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Mail (MX) Server Survey
April 1st, 2015

Report Description
This report is a comprehensive report involving all mail servers we know of visible on the internet. For each domain in our conventional web server survey, we also determine the list of mail servers that provide inbound mail services (via MX record lookups). Each unique mail server is connected to once each month, where we wait for the server's "220 " message which usually accompanies a banner revealing the server software being used.

Basic Response Statistics
When connecting to an MX server, a number of different responses are possible. The remote server may not be up and running or completely refusing connections, it may not respond back with a "220 " line in the amount of time we wait, nor will it always provide a banner that identifies the type of software running.

Description> Number of Servers Percent
Total Number of MX Servers Queried2,289,478   100.0%
Number of Servers that didn't respond387,18516.91%
    Server didn't open socket378,73216.54%
    Server didn't provide banner8,4530.37%
Server provided banner1,902,29383.09%
Server banner identifies software in use1,084,29547.36%

As indicated by the above table, of the 2,289,478 servers queried, only 1,084,295 servers responded with a banner that allow us to identify the software being used. All of the remaining information in this report is based on the responses that allowed us to identify the software in use.

Basic Technology Breakdown
Server Type Number of Servers Percent
Exim576,00253.12%
Postfix328,65430.31%
Sendmail83,2037.67%
Microsoft32,4512.99%
MailEnable29,0142.68%
MDaemon17,4011.60%
IMail4,1020.38%
CommuniGate Pro2,4710.23%
Lotus Domino2,3350.22%
WinWebMail1,7170.16%
XMail1,5770.15%
Qmail Toaster1,2410.11%
Kerio8500.08%
SurgeSMTP8210.08%
Merak5840.05%
ArGoSoft3830.04%
MagicMail2590.02%
Post.Office2280.02%
GroupWise2190.02%
Gordano Messaging Suite (GMS)1960.02%
OpenSMTPD1600.01%
Trend Micro1430.01%
InterScan VirusWall660.01%
Mirapoint590.01%
VisNetic460.00%
Mercury260.00%
OpenVMS180.00%
Interscan150.00%
WebSTAR V120.00%
Neon Mail Server120.00%
ModusMail90.00%
NetIQ MailMarshal70.00%
MessageWall60.00%
WebSTAR40.00%
MAILsweeper40.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (576,002 servers)

Version Number of Servers Percent
4.85236,91141.13%
4.82180,96831.42%
4.8457,77710.03%
4.8020,8103.61%
4.80.120,2343.51%
4.7616,8862.93%
4.7216,0512.79%
4.697,8051.36%
Other18,5603.22%

Postfix (328,654 servers)

Version Number of Servers Percent
Other328,654100.00%

Sendmail (83,203 servers)

Version Number of Servers Percent
8.13.817,85921.46%
8.14.517,77521.36%
8.14.414,30317.19%
8.13.110,43812.55%
8.14.35,8437.02%
8.12.11.200603082,0342.44%
8.13.6.200606141,8312.20%
8.14.71,8272.20%
8.14.91,3551.63%
8.14.21,1091.33%
8.11.69631.16%
8.12.109051.09%
8.14.18331.00%
Other6,1287.37%

Microsoft (32,451 servers)

Version Number of Servers Percent
6.0.3790.467524,66576.01%
6.0.3790.39592,6638.21%
7.5.7601.175142,0856.43%
6.0.3790.18307392.28%
7.0.6002.182643911.20%
5.0.2195.73813411.05%
Other1,5674.83%

MailEnable (29,014 servers)

Version Number of Servers Percent
1.986--2,2657.81%
6.5--2,0377.02%
5.10--1,1013.79%
8.53--1,1013.79%
8.51--1,0313.55%
8.04--9593.31%
4.26--8122.80%
6.0--8022.76%
8.50--7492.58%
8.00--7362.54%
7.06--7152.46%
8.55--5011.73%
7.07--4651.60%
7.50--4351.50%
1.981--4301.48%
7.0--4241.46%
6.70--4031.39%
6.57--3901.34%
7.53--3891.34%
8.56--3801.31%
8.60-8.60-3251.12%
8.60--8.603151.09%
Other12,24942.22%

