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Mail (MX) Server Survey
March 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 Queried2,216,639   100.0%
Number of Servers that didn't respond353,25815.94%
    Server didn't open socket342,49315.45%
    Server didn't provide banner10,7650.49%
Server provided banner1,863,38184.06%
Server banner identifies software in use1,020,16646.02%

As indicated by the above table, of the 2,216,639 servers queried, only 1,020,166 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
Exim467,13345.79%
Postfix230,88522.63%
Sendmail123,20512.08%
Microsoft114,58611.23%
MailEnable32,4283.18%
MDaemon20,1011.97%
IMail8,5370.84%
Lotus Domino4,4550.44%
WinWebMail3,6040.35%
CommuniGate Pro3,1220.31%
XMail2,1140.21%
Kerio1,9560.19%
Qmail Toaster1,5800.15%
Merak1,4630.14%
SurgeSMTP1,1820.12%
ArGoSoft8840.09%
GroupWise6680.07%
Trend Micro4100.04%
Gordano Messaging Suite (GMS)3750.04%
Post.Office3310.03%
MagicMail3240.03%
Mirapoint2050.02%
VisNetic1610.02%
InterScan VirusWall1330.01%
NetIQ MailMarshal570.01%
Interscan530.01%
Mercury510.00%
WebSTAR V370.00%
Neon Mail Server370.00%
OpenVMS200.00%
MessageWall190.00%
OpenSMTPD170.00%
WebSTAR150.00%
ModusMail120.00%
MAILsweeper60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (467,133 servers)

Version Number of Servers Percent
4.69369,54379.11%
4.7636,7927.88%
4.7219,1264.09%
4.7712,2702.63%
4.677,9841.71%
4.635,3791.15%
Other16,0393.43%

Postfix (230,885 servers)

Version Number of Servers Percent
Other230,885100.00%

Sendmail (123,205 servers)

Version Number of Servers Percent
8.13.830,83525.03%
8.13.120,74616.84%
8.14.316,83813.67%
8.14.510,4278.46%
8.14.410,3718.42%
8.12.11.200603085,2284.24%
8.13.6.200606144,2913.48%
8.14.23,6802.99%
8.11.62,7452.23%
8.12.102,5072.03%
8.13.62,2401.82%
8.14.12,1501.75%
8.12.11.200606141,9871.61%
8.13.71,7181.39%
8.12.111,5271.24%
8.12.81,2351.00%
Other4,6803.80%

Microsoft (114,586 servers)

Version Number of Servers Percent
6.0.3790.467590,09078.62%
6.0.3790.395915,14513.22%
6.0.3790.18304,1243.60%
5.0.2195.73811,3361.17%
Other3,8913.40%

MailEnable (32,428 servers)

Version Number of Servers Percent
1.986--8,85327.30%
4.26--2,5477.85%
5.10--2,0856.43%
1.981--1,7155.29%
1.983--1,0783.32%
0-3.63-7882.43%
5.51--7572.33%
3.62--7292.25%
5.11--6512.01%
4.22--4631.43%
4.23--4051.25%
0-1.87-4041.25%
0-4.26-3941.21%
0-5.51-3861.19%
6.0--3541.09%
0-2.53-3331.03%
Other10,48632.34%

MDaemon (20,101 servers)

Version Number of Servers Percent
11.0.32,57212.80%
12.5.32,39011.89%
11.0.01,2146.04%
12.5.21,1965.95%
10.0.08834.39%
10.1.28744.35%
12.0.38524.24%
10.1.16893.43%
12.0.46293.13%
9.6.15392.68%
9.6.64862.42%
10.1.04572.27%
12.5.03801.89%
12.5.13721.85%
9.6.53431.71%
9.5.23271.63%
9.6.23171.58%
10.0.53171.58%
12.0.13041.51%
9.5.12851.42%
9.5.62751.37%
10.0.22751.37%
12.0.02741.36%
9.6.42611.30%
8.1.32451.22%
10.0.42261.12%
9.0.42261.12%
Other2,89314.39%

IMail (8,537 servers)

