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Mail (MX) Server Survey
September 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 Queried2,440,105   100.0%
Number of Servers that didn't respond414,36016.98%
    Server didn't open socket402,40616.49%
    Server didn't provide banner11,9540.49%
Server provided banner2,025,74583.02%
Server banner identifies software in use1,108,55645.43%

As indicated by the above table, of the 2,440,105 servers queried, only 1,108,556 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
Exim514,01846.37%
Postfix274,50824.76%
Sendmail125,70411.34%
Microsoft107,4209.69%
MailEnable33,9723.06%
MDaemon21,4101.93%
IMail7,9290.72%
Lotus Domino4,8170.43%
WinWebMail3,6180.33%
CommuniGate Pro3,2930.30%
XMail2,2650.20%
Kerio1,7930.16%
Qmail Toaster1,6920.15%
Merak1,3540.12%
SurgeSMTP1,0950.10%
ArGoSoft8480.08%
GroupWise5630.05%
Post.Office3980.04%
Trend Micro3940.04%
Gordano Messaging Suite (GMS)3580.03%
MagicMail3210.03%
Mirapoint1830.02%
InterScan VirusWall1480.01%
VisNetic1470.01%
Interscan560.01%
Mercury520.00%
NetIQ MailMarshal440.00%
WebSTAR V320.00%
Neon Mail Server280.00%
MessageWall230.00%
OpenSMTPD220.00%
OpenVMS170.00%
ModusMail140.00%
WebSTAR140.00%
MAILsweeper60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (514,018 servers)

Version Number of Servers Percent
4.77357,81769.61%
4.7649,2549.58%
4.6944,8088.72%
4.7225,2734.92%
4.808,9541.74%
4.676,6081.29%
4.635,3031.03%
Other16,0013.11%

Postfix (274,508 servers)

Version Number of Servers Percent
Other274,508100.00%

Sendmail (125,704 servers)

Version Number of Servers Percent
8.13.833,68326.80%
8.13.119,73815.70%
8.14.316,48613.11%
8.14.512,87510.24%
8.14.411,3729.05%
8.12.11.200603084,9403.93%
8.13.6.200606143,8903.09%
8.14.23,6022.87%
8.11.62,5512.03%
8.12.102,2501.79%
8.14.12,0291.61%
8.13.61,8951.51%
8.12.11.200606141,8761.49%
8.13.71,6301.30%
8.12.111,3531.08%
Other5,5344.40%

Microsoft (107,420 servers)

Version Number of Servers Percent
6.0.3790.467585,90779.97%
6.0.3790.395912,50811.64%
6.0.3790.18303,4073.17%
7.5.7601.175141,5441.44%
5.0.2195.73811,2031.12%
Other2,8512.65%

MailEnable (33,972 servers)

Version Number of Servers Percent
1.986--7,84323.09%
5.10--2,6817.89%
4.26--2,4307.15%
1.981--1,4384.23%
6.0--1,2213.59%
1.983--8772.58%
6.03--7782.29%
6.5--7542.22%
0-3.63-7492.20%
5.51--6782.00%
3.62--6441.90%
6.53--5581.64%
5.11--5161.52%
0-4.26-3951.16%
0-1.87-3771.11%
4.22--3651.07%
Other11,66834.35%

MDaemon (21,410 servers)

Version Number of Servers Percent
12.5.64,21119.67%
11.0.32,45811.48%
11.0.01,3606.35%
12.5.49884.61%
10.0.08654.04%
10.1.27933.70%
10.1.17003.27%
12.5.36192.89%
12.0.35372.51%
9.6.15362.50%
9.6.64952.31%
10.1.04672.18%
12.5.24011.87%
12.0.43841.79%
9.5.23251.52%
9.6.23171.48%
10.0.53111.45%
9.6.52961.38%
10.0.22681.25%
9.5.12611.22%
9.5.62551.19%
9.6.42331.09%
8.1.32201.03%
12.0.12181.02%
12.0.02151.00%
Other3,67717.17%

IMail (7,929 servers)

Version Number of Servers Percent
8.221,45518.35%
11.51,06113.38%
9.235106.43%
8.154926.21%
12.1.0.2704645.85%
11.034275.39%
11.014145.22%
8.052963.73%
12.0.0.3842573.24%
10.022473.12%
11.02202.77%
7.072062.60%
12.0.0.3481892.38%
11.021692.13%
6.061471.85%
8.001381.74%
10.011341.69%
7.151341.69%
9.21951.20%
9.10851.07%
Other7899.95%

Lotus Domino (4,817 servers)

Version Number of Servers Percent
8.5.381816.98%
8.5.23878.03%
8.5.3FP12916.04%
8.5.2FP22896.00%
8.5.12445.07%
7.0.22134.42%
8.51693.51%
8.5.2FP31643.40%
7.0.31252.59%
8.5.2FP11132.35%
8.5.2FP41022.12%
8.5.1FP5992.06%
8.0.1972.01%
7.0.1961.99%
8.0.2921.91%
8.5.3FP2911.89%
6.5.4871.81%
6.5.1811.68%
7.0741.54%
6.5.3731.52%
8.0671.39%
6.5.5591.22%
8.5.1FP4551.14%
8.5.1FP3551.14%
6.5541.12%
7.0.3FP1501.04%
Other77216.03%

