
smtpMDaemon smtpd12.5.52360.005
smtpSendmail8.11.6+Sun/8.11.62350.005
smtpSendmail8.13.8/8.13.8/clisys_sendmail_client2310.005
smtpMicrosoft ESMTP7.5.7601.175142300.005
smtpMicrosoft ESMTP5.0.2195.73812300.005
smtpMDaemon smtpd9.0.12300.005
smtpMailEnable smptd0-3.62-2280.005
smtpKerio Connect smtpd7.2.22260.005
smtpSendmail8.13.4/8.13.4/Debian-3sarge32240.005
smtpSendmail8.13.6+Sun/8.13.62230.005
smtpMDaemon smtpd12.0.02220.005
smtpSendmail8.12.5/8.12.52210.005
smtpSurgemail smtpd3.9e-12200.005
smtpMailEnable smptd0-5.51-2200.005
smtpExim smtpd4.602190.005
smtpSendmail8.13.8/8.12.82170.005
smtpMDaemon smtpd12.5.12170.005
smtpMAILsweeper SMTP proxy2160.005
smtpSendmail8.13.5.20060308/8.13.5/Debian-3ubuntu12150.005
smtpKerio Connect smtpd7.3.32140.005
smtpMDaemon smtpd10.0.42100.005
smtpExim smtpd4.752090.005
smtpMailEnable smptd5.5--2050.005
smtpKerio Connect smtpd7.2.42040.005
smtpSendmail8.14.2/8.13.82010.005
smtpSendmail8.13.6.20060614/8.12.111990.005
smtpKerio Connect smtpd7.3.11990.005
smtpXMail SMTP server1.241980.004
smtpSendmail8.14.2/8.13.61970.004
smtpSendmail8.13.4/8.13.4/Debian-31970.004
smtpSurgemail smtpd6.0a5-51950.004
smtpIceWarp smtpd10.0.71950.004
smtpPostfix smtpd2.5.61920.004
smtpMailEnable smptd4.26--4.261900.004
smtpqpsmtpd0.401890.004
smtpIA Mailserver smtpd1860.004
smtpMailEnable smptd0-3.6-1840.004
smtpCommunigate Pro SMTP5.0.141830.004
httpMicrosoft HTTPAPI httpd2.01830.004
smtpSendmail8.13.8/8.13.8/Debian-31800.004
smtpSendmail8.14.2/8.12.111780.004
smtpIceWarp smtpd10.4.11770.004
smtpMailEnable smptd5.52--1760.004
smtpKerio Connect smtpd7.0.21750.004
smtpIMail NT-ESMTP12.0.0.384 1-11750.004
smtpSendmail8.13.6/8.12.111730.004
smtpSurgemail smtpd6.0a4-41710.004
smtpMerak Mail Server smtpd8.3.15-11710.004
smtpKerio Connect smtpd7.1.41710.004
smtpIceWarp smtpd9.4.01710.004
smtpMDaemon smtpd9.6.31700.004
smtpSendmail8.14.1/8.14.1/ull-ucs-client_1.71680.004
smtpEudora EIMS X smtpd3.3.71660.004
smtpMailEnable smptd1.96--1640.004
httpthttpd2.241630.004
smtpSendmail8.11.11620.004
smtpSurgemail smtpd5.3h-11600.004
smtpMailEnable smptd0-2.52-1600.004
smtpMailEnable smptd0-2.38-1600.004
smtpSendmail8.12.11.20060308/3.7W1580.004
smtpKerio Connect smtpd7.1.21580.004
smtpArGoSoft Mail Server Pro1.8.9.61580.004
smtpIceWarp smtpd9.2.11570.004
smtpSendmail8.13.5/8.13.51550.004
smtpSendmail8.14.3/8.12.91540.003
smtpMailEnable smptd6.55--1530.003
httpGoAhead-Webs httpd1530.003
smtpDeskNow smtpd1500.003
smtpSurgemail smtpd3.8k4-41480.003
smtpSendmail8.14.4/8.13.11470.003
smtpSendmail8.11.1/8.11.11470.003
smtpMDaemon smtpd12.5.01470.003
smtpMailEnable smptd0-4.23-1470.003
smtpSendmail8.12.111460.003
smtpSendmail8.14.3/8.14.41450.003
smtpSendmail8.12.11/8.12.101450.003
smtpIceWarp smtpd10.1.21430.003
