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Mail (MX) Server Survey
August 1st, 2012

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 Queried2,387,923   100.0%
Number of Servers that didn't respond404,61616.94%
    Server didn't open socket392,63716.44%
    Server didn't provide banner11,9790.50%
Server provided banner1,983,30783.06%
Server banner identifies software in use1,083,54145.38%

As indicated by the above table, of the 2,387,923 servers queried, only 1,083,541 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
Exim498,69546.02%
Postfix267,05624.65%
Sendmail123,55311.40%
Microsoft108,1519.98%
MailEnable33,4253.08%
MDaemon21,1811.95%
IMail7,9840.74%
Lotus Domino4,7160.44%
WinWebMail3,7260.34%
CommuniGate Pro3,2450.30%
XMail2,2650.21%
Kerio1,8090.17%
Qmail Toaster1,6350.15%
Merak1,3580.13%
SurgeSMTP1,0770.10%
ArGoSoft8350.08%
GroupWise5760.05%
Trend Micro3920.04%
Post.Office3880.04%
Gordano Messaging Suite (GMS)3670.03%
MagicMail3240.03%
Mirapoint1830.02%
InterScan VirusWall1480.01%
VisNetic1420.01%
Mercury540.00%
Interscan510.00%
NetIQ MailMarshal470.00%
WebSTAR V330.00%
Neon Mail Server300.00%
MessageWall210.00%
OpenSMTPD210.00%
OpenVMS190.00%
WebSTAR140.00%
ModusMail140.00%
MAILsweeper60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (498,695 servers)

Version Number of Servers Percent
4.77348,85069.95%
4.6950,33910.09%
4.7644,4798.92%
4.7222,7304.56%
4.676,7671.36%
4.635,2911.06%
Other20,2394.06%

Postfix (267,056 servers)

Version Number of Servers Percent
Other267,056100.00%

Sendmail (123,553 servers)

Version Number of Servers Percent
8.13.833,02226.73%
8.13.119,22715.56%
8.14.316,30713.20%
8.14.512,35710.00%
8.14.411,1309.01%
8.12.11.200603084,8753.95%
8.13.6.200606143,8953.15%
8.14.23,6052.92%
8.11.62,5502.06%
8.12.102,2751.84%
8.14.12,0541.66%
8.13.61,8921.53%
8.13.71,6341.32%
8.12.11.200606141,5951.29%
8.12.111,3891.12%
Other5,7464.65%

Microsoft (108,151 servers)

Version Number of Servers Percent
6.0.3790.467586,42479.91%
6.0.3790.395912,84411.88%
6.0.3790.18303,4803.22%
7.5.7601.175141,3831.28%
5.0.2195.73811,2211.13%
Other2,7992.59%

MailEnable (33,425 servers)

Version Number of Servers Percent
1.986--7,93223.73%
5.10--2,6397.90%
4.26--2,4327.28%
1.981--1,4604.37%
6.0--1,1343.39%
1.983--9092.72%
6.03--7892.36%
0-3.63-7592.27%
5.51--6832.04%
3.62--6551.96%
5.11--5911.77%
6.53--5681.70%
6.5--4861.45%
4.22--3861.15%
0-1.87-3801.14%
0-4.26-3751.12%
Other11,24733.65%

MDaemon (21,181 servers)

Version Number of Servers Percent
12.5.63,49316.49%
11.0.32,51411.87%
11.0.01,3196.23%
12.5.41,1725.53%
10.0.08383.96%
10.1.27993.77%
10.1.17083.34%
12.5.36953.28%
12.0.35742.71%
9.6.15322.51%
9.6.64872.30%
10.1.04632.19%
12.5.24532.14%
12.0.44071.92%
9.6.23271.54%
9.5.23201.51%
10.0.53201.51%
9.6.53021.43%
9.5.12641.25%
10.0.22601.23%
9.5.62551.20%
12.5.52481.17%
9.6.42381.12%
12.0.12321.10%
8.1.32281.08%
12.0.02271.07%
Other3,50616.55%

IMail (7,984 servers)

Version Number of Servers Percent
8.221,53819.26%
11.51,15414.45%
9.235026.29%
11.035016.28%
8.154886.11%
11.014245.31%
12.0.0.3843294.12%
8.053073.85%
10.022543.18%
11.02162.71%
7.072092.62%
12.0.0.3482012.52%
11.021802.25%
6.061471.84%
12.1.0.2701391.74%
10.011361.70%
7.151331.67%
8.001301.63%
9.21971.21%
9.10891.11%
Other81010.15%

Lotus Domino (4,716 servers)

Version Number of Servers Percent
8.5.380016.96%
8.5.23717.87%
8.5.2FP23006.36%
8.5.3FP12966.28%
8.5.12485.26%
7.0.22054.35%
8.51863.94%
8.5.2FP31703.60%
7.0.31272.69%
8.5.2FP11222.59%
7.0.11002.12%
8.0.1992.10%
8.5.1FP5982.08%
8.5.2FP4972.06%
6.5.4861.82%
8.0.2851.80%
6.5.1781.65%
6.5.3751.59%
7.0721.53%
8.0661.40%
8.5.1FP4581.23%
8.5.1FP3551.17%
6.5.5541.15%
6.5521.10%
7.0.3FP1521.10%
7.0.2FP2491.04%
Other71515.16%

