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Mail (MX) Server Survey
November 1st, 2011

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 Queried2,321,080   100.0%
Number of Servers that didn't respond379,40816.35%
    Server didn't open socket367,01515.81%
    Server didn't provide banner12,3930.53%
Server provided banner1,941,67283.65%
Server banner identifies software in use1,059,53345.65%

As indicated by the above table, of the 2,321,080 servers queried, only 1,059,533 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
Exim448,93742.37%
Postfix246,80723.29%
Microsoft136,02212.84%
Sendmail134,97412.74%
MailEnable33,4973.16%
MDaemon21,9972.08%
IMail10,0260.95%
Lotus Domino5,0570.48%
WinWebMail4,2790.40%
CommuniGate Pro3,5040.33%
XMail2,4690.23%
Kerio2,3600.22%
Merak1,8160.17%
Qmail Toaster1,7330.16%
SurgeSMTP1,2670.12%
ArGoSoft1,0690.10%
GroupWise8610.08%
Trend Micro5270.05%
Post.Office4550.04%
Gordano Messaging Suite (GMS)4530.04%
MagicMail3610.03%
Mirapoint2450.02%
VisNetic2180.02%
InterScan VirusWall1840.02%
Interscan800.01%
NetIQ MailMarshal740.01%
Mercury640.01%
Neon Mail Server480.00%
WebSTAR V430.00%
MessageWall230.00%
OpenVMS220.00%
WebSTAR200.00%
ModusMail180.00%
OpenSMTPD130.00%
MAILsweeper100.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (448,937 servers)

Version Number of Servers Percent
4.69355,85379.27%
4.7639,8058.87%
4.7220,9194.66%
4.679,2912.07%
4.635,9911.33%
4.714,5041.00%
Other12,5742.80%

Postfix (246,807 servers)

Version Number of Servers Percent
Other246,807100.00%

Microsoft (136,022 servers)

Version Number of Servers Percent
6.0.3790.4675104,64376.93%
6.0.3790.395919,77314.54%
6.0.3790.18305,5024.04%
5.0.2195.73811,7031.25%
Other4,4013.24%

Sendmail (134,974 servers)

Version Number of Servers Percent
8.13.832,19823.85%
8.13.123,37517.32%
8.14.418,94114.03%
8.14.318,04213.37%
8.12.11.200603086,2494.63%
8.13.6.200606144,6703.46%
8.14.23,7862.80%
8.11.63,3152.46%
8.12.103,1582.34%
8.13.62,7782.06%
8.14.12,6821.99%
8.12.11.200606142,3091.71%
8.13.72,0061.49%
8.12.111,8411.36%
8.14.51,6441.22%
8.12.81,5951.18%
8.13.41,5631.16%
Other4,8223.57%

MailEnable (33,497 servers)

Version Number of Servers Percent
1.986--9,92829.64%
4.26--2,6948.04%
1.981--2,0176.02%
1.983--1,2783.82%
5.10--1,2743.80%
0-3.63-8682.59%
3.62--8652.58%
5.11--7562.26%
5.51--6501.94%
4.22--5371.60%
0-5.51-5321.59%
0-4.26-5291.58%
4.23--4741.42%
0-1.87-4261.27%
0-2.53-3841.15%
--3.633691.10%
1.95--3651.09%
1.96--3541.06%
4.14--3501.04%
5.51--5.513401.02%
Other8,50725.40%

MDaemon (21,997 servers)

Version Number of Servers Percent
11.0.33,09414.07%
12.0.42,94513.39%
12.0.31,9518.87%
11.0.01,2535.70%
10.1.21,0614.82%
10.0.01,0324.69%
10.1.18213.73%
9.6.16152.80%
9.6.65892.68%
10.1.05122.33%
12.0.14972.26%
9.5.23971.80%
9.6.53921.78%
12.0.03821.74%
10.0.53791.72%
9.6.23551.61%
10.0.23551.61%
9.5.13361.53%
9.5.63191.45%
9.6.43051.39%
8.1.32941.34%
12.0.22901.32%
10.0.42801.27%
9.0.42721.24%
11.0.22441.11%
Other3,02713.76%