smtpSendmail8.13.3+Sun/8.13.31420.003
smtpKerio Connect smtpd7.2.3 patch 11420.003
smtpKerio Connect smtpd7.0.01420.003
smtpSendmail8.12.10/8.12.81390.003
smtpUnrecognized SMTP service1380.003
smtpMailEnable smptd4.25--1380.003
smtpMailEnable smptd--3.631380.003
sshDropbear sshd0.521370.003
smtpMailEnable smptd5.51--5.511370.003
smtpSendmail8.14.2/8.14.2/[SAKURA-WEB]/200807081350.003
smtpMailEnable smptd0-6.56-1350.003
smtpMailEnable smptd--3.621340.003
smtpMailEnable smptd0-6.51-1340.003
smtpIceWarp smtpd10.3.11340.003
smtpXMail SMTP server1.221330.003
smtpMDaemon smtpd10.0.11330.003
smtpSendmail8.12.9p2/8.12.31300.003
smtpMailEnable smptd0-5.10-1290.003
smtpIMail NT-ESMTP11.03 2-11290.003
smtpSendmail8.13.3 rev 1.0031260.003
smtpSendmail8.13.1/8.12.91260.003
smtpSendmail1.0/1.01260.003
smtpSendmail8.11.0/8.11.01250.003
smtpMailEnable smptd6.51--1240.003
smtpMailEnable smptd0-6.0-1240.003
smtpKerio Connect smtpd7.2.31240.003
smtpAlt-N MDaemon mail server8.0.21230.003
smtpSendmail8.12.10/8.12.10/DCN1220.003
smtpMDaemon smtpd13.0.01220.003
smtpSendmail8.14.5/8.12.81210.003
smtpSendmail8.13.4+Sun/8.13.31200.003
smtpSendmail8.14.1/8.13.31190.003
smtpSendmail8.12.3/8.12.3/Debian-7.21190.003
smtpMDaemon smtpd11.0.11190.003
smtpArGoSoft Mail Server Pro1.81190.003
smtpSendmail8.13.6.20060614/8.13.6/PURDUE_CS-2.01180.003
smtpSendmail8.14.3/8.14.11170.003
smtpMailEnable smptd5.07--1170.003
smtpIdeaSmtpServer smtpdv0.701170.003
smtpMailEnable smptd6.59--1160.003
smtpCommunigate Pro SMTP5.3.51160.003
smtpSendmail8.14.3/8.14.3/Debian-9.1ubuntu11150.003
smtpKerio Connect smtpd7.2.01140.003
smtpSendmail8.12.10/8.12.11/SuSE1130.003
smtpMailEnable smptd6.53--6.531130.003
smtpMailEnable smptd0-3.04-1130.003
smtpSendmail8.13.1/8.13.41120.003
smtpqpsmtpd0.821120.003
smtpMailEnable smptd6.0--6.01120.003
smtpMailEnable smptd0-3.61-1090.002
smtpSendmail8.14.2/8.14.41080.002
smtpMailEnable smptd4.17--1080.002
smtpMailEnable smptd0-6.02-1080.002
smtpKerio Connect smtpd7.0.2 patch 11080.002
smtpIMail NT-ESMTP11.01 2-11070.002
smtpMailEnable smptd6.63--6.631060.002
smtpSendmail8.12.3/8.12.3/Debian-6.61050.002
smtpIMail NT-ESMTP11.5 3-11050.002
smtpSun Java System Messaging Server smtpd641040.002
smtpSendmail8.12.3/8.12.31040.002
smtpCommunigate Pro SMTP5.4.51040.002
ssh1030.002
smtpSendmail8.14.1/8.13.61010.002
smtpMDaemon smtpd9.0.01010.002
smtpMailEnable smptd0-6.01-1010.002
smtpMailEnable smptd4.16--1000.002
smtpSendmail8.12.11.20060614/8.12.9990.002
smtpSendmail8.12.10+Sun/8.12.9990.002
smtpMicrosoft ESMTP5.0.2195.6713990.002
smtpKerio Connect smtpd7.0.0 patch 1990.002
smtpSendmail8.13.4/8.13.4/Debian-3sarge1980.002
smtpSendmail8.13.4/8.13.3980.002
vncVNC970.002
smtpSendmail8.14.4/8.13.5970.002
smtpMailEnable smptd6.70--970.002