WinWebMail (3,618 servers)

Version Number of Servers Percent
3.8.1.375320.81%
3.8.0.151414.21%
3.7.6.140711.25%
3.8.1.536710.14%
3.7.3.12817.77%
3.7.7.32657.32%
3.8.1.12637.27%
3.8.2.12466.80%
3.7.1.11363.76%
3.7.5.11002.76%
3.6.3.1671.85%
3.7.7.1591.63%
3.7.0.3531.46%
3.7.0.5491.35%
3.7.0.7391.08%
Other190.53%

CommuniGate Pro (3,293 servers)

Version Number of Servers Percent
5.1.162678.11%
5.4.41675.07%
5.4.51634.95%
5.4.61594.83%
4.1.81424.31%
5.2.201193.61%
5.4.11003.04%
5.3.13962.92%
5.4.2852.58%
5.2.16832.52%
4.2.10782.37%
5.1.12672.03%
5.0.14651.97%
5.2.3651.97%
5.4.3621.88%
5.2.19621.88%
5.3.15621.88%
5.2.14501.52%
5.4.0501.52%
5.2.12461.40%
5.3.9441.34%
5.3.8421.28%
5.1.13401.21%
5.3.12381.15%
5.4381.15%
5.3.10381.15%
5.2.13361.09%
5.2.8331.00%
Other99630.25%

XMail (2,265 servers)

Version Number of Servers Percent
1.2758025.61%
1.2252323.09%
1.2540317.79%
1.2626411.66%
1.241868.21%
1.21873.84%
1.23512.25%
1.20391.72%
1.17361.59%
Other964.24%

Kerio (1,793 servers)

Version Number of Servers Percent
6.7.327415.28%
6.6.218410.26%
6.7.01629.04%
6.5.01287.14%
6.5.21246.92%
6.4.11055.86%
6.7.21005.58%
6.7.1874.85%
6.3.1824.57%
6.4.0734.07%
6.5.1673.74%
6.6.0653.63%
6.6.1573.18%
6.4.2382.12%
6.3.0362.01%
6.2.0211.17%
6.1.4181.00%
Other1729.59%

Qmail Toaster (1,692 servers)

Version Number of Servers Percent
1.31,60694.92%
1.2533.13%
1.0171.00%
Other160.95%

Merak (1,354 servers)

Version Number of Servers Percent
8.0.354139.96%
8.9.114610.78%
8.5.01007.39%
7.5.2634.65%
8.3.8584.28%
7.6.4574.21%
7.4.5513.77%
9.0.0261.92%
7.4.2241.77%
8.9.0191.40%
7.0.1181.33%
7.2.0181.33%
8.2.4181.33%
7.6.1181.33%
8.3.15161.18%
6.2.1161.18%
4.4.2141.03%
Other15111.15%

SurgeSMTP (1,095 servers)

Version Number of Servers Percent
5.3h2-217816.26%
6.1c-114112.88%
5.2a-112010.96%
6.0a5-5726.58%
3.9e-1696.30%
6.0a4-4433.93%
3.8k4-4353.20%
4.0u4-4302.74%
5.0e4-4242.19%
4.2d2-2201.83%
4.3g2-2191.74%
3.8i3-3171.55%
5.3h-1161.46%
3.9h-18151.37%
6.0a3-3141.28%
5.0e3-3131.19%
3.7b8-8121.10%
3.6f5-5121.10%
4.2d4-4121.10%
3.9c-1111.00%
4.3g4-4111.00%
Other21119.27%

ArGoSoft (848 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)20724.41%
1.8 (1.8.9.5)11914.03%
1.8 (1.8.9.3)11012.97%
1.8 (1.8.9.1)849.91%
1.8 (1.8.8.8)586.84%
1.8 (1.8.8.7)536.25%
1.8 (1.8.9.2)344.01%
1.8 (1.8.9.4)252.95%
1.8 (1.8.6.0)151.77%
1.8 (1.8.8.1)141.65%
1.8 (1.8.8.9)131.53%
1.8 (1.8.8.2)91.06%
Other10712.62%

GroupWise (563 servers)

Version Number of Servers Percent
8.0.211720.78%
7.0.310719.01%
6.5.76611.72%
7.0.4396.93%
7.0.2396.93%
6.5.4254.44%
8.0.1244.26%
6.5.6223.91%
7.0.1203.55%
12.0.0183.20%
6.0.4173.02%
6.5.1162.84%
8.0.0101.78%
7.071.24%
8.0.371.24%
6.5.571.24%
Other223.91%

Post.Office (398 servers)