MDaemon (17,401 servers)

Version Number of Servers Percent
14.5.32,24912.92%
14.5.21,2076.94%
11.0.39665.55%
11.0.08644.97%
13.5.18234.73%
13.0.48154.68%
13.0.57314.20%
14.0.37264.17%
14.0.24862.79%
10.0.04322.48%
12.5.64242.44%
10.1.23441.98%
12.5.43091.78%
13.6.23051.75%
10.1.12891.66%
14.5.02831.63%
13.6.02611.50%
9.6.12311.33%
14.5.12311.33%
13.5.22291.32%
9.6.62271.30%
9.6.22131.22%
10.1.02111.21%
13.0.22071.19%
13.0.32071.19%
14.0.01831.05%
Other3,94822.69%

IMail (4,102 servers)

Version Number of Servers Percent
8.2245711.14%
12.3.0.1003939.58%
12.4.2.273538.61%
12.5.1.603207.80%
9.232506.09%
12.2.0.2352365.75%
8.152085.07%
12.4.1.151934.71%
8.051724.19%
11.51413.44%
11.031202.93%
12.5.0.2461072.61%
12.4.0.166832.02%
11.01741.80%
7.15741.80%
10.02701.71%
11.02671.63%
12.4.1.9641.56%
6.06611.49%
7.07601.46%
12.5.0.248541.32%
8.00501.22%
12.1.0.270421.02%
Other45311.04%

CommuniGate Pro (2,471 servers)

Version Number of Servers Percent
5.1.162399.67%
6.0.92018.13%
6.0.111345.42%
6.0.101204.86%
5.4.11883.56%
5.2.20863.48%
6.0.7843.40%
6.0.8612.47%
4.1.8572.31%
5.3.13552.23%
5.3.15542.19%
6.0.5522.10%
5.2.3491.98%
5.0.14491.98%
6.1.1481.94%
5.1.12391.58%
5.2.16341.38%
5.4.4331.34%
4.2.10321.30%
5.4.1321.30%
5.4.6311.25%
5.4.10301.21%
5.4.8291.17%
6.0.1291.17%
5.2.19281.13%
6.1.0271.09%
Other75030.35%

Lotus Domino (2,335 servers)

Version Number of Servers Percent
8.5.336115.46%
8.5.3FP625911.09%
8.5.21175.01%
8.5.3FP3994.24%
8.5.1923.94%
7.0.2773.30%
8.5.3FP2753.21%
8.5.2FP4743.17%
8.5.2FP2642.74%
8.5632.70%
8.5.3FP5612.61%
8.5.3FP4602.57%
8.5.3FP1592.53%
8.5.2FP3522.23%
7.0.3482.06%
7.0431.84%
8.5.1FP5391.67%
8.0.1341.46%
7.0.1341.46%
6.5.3341.46%
8.0321.37%
8.5.2FP1311.33%
6.5.1301.28%
8.0.2291.24%
6.5.4291.24%
6.5261.11%
Other41317.69%

WinWebMail (1,717 servers)

Version Number of Servers Percent
3.8.1.331418.29%
3.9.0.719211.18%
3.7.6.11518.79%
3.8.0.11428.27%
3.9.0.11206.99%
3.8.1.51015.88%
3.8.1.1895.18%
3.8.5.1885.13%
3.8.6.1865.01%
3.7.3.1814.72%
3.7.7.3704.08%
3.7.1.1472.74%
3.8.2.1462.68%
3.8.3.1291.69%
3.7.5.1231.34%
3.9.0.5221.28%
3.7.0.3201.16%
3.7.0.5191.11%
Other774.48%

XMail (1,577 servers)