smtpMailEnable smptd0-3.53-970.002
smtpIMail NT-ESMTP12.0.0.348 1-1960.002
smtpMDaemon smtpd12.0.2950.002
smtpMailEnable smptd0-6.52-950.002
httpCCProxy950.002
smtpSendmail8.14.4/8.12.9940.002
smtpSendmail8.11.6/8.11.2920.002
smtpMailEnable smptd6.72--920.002
smtpSendmail8.14.3/8.13.4910.002
smtpSendmail8.13.3 rev 1.004910.002
smtpMailEnable smptd6.5--6.5910.002
smtpMailEnable smptd5.03--910.002
smtpKerio Connect smtpd7.1.4 patch 1910.002
smtpKerio Connect smtpd7.1.0910.002
smtpSendmail8.14.5/8.14.2900.002
smtpSendmail8.12.11.20060308/8.12.10900.002
smtpMicrosoft ESMTP7.0.6002.18222900.002
smtpMailEnable smptd1.9--900.002
smtpMailEnable smptd0-5.53-900.002
smtpMailEnable smptd6.65--880.002
smtpIceWarp smtpd10.3.4880.002
smtpSendmail8.11.6p2/8.11.6870.002
smtpSendmail8.14.3/8.13.6850.002
smtpSendmail8.14.2/8.14.1850.002
smtpSendmail8.13.8/8.13.4850.002
smtpMailEnable smptd4.0--850.002
smtpMDaemon smtpd13.0.1840.002
smtpSurgemail smtpd5.3b2-2830.002
smtpMDaemon smtpd8.0.3830.002
smtpMailEnable smptd0-4.22-830.002
smtpArGoSoft Mail Server Pro1.8.9.5830.002
smtpSendmail8.12.2/8.12.2810.002
smtpMicrosoft ESMTP7.0.6002.18264810.002
smtpMailEnable smptd4.22--4.22810.002
smtpMailEnable smptd1.95--810.002
smtpALT-N SecurityGateway smtpd2.0.7810.002
smtpSendmail8.12.9+Sun/8.12.9800.002
smtpSendmail8.11.7p3+Sun/8.11.6800.002
smtpCode-Crafters Ability Mail Server smtpd2.72800.002
smtpKerio Connect smtpd7.2.0 patch 1790.002
smtpSendmail8.11.5/8.11.5780.002
smtpCommunigate Pro SMTP4.1.8780.002
smtpSendmail8.14.3/8.13.5770.002
smtpSendmail8.13.7/8.13.4770.002
smtpSendmail8.13.6/8.12.9770.002
smtpMDaemon smtpd8.1.1770.002
smtpMailEnable smptd5.0--770.002
pop3MailEnable POP3 Server770.002
smtpSendmail8.13.1/8.12.11760.002
smtpSendmail8.11.3/8.11.3760.002
smtpNovell NetWare GroupWise Internet Agent smtpd750.002
smtpIMail NT-ESMTP11.0 1-1750.002
smtpSendmail8.14.4/8.14.0740.002
smtpMDaemon smtpd9.5.4740.002
smtpMailEnable smptd4.23--4.23740.002
smtpMailEnable smptd0-6.5-740.002
smtpAnNyung smtpd8.14.3-1740.002
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smtpSendmail8.12.11/8.12.8150.0
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smtpMailEnable smptd5.06--150.0
smtpMailEnable smptd5.03--5.03150.0
smtpMailEnable smptd-4.26-150.0
smtpMailEnable smptd-4.16-150.0
smtpMailEnable smptd0-3.63-2.53150.0
smtpMailEnable smptd0--150.0
smtpKerio MailServer6.7.0 patch 1150.0
smtpIMail NT-ESMTP11.5 7-1150.0
smtpIceWarp smtpd10.4.4150.0
smtpExim smtpd4.80.1-51968150.0
smtpCommunigate Pro SMTP5.3.7150.0
smtpArGoSoft Mail Server Pro1.8.9.4150.0
smtpArGoSoft Mail Server Freeware1.8.9.2150.0
pop3Microsoft Exchange 2003 pop3d6.5.7638.1150.0
pop3hMailServer pop3d150.0
imapMicrosoft Exchange Server 2003 imapd6.5.7638.1150.0
ftpPure-FTPd150.0