IMail (10,026 servers)

Version Number of Servers Percent
8.221,90919.04%
11.51,34513.42%
8.156926.90%
11.036276.25%
9.235715.70%
11.014944.93%
8.054174.16%
11.024034.02%
9.103953.94%
9.203623.61%
10.023073.06%
11.03013.00%
7.072562.55%
7.152292.28%
8.001891.89%
6.061811.81%
10.011491.49%
9.211251.25%
8.041181.18%
Other9569.54%

Lotus Domino (5,057 servers)

Version Number of Servers Percent
8.5.258011.47%
8.5.2FP24889.65%
8.5.13496.90%
8.5.2FP32745.42%
7.0.22705.34%
8.5.2FP12454.84%
8.52354.65%
7.0.31593.14%
8.0.11302.57%
8.0.21302.57%
7.0.11272.51%
8.5.1FP51232.43%
6.5.41102.18%
6.5.11082.14%
8.5.1FP3961.90%
6.5.3931.84%
8.0881.74%
7.0831.64%
6.5.5751.48%
7.0.2FP2751.48%
8.5.3731.44%
8.5.1FP4671.32%
6.5671.32%
7.0.3FP1671.32%
8.5.1FP2631.25%
Other88217.44%

WinWebMail (4,279 servers)

Version Number of Servers Percent
3.8.1.31,03624.21%
3.8.0.176117.78%
3.7.6.158813.74%
3.8.1.13828.93%
3.7.7.33808.88%
3.7.3.13748.74%
3.7.1.11874.37%
3.7.5.11363.18%
3.7.7.11122.62%
3.6.3.1912.13%
3.7.0.5731.71%
3.7.0.3711.66%
3.7.0.7591.38%
Other290.68%

CommuniGate Pro (3,504 servers)

Version Number of Servers Percent
5.1.162727.76%
5.4.12507.13%
4.1.81805.14%
5.3.131534.37%
5.2.201293.68%
5.3.81002.85%
5.2.16982.80%
5.4.0962.74%
4.2.10932.65%
5.2.19792.25%
5.3.12742.11%
5.2.3732.08%
5.1.12712.03%
5.0.14702.00%
5.3.10661.88%
5.3.14651.86%
5.2.14641.83%
5.4611.74%
5.3.9611.74%
5.2.12571.63%
5.1.13521.48%
5.3.11511.46%
5.2.8501.43%
5.2.13421.20%
5.3.7401.14%
5.3.2371.06%
5.2.0371.06%
5.2.10361.03%
Other1,04729.88%

XMail (2,469 servers)

Version Number of Servers Percent
1.2259824.22%
1.2549019.85%
1.2741716.89%
1.2632012.96%
1.2424910.09%
1.211064.29%
1.23632.55%
1.20532.15%
1.17411.66%
1.12341.38%
Other983.97%

Kerio (2,360 servers)

Version Number of Servers Percent
6.7.332713.86%
6.6.225010.59%
6.7.02199.28%
6.7.21606.78%
6.5.01596.74%
6.5.21536.48%
6.4.11315.55%
6.7.11295.47%
6.3.11215.13%
6.4.0923.90%
6.6.0893.77%
6.5.1763.22%
6.6.1692.92%
6.4.2532.25%
6.3.0391.65%
6.2.0281.19%
6.1.0251.06%
6.2.2251.06%
6.1.3251.06%
Other1908.05%

Merak (1,816 servers)