Version Number of Servers Percent
1.2757236.27%
1.2245528.85%
1.2519912.62%
1.261308.24%
1.24764.82%
1.21382.41%
1.23241.52%
1.20181.14%
1.17161.01%
Other493.11%

Qmail Toaster (1,241 servers)

Version Number of Servers Percent
1.31,17794.84%
1.2221.77%
1.03.5151.21%
Other272.18%

Kerio (850 servers)

Version Number of Servers Percent
6.7.316619.53%
6.7.08810.35%
6.6.2768.94%
6.5.0667.76%
6.5.2617.18%
6.7.2516.00%
6.4.1455.29%
6.3.1414.82%
6.6.1394.59%
6.7.1354.12%
6.5.1252.94%
6.3.0232.71%
6.4.0202.35%
6.4.2161.88%
6.6.0141.65%
6.0.10101.18%
6.1.3101.18%
6.2.091.06%
Other556.47%

SurgeSMTP (821 servers)

Version Number of Servers Percent
6.7c-117020.71%
6.5a2-213516.44%
6.5a-1597.19%
6.3c2-2536.46%
6.8g-1344.14%
5.2a-1323.90%
6.4a-1263.17%
5.3h2-2253.05%
3.9e-1232.80%
3.8k4-4202.44%
6.8h-8151.83%
6.1c-1141.71%
6.8h-28131.58%
4.0u4-4121.46%
6.8c-1101.22%
6.0a5-591.10%
4.2d2-291.10%
Other16219.73%

Merak (584 servers)

Version Number of Servers Percent
8.0.319833.90%
8.9.17512.84%
8.5.0498.39%
8.3.8345.82%
7.5.2315.31%
7.6.4244.11%
7.4.5244.11%
7.6.1132.23%
8.3.15111.88%
7.0.1111.88%
7.2.0101.71%
9.0.091.54%
8.9.081.37%
7.4.281.37%
8.2.471.20%
7.1.661.03%
6.2.161.03%
Other6010.27%

ArGoSoft (383 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)10427.15%
1.8 (1.8.9.5)5614.62%
1.8 (1.8.9.3)5113.32%
1.8 (1.8.9.1)338.62%
1.8 (1.8.8.7)246.27%
1.8 (1.8.8.8)215.48%
1.8 (1.8.9.2)112.87%
1.8 (1.8.9.4)92.35%
1.8 (1.8.7.3)71.83%
1.8 (1.8.6.0)71.83%
1.8 (1.8.8.9)51.31%
1.8 (1.8.8.2)41.04%
Other5113.32%

MagicMail (259 servers)

Version Number of Servers Percent
Other259100.00%

Post.Office (228 servers)

Version Number of Servers Percent
4.2.24017.54%
3.5.33615.79%
4.1.2.43013.16%
4.1.0.2125.26%
4.1.1114.82%
4.2.1.393.95%
4.0.183.51%
4.2.1.162.63%
4.1.0.362.63%
3.9.2.362.63%
4.262.63%
3.5.3J52.19%
4.352.19%
3.8.7.441.75%
3.9.141.75%
3.1.241.75%
4.1.0.431.32%
4.1.2.331.32%
3.9.231.32%
3.5.131.32%
3.9.1.231.32%
Other219.21%

GroupWise (219 servers)

Version Number of Servers Percent
7.0.33214.61%
14.0.12310.50%
8.0.22210.05%
6.5.7219.59%
8.0.3188.22%
7.0.4146.39%
7.0.2125.48%
14.0.0104.57%
12.0.2104.57%
6.5.694.11%
6.5.483.65%
7.0.162.74%
6.0.452.28%
14.0.241.83%
12.0.031.37%
6.5.531.37%
8.0.031.37%
12.0.331.37%
Other135.94%

Gordano Messaging Suite (GMS) (196 servers)

Version Number of Servers Percent
Other196100.00%

OpenSMTPD (160 servers)