Version Number of Servers Percent
3.5.35714.32%
4.1.0.2389.55%
4.1.2.4287.04%
4.0.1276.78%
4.1.1184.52%
3.9.2.3174.27%
3.5.3J143.52%
3.8.3133.27%
3.9.2123.02%
4.2123.02%
3.1.2102.51%
3.1.2J102.51%
4.1.0.3102.51%
3.8.7.492.26%
4.0.1.192.26%
4.1.0.482.01%
3.6.282.01%
4.2.1.171.76%
4.1.2.371.76%
4.2.161.51%
3.9.1.261.51%
4.1.2.261.51%
3.9.161.51%
3.9.1.351.26%
4.0.0.151.26%
3.9.2.241.01%
4.141.01%
3.5.141.01%
3.9.2.141.01%
Other348.54%

Trend Micro (394 servers)

Version Number of Servers Percent
5.715439.09%
5.510125.63%
5.187017.77%
7.0379.39%
7.1205.08%
Other123.05%

Gordano Messaging Suite (GMS) (358 servers)

Version Number of Servers Percent
Other358100.00%

MagicMail (321 servers)

Version Number of Servers Percent
Other321100.00%

Mirapoint (183 servers)

Version Number of Servers Percent
3.10.10a-GA2111.48%
4.2.3-GA168.74%
4.1.10-GA147.65%
4.1.9-GA105.46%
3.10.5-GA105.46%
3.8.4-GA105.46%
4.1.3-GA94.92%
3.10.8-GA84.37%
3.10.9-GA84.37%
4.3.3-GA84.37%
3.8.3-GA63.28%
4.1.4-GA63.28%
4.2.4-GA52.73%
3.10.7-GA52.73%
4.1.8-GA42.19%
3.8.5-GA42.19%
3.8.6-GA42.19%
3.8.7a31.64%
4.1.5-GA31.64%
4.3.4-GA31.64%
3.10.4-GA31.64%
4.3.5-GA31.64%
3.10.3-GA31.64%
3.7.5a-GA31.64%
4.0.5a21.09%
4.3.1a-FCS21.09%
3.8.2-GA21.09%
Other84.37%

InterScan VirusWall (148 servers)

Version Number of Servers Percent
Other148100.00%

VisNetic (147 servers)

Version Number of Servers Percent
9.3.2.04228.57%
9.1.4.12013.61%
8.5.0.8106.80%
5.5.8.374.76%
5.8.6.674.76%
8.0.3.174.76%
7.6.1.064.08%
8.0.353.40%
6.2.2.042.72%
8.0.3.042.72%
5.3.5.042.72%
7.2.4.132.04%
9.1.4.032.04%
5.0.2.332.04%
5.4.5.432.04%
5.0.2.121.36%
6.0.9.021.36%
8.3.5.021.36%
5.8.6.421.36%
Other117.48%

Interscan (56 servers)

Version Number of Servers Percent
3.55 (build 1016)1323.21%
3.81-Build_10221119.64%
3.55 (build 1029)712.50%
3.8-Build_301347.14%
3.53 (build 2011)47.14%
3.53 (build 1493)35.36%
3.53 (build 2017)35.36%
3.81-Build_108435.36%
3.53 (build 2013)23.57%
3.81-Build_105511.79%
3.5 (build 1294)11.79%
3.51 (build 1337)11.79%
3.55 (build 1020)11.79%
3.8-Build_304511.79%
3.8-Build_108011.79%
Other00.00%

Mercury (52 servers)

Version Number of Servers Percent
1.482853.85%
3.321528.85%
3.01a23.85%
1.4723.85%
3.2111.92%
1.4411.92%
4.x11.92%
3.3011.92%
3.21c11.92%
Other00.00%

NetIQ MailMarshal (44 servers)

Version Number of Servers Percent
6.0.3.83068.18%
5.5.6.749.09%
6.1.3.1536.82%
5.5.6.524.55%
5.5.6.624.55%
5.5.5.612.27%
5.5.4.1712.27%
5.5.4.1612.27%
Other00.00%

WebSTAR V (32 servers)

Version Number of Servers Percent
5.4.11546.88%
5.4.0928.12%
5.3.339.38%
5.3.439.38%
5.3.226.25%
Other00.00%

Neon Mail Server (28 servers)

Version Number of Servers Percent
3.0.7828.57%
3.1.3517.86%
3.1.0414.29%
3.1.4310.71%
3.1.2310.71%
3.0.927.14%
3.1.113.57%
3.1.513.57%
3.0.613.57%
Other00.00%

MessageWall (23 servers)

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

OpenSMTPD (22 servers)

Version Number of Servers Percent
Other22100.00%

OpenVMS (17 servers)

Version Number of Servers Percent
8.3847.06%
7.3423.53%
8.4317.65%
6.115.88%
8.215.88%
Other00.00%

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%

WebSTAR (14 servers)

Version Number of Servers Percent
Other14100.00%

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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