Version Number of Servers Percent
8.0.372840.09%
8.9.11789.80%
8.5.01357.43%
7.5.2824.52%
7.6.4734.02%
8.3.8693.80%
7.4.5653.58%
8.2.13482.64%
9.0.0321.76%
7.4.2291.60%
7.2.0241.32%
8.2.4241.32%
8.3.15231.27%
7.6.1231.27%
7.0.1221.21%
8.9.0191.05%
Other24213.33%

Qmail Toaster (1,733 servers)

Version Number of Servers Percent
1.31,62393.65%
1.2764.39%
1.0201.15%
Other140.81%

SurgeSMTP (1,267 servers)

Version Number of Servers Percent
5.3h2-226420.84%
5.2a-120516.18%
3.9e-1967.58%
4.2d4-4886.95%
4.0u4-4534.18%
5.0e4-4514.03%
5.3h-1463.63%
3.8k4-4433.39%
4.2d2-2282.21%
3.8i3-3251.97%
4.3g2-2231.82%
5.0e3-3191.50%
3.7b8-8181.42%
5.1c2-2171.34%
3.9c-1161.26%
4.3g4-4161.26%
3.6f5-5161.26%
3.9h-18151.18%
4.2a3-3151.18%
4.3e-1141.10%
5.1c-1131.03%
Other18614.68%

ArGoSoft (1,069 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)24122.54%
1.8 (1.8.9.5)16915.81%
1.8 (1.8.9.3)13612.72%
1.8 (1.8.9.1)1019.45%
1.8 (1.8.8.8)827.67%
1.8 (1.8.8.7)635.89%
1.8 (1.8.9.2)434.02%
1.8 (1.8.9.4)292.71%
1.8 (1.8.8.1)171.59%
1.8 (1.8.8.9)171.59%
1.8 (1.8.6.0)161.50%
1.8 (1.8.9.0)131.22%
Other14213.28%

GroupWise (861 servers)

Version Number of Servers Percent
7.0.319823.00%
8.0.217219.98%
6.5.79110.57%
7.0.2667.67%
8.0.1576.62%
7.0.4546.27%
6.5.4364.18%
7.0.1343.95%
6.0.4273.14%
6.5.6252.90%
6.5.1212.44%
8.0.0182.09%
6.5.5161.86%
7.0121.39%
Other343.95%

Trend Micro (527 servers)

Version Number of Servers Percent
5.722041.75%
5.513325.24%
5.189518.03%
7.0499.30%
7.1163.04%
Other142.66%

Post.Office (455 servers)

Version Number of Servers Percent
3.5.37416.26%
4.1.0.25010.99%
4.0.1398.57%
4.1.2.4306.59%
4.1.1224.84%
3.5.3J204.40%
3.9.2.3183.96%
3.8.3163.52%
3.9.2132.86%
3.1.2J112.42%
4.1.0.3102.20%
3.1.2102.20%
3.6.2102.20%
3.9.181.76%
3.8.7.481.76%
4.0.1.181.76%
4.1.0.481.76%
4.271.54%
3.9.2.171.54%
4.0.0.271.54%
4.1.2.371.54%
4.1.2.271.54%
4.0.0.161.32%
4.161.32%
3.9.1.351.10%
3.5.151.10%
3.9.1.251.10%
Other388.35%

Gordano Messaging Suite (GMS) (453 servers)

Version Number of Servers Percent
Other453100.00%

MagicMail (361 servers)

Version Number of Servers Percent
Other361100.00%

Mirapoint (245 servers)

Version Number of Servers Percent
4.2.3-GA2811.43%
3.10.10a-GA249.80%
3.8.4-GA228.98%
3.10.5-GA197.76%
3.8.3-GA187.35%
3.10.8-GA145.71%
4.1.10-GA145.71%
4.1.3-GA124.90%
3.10.9-GA124.90%
4.1.9-GA104.08%
3.10.7-GA93.67%
3.10.3-GA72.86%
3.8.7a62.45%
4.1.4-GA62.45%
3.8.2-GA62.45%
4.1.8-GA52.04%
3.10.4-GA41.63%
3.8.5-GA41.63%
4.1.5-GA31.22%
3.10.6-GA31.22%
3.7.5a-GA31.22%
3.8.6-GA31.22%
Other135.31%