WinWebMail (3,726 servers)

Version Number of Servers Percent
3.8.1.376720.59%
3.8.0.154014.49%
3.7.6.142611.43%
3.8.1.538910.44%
3.7.3.12947.89%
3.7.7.32787.46%
3.8.1.12757.38%
3.8.2.12045.48%
3.7.1.11433.84%
3.7.5.11062.84%
3.6.3.1691.85%
3.7.7.1651.74%
3.7.0.5541.45%
3.7.0.3521.40%
3.7.0.7451.21%
Other190.51%

CommuniGate Pro (3,245 servers)

Version Number of Servers Percent
5.1.162608.01%
5.4.51976.07%
5.4.41785.49%
4.1.81424.38%
5.2.201233.79%
5.4.1983.02%
5.3.13962.96%
5.4.6912.80%
5.4.2842.59%
4.2.10812.50%
5.2.16802.47%
5.4.3682.10%
5.0.14662.03%
5.1.12652.00%
5.2.3652.00%
5.2.19621.91%
5.3.15551.69%
5.2.14541.66%
5.2.12491.51%
5.4.0481.48%
5.3.8461.42%
5.3.9441.36%
5.1.13421.29%
5.3.12411.26%
5.4401.23%
5.3.10371.14%
5.2.13371.14%
Other99630.69%

XMail (2,265 servers)

Version Number of Servers Percent
1.2755924.68%
1.2252923.36%
1.2541018.10%
1.2626411.66%
1.242018.87%
1.21823.62%
1.23532.34%
1.20401.77%
1.17321.41%
1.12231.02%
Other723.18%

Kerio (1,809 servers)

Version Number of Servers Percent
6.7.328515.75%
6.6.21799.89%
6.7.01649.07%
6.5.01347.41%
6.5.21236.80%
6.7.21055.80%
6.4.11025.64%
6.7.1915.03%
6.3.1854.70%
6.4.0713.92%
6.6.0663.65%
6.5.1633.48%
6.6.1593.26%
6.4.2382.10%
6.3.0331.82%
6.2.0231.27%
Other18810.39%

Qmail Toaster (1,635 servers)

Version Number of Servers Percent
1.31,55495.05%
1.2503.06%
Other311.90%

Merak (1,358 servers)

Version Number of Servers Percent
8.0.354440.06%
8.9.114410.60%
8.5.0987.22%
7.5.2624.57%
7.6.4584.27%
8.3.8574.20%
7.4.5513.76%
9.0.0261.91%
7.4.2251.84%
7.2.0191.40%
8.2.4191.40%
8.9.0191.40%
8.3.15181.33%
7.6.1181.33%
6.2.1171.25%
4.4.2161.18%
7.0.1161.18%
Other15111.12%

SurgeSMTP (1,077 servers)

Version Number of Servers Percent
5.3h2-219317.92%
5.2a-112011.14%
6.0a5-51009.29%
3.9e-1746.87%
6.0a4-4716.59%
6.1c-1514.74%
3.8k4-4343.16%
4.0u4-4282.60%
5.0e4-4222.04%
4.2d2-2201.86%
5.3h-1201.86%
4.3g2-2181.67%
3.8i3-3171.58%
5.0e3-3161.49%
4.2d4-4141.30%
6.0a3-3141.30%
3.7b8-8131.21%
3.9h-18131.21%
3.9c-1131.21%
3.6f5-5131.21%
4.3e-1121.11%
Other20118.66%

ArGoSoft (835 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)19923.83%
1.8 (1.8.9.5)12214.61%
1.8 (1.8.9.3)10512.57%
1.8 (1.8.9.1)829.82%
1.8 (1.8.8.8)556.59%
1.8 (1.8.8.7)495.87%
1.8 (1.8.9.2)344.07%
1.8 (1.8.9.4)242.87%
1.8 (1.8.8.1)151.80%
1.8 (1.8.6.0)141.68%
1.8 (1.8.8.9)141.68%
1.8 (1.8.9.0)101.20%
Other11213.41%

GroupWise (576 servers)

Version Number of Servers Percent
8.0.212822.22%
7.0.311319.62%
6.5.76310.94%
7.0.4427.29%
7.0.2386.60%
8.0.1305.21%
7.0.1233.99%
6.5.4233.99%
6.5.6203.47%
6.5.1162.78%
6.0.4152.60%
12.0.0132.26%
8.0.091.56%
7.081.39%
6.5.581.39%
8.0.361.04%
Other213.65%

Trend Micro (392 servers)

Version Number of Servers Percent
5.715840.31%
5.59925.26%
5.186817.35%
7.0379.44%
7.1194.85%
Other112.81%

Post.Office (388 servers)