Version Number of Servers Percent
Other160100.00%

Trend Micro (143 servers)

Version Number of Servers Percent
5.75538.46%
5.52618.18%
5.182517.48%
7.0139.09%
7.1106.99%
8.542.80%
3.5332.10%
7.521.40%
Other53.50%

InterScan VirusWall (66 servers)

Version Number of Servers Percent
Other66100.00%

Mirapoint (59 servers)

Version Number of Servers Percent
4.3.5-GA915.25%
4.3.6-GA58.47%
4.4.2a-FCS58.47%
4.4.3-GA58.47%
4.1.10-GA46.78%
4.4.5-GA46.78%
4.4.4-GA35.08%
4.1.5-GA23.39%
4.4.5a-GA23.39%
3.10.10a-GA23.39%
4.4.6-GA23.39%
4.3.3-GA23.39%
3.8.4-GA23.39%
4.3.7-GA23.39%
3.8.7a11.69%
3.10.2-GA11.69%
3.10.4-GA11.69%
4.2.3-GA11.69%
3.7.5a-GA11.69%
4.1.6-GA11.69%
4.1.9-GA11.69%
3.4.6-GR11.69%
4.1.3-GA11.69%
3.8.5-GA11.69%
Other00.00%

VisNetic (46 servers)

Version Number of Servers Percent
9.3.2.01021.74%
9.1.4.1613.04%
8.5.0.848.70%
6.2.2.036.52%
5.3.5.024.35%
5.8.6.624.35%
9.1.4.024.35%
7.2.4.124.35%
7.6.1.024.35%
5.5.8.324.35%
5.0.2.324.35%
9.1.4.1 provided by Techfount Systems Pte Ltd12.17%
7.2.4.012.17%
5.0.2.012.17%
8.3.0.112.17%
5.4.512.17%
8.0.3.112.17%
8.0.312.17%
8.5.0.512.17%
5.4.5.412.17%
Other00.00%

Mercury (26 servers)

Version Number of Servers Percent
1.481350.00%
3.321142.31%
3.2113.85%
4.x13.85%
Other00.00%

OpenVMS (18 servers)

Version Number of Servers Percent
8.3844.44%
7.3633.33%
8.4422.22%
Other00.00%

Interscan (15 servers)

Version Number of Servers Percent
3.55 (build 1029)320.00%
3.81-Build_1084213.33%
3.81-Build_1022213.33%
3.5 (build 1294)16.67%
3.8-Build_301316.67%
3.55 (build 1020)16.67%
3.53 (build 1493)16.67%
3.53 (build 2013)16.67%
3.53 (build 2017)16.67%
3.55 (build 1016)16.67%
3.8-Build_108016.67%
Other00.00%

WebSTAR V (12 servers)

Version Number of Servers Percent
5.4.1650.00%
5.4.0433.33%
5.3.318.33%
5.3.418.33%
Other00.00%

Neon Mail Server (12 servers)

Version Number of Servers Percent
3.0.7433.33%
3.1.2216.67%
3.1.318.33%
3.1.018.33%
3.0.818.33%
3.1.418.33%
3.0.618.33%
3.0.918.33%
Other00.00%

ModusMail (9 servers)

Version Number of Servers Percent
4.35.477.0666.67%
4.1.361.21111.11%
3.2.315.0111.11%
4.35.477.8111.11%
Other00.00%

NetIQ MailMarshal (7 servers)

Version Number of Servers Percent
6.0.3.8342.86%
5.5.6.5228.57%
5.5.4.17114.29%
5.5.6.7114.29%
Other00.00%

MessageWall (6 servers)

Version Number of Servers Percent
1.0.86100.00%
Other00.00%

WebSTAR (4 servers)

Version Number of Servers Percent
Other4100.00%

MAILsweeper (4 servers)

Version Number of Servers Percent
4.3.17.0250.00%
4.3.19.0125.00%
4.3.20.0125.00%
Other00.00%



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