VisNetic (218 servers)

Version Number of Servers Percent
9.3.2.07534.40%
9.1.4.13114.22%
5.8.6.6156.88%
8.5.0.8115.05%
8.0.3.173.21%
5.5.8.373.21%
7.6.1.062.75%
8.0.362.75%
5.3.5.052.29%
6.2.2.052.29%
8.0.3.052.29%
8.3.5.052.29%
5.0.2.352.29%
7.2.4.141.83%
9.1.4.041.83%
5.0.2.141.83%
5.4.5.431.38%
Other209.17%

InterScan VirusWall (184 servers)

Version Number of Servers Percent
Other184100.00%

Interscan (80 servers)

Version Number of Servers Percent
3.55 (build 1016)1620.00%
3.81-Build_10221012.50%
3.55 (build 1029)911.25%
3.53 (build 2017)810.00%
3.8-Build_301378.75%
3.81-Build_108467.50%
3.55 (build 1020)45.00%
3.53 (build 2011)45.00%
3.53 (build 1493)33.75%
3.52 (build 1375)33.75%
3.53 (build 2013)22.50%
3.8-Build_108022.50%
3.5 (build 1294)11.25%
3.51 (build 1321)11.25%
3.51 (build 1337)11.25%
3.81-Build_105511.25%
3.6-Build_124611.25%
3.8-Build_304511.25%
Other00.00%

NetIQ MailMarshal (74 servers)

Version Number of Servers Percent
6.0.3.85067.57%
5.5.6.779.46%
6.1.3.1568.11%
5.5.6.634.05%
5.5.6.522.70%
5.5.4.1622.70%
5.5.5.911.35%
5.5.4.1711.35%
5.5.3.1711.35%
5.5.5.611.35%
Other00.00%

Mercury (64 servers)

Version Number of Servers Percent
1.483250.00%
3.321726.56%
1.4734.69%
3.21c34.69%
3.2123.12%
3.01a23.12%
1.4411.56%
3.3111.56%
4.x11.56%
1.4911.56%
3.3011.56%
Other00.00%

Neon Mail Server (48 servers)

Version Number of Servers Percent
3.1.31122.92%
3.0.71020.83%
3.0.9612.50%
3.1.4510.42%
3.1.2510.42%
3.1.048.33%
3.0.624.17%
3.1.124.17%
3.1.524.17%
3.0.812.08%
Other00.00%

WebSTAR V (43 servers)

Version Number of Servers Percent
5.4.11944.19%
5.4.0920.93%
5.3.4613.95%
5.3.3511.63%
5.3.224.65%
5.3.012.33%
5.3.112.33%
Other00.00%

MessageWall (23 servers)

Version Number of Servers Percent
1.0.82295.65%
1.0.614.35%
Other00.00%

OpenVMS (22 servers)

Version Number of Servers Percent
8.3940.91%
7.3731.82%
8.4418.18%
6.114.55%
8.214.55%
Other00.00%

WebSTAR (20 servers)

Version Number of Servers Percent
Other20100.00%

ModusMail (18 servers)

Version Number of Servers Percent
4.35.477.0844.44%
4.35.480.0316.67%
4.1.361.2115.56%
4.2.425.2215.56%
3.2.315.015.56%
4.0.340.315.56%
4.3.459.015.56%
4.35.477.815.56%
3.1.302.015.56%
Other00.00%

OpenSMTPD (13 servers)

Version Number of Servers Percent
Other13100.00%

MAILsweeper (10 servers)

Version Number of Servers Percent
4.3.17.0330.00%
4.3.20.0220.00%
4.3.19.0220.00%
4.3.1.0110.00%
4.3.14.0110.00%
4.3.6.0110.00%
Other00.00%




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