Version Number of Servers Percent
3.5.35614.43%
4.1.0.24010.31%
4.0.1297.47%
4.1.2.4246.19%
4.1.1174.38%
3.9.2.3174.38%
3.5.3J143.61%
3.9.2123.09%
4.2112.84%
3.8.3112.84%
3.1.2J102.58%
3.1.2102.58%
4.1.0.3102.58%
3.8.7.492.32%
4.0.1.182.06%
4.1.0.471.80%
4.1.2.371.80%
4.1.2.271.80%
4.2.1.161.55%
3.9.161.55%
3.6.261.55%
3.9.1.261.55%
4.2.151.29%
4.0.0.151.29%
3.9.1.351.29%
3.9.2.141.03%
4.141.03%
3.5.141.03%
3.9.2.241.03%
Other348.76%

Gordano Messaging Suite (GMS) (367 servers)

Version Number of Servers Percent
Other367100.00%

MagicMail (324 servers)

Version Number of Servers Percent
Other324100.00%

Mirapoint (183 servers)

Version Number of Servers Percent
3.10.10a-GA2010.93%
4.2.3-GA179.29%
4.1.10-GA168.74%
3.10.5-GA116.01%
4.1.9-GA116.01%
3.8.4-GA116.01%
4.1.3-GA94.92%
3.10.9-GA94.92%
3.10.8-GA84.37%
3.8.3-GA63.28%
3.10.7-GA63.28%
4.2.4-GA52.73%
3.8.5-GA52.73%
4.3.3-GA52.73%
3.8.6-GA42.19%
4.1.4-GA42.19%
4.1.8-GA42.19%
4.1.5-GA31.64%
3.10.3-GA31.64%
3.7.5a-GA31.64%
4.3.4-GA31.64%
3.8.7a31.64%
3.10.4-GA31.64%
3.8.2-GA21.09%
4.3.1a-FCS21.09%
4.0.5a21.09%
Other84.37%

InterScan VirusWall (148 servers)

Version Number of Servers Percent
Other148100.00%

VisNetic (142 servers)

Version Number of Servers Percent
9.3.2.03927.46%
9.1.4.11812.68%
8.5.0.8117.75%
5.8.6.685.63%
5.5.8.374.93%
8.0.3.164.23%
7.6.1.053.52%
8.0.353.52%
5.3.5.042.82%
6.2.2.042.82%
8.0.3.042.82%
7.2.4.142.82%
5.4.5.432.11%
9.1.4.032.11%
5.0.2.332.11%
5.0.2.121.41%
8.3.5.021.41%
Other149.86%

Mercury (54 servers)

Version Number of Servers Percent
1.483055.56%
3.321425.93%
3.01a23.70%
1.4723.70%
3.21c23.70%
3.2111.85%
1.4411.85%
4.x11.85%
3.3011.85%
Other00.00%

Interscan (51 servers)

Version Number of Servers Percent
3.55 (build 1016)1325.49%
3.81-Build_1022917.65%
3.55 (build 1029)611.76%
3.53 (build 2017)47.84%
3.8-Build_301347.84%
3.53 (build 2011)47.84%
3.53 (build 1493)35.88%
3.53 (build 2013)23.92%
3.81-Build_108423.92%
3.5 (build 1294)11.96%
3.51 (build 1337)11.96%
3.8-Build_304511.96%
3.8-Build_108011.96%
Other00.00%

NetIQ MailMarshal (47 servers)

Version Number of Servers Percent
6.0.3.83063.83%
5.5.6.7510.64%
6.1.3.1536.38%
5.5.6.524.26%
5.5.6.624.26%
5.5.5.612.13%
5.5.5.912.13%
5.5.4.1712.13%
5.5.4.1612.13%
5.5.3.1712.13%
Other00.00%

WebSTAR V (33 servers)

Version Number of Servers Percent
5.4.11751.52%
5.4.0927.27%
5.3.339.09%
5.3.226.06%
5.3.426.06%
Other00.00%

Neon Mail Server (30 servers)

Version Number of Servers Percent
3.0.7723.33%
3.1.3516.67%
3.1.0516.67%
3.1.4413.33%
3.1.2310.00%
3.0.926.67%
3.1.113.33%
3.0.813.33%
3.1.513.33%
3.0.613.33%
Other00.00%

MessageWall (21 servers)

Version Number of Servers Percent
1.0.82095.24%
1.0.614.76%
Other00.00%

OpenSMTPD (21 servers)

Version Number of Servers Percent
Other21100.00%

OpenVMS (19 servers)

Version Number of Servers Percent
8.3842.11%
7.3526.32%
8.4421.05%
6.115.26%
8.215.26%
Other00.00%

WebSTAR (14 servers)

Version Number of Servers Percent
Other14100.00%

ModusMail (14 servers)

Version Number of Servers Percent
4.35.477.0642.86%
4.35.480.0214.29%
4.1.361.2117.14%
3.2.315.017.14%
4.0.340.317.14%
4.3.459.017.14%
4.35.477.817.14%
3.1.302.017.14%
Other00.00%

MAILsweeper (6 servers)

Version Number of Servers Percent
4.3.17.0350.00%
4.3.19.0233.33%
4.3.20.0116.67%
Other00.00%




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