Version Number of Servers Percent
8.221,55018.16%
11.51,41316.55%
8.155766.75%
9.235105.97%
11.034715.52%
11.014495.26%
8.053524.12%
11.023063.58%
10.022753.22%
11.02552.99%
9.102452.87%
7.072202.58%
7.151952.28%
9.201852.17%
6.061591.86%
8.001571.84%
10.011271.49%
12.0.0.3481251.46%
9.211041.22%
Other86310.11%

Lotus Domino (4,455 servers)

Version Number of Servers Percent
8.5.359313.31%
8.5.24349.74%
8.5.2FP23317.43%
8.5.12856.40%
7.0.22335.23%
8.5.2FP32054.60%
8.51894.24%
8.5.2FP11563.50%
7.0.31343.01%
8.5.1FP51102.47%
8.0.11082.42%
7.0.1992.22%
8.0.2972.18%
6.5.1912.04%
6.5.4861.93%
7.0751.68%
8.0721.62%
6.5.3681.53%
8.5.1FP3681.53%
7.0.3FP1601.35%
8.5.1FP4571.28%
6.5551.23%
6.5.5521.17%
7.0.2FP2491.10%
8.5.2FP4451.01%
Other70315.78%

WinWebMail (3,604 servers)

Version Number of Servers Percent
3.8.1.379121.95%
3.8.0.156615.70%
3.7.6.145512.62%
3.8.1.13048.44%
3.7.3.13008.32%
3.7.7.32958.19%
3.8.1.52707.49%
3.7.1.11654.58%
3.7.5.11203.33%
3.7.7.1772.14%
3.6.3.1691.91%
3.7.0.3601.66%
3.7.0.5591.64%
3.7.0.7501.39%
Other230.64%

CommuniGate Pro (3,122 servers)

Version Number of Servers Percent
5.1.162227.11%
4.1.81585.06%
5.4.31454.64%
5.4.11324.23%
5.4.21133.62%
5.2.201133.62%
5.3.131113.56%
5.2.16802.56%
4.2.10782.50%
5.4.4742.37%
5.1.12672.15%
5.0.14652.08%
5.4.0621.99%
5.2.3621.99%
5.3.12621.99%
5.3.8621.99%
5.2.19601.92%
5.2.14571.83%
5.3.9471.51%
5.1.13471.51%
5.3.10461.47%
5.3.14451.44%
5.4451.44%
5.2.12441.41%
5.2.8421.35%
5.2.13351.12%
5.1.14351.12%
5.3.15331.06%
5.3.5331.06%
Other94730.33%

XMail (2,114 servers)

Version Number of Servers Percent
1.2250123.70%
1.2743720.67%
1.2540219.02%
1.2626412.49%
1.241959.22%
1.21813.83%
1.23502.37%
1.20401.89%
1.12321.51%
1.17321.51%
Other803.78%

Kerio (1,956 servers)

Version Number of Servers Percent
6.7.328514.57%
6.6.219910.17%
6.7.01769.00%
6.5.21346.85%
6.5.01306.65%
6.7.21155.88%
6.4.11095.57%
6.7.11065.42%
6.3.1884.50%
6.4.0783.99%
6.5.1753.83%
6.6.0703.58%
6.6.1613.12%
6.4.2512.61%
6.3.0311.58%
6.2.0241.23%
6.0.10231.18%
6.1.0211.07%
6.2.2201.02%
6.1.3201.02%
Other1407.16%

Qmail Toaster (1,580 servers)

Version Number of Servers Percent
1.31,49094.30%
1.2603.80%
1.0171.08%
Other130.82%

Merak (1,463 servers)

Version Number of Servers Percent
8.0.359340.53%
8.9.115710.73%
8.5.01117.59%
7.5.2684.65%
7.6.4624.24%
8.3.8614.17%
7.4.5563.83%
9.0.0281.91%
7.4.2231.57%
7.6.1221.50%
8.9.0191.30%
8.3.15191.30%
7.2.0181.23%
6.2.1181.23%
7.0.1171.16%
8.2.4171.16%
Other17411.89%

SurgeSMTP (1,182 servers)

Version Number of Servers Percent
5.3h2-236731.05%
5.2a-114712.44%
3.9e-1837.02%
4.2d4-4806.77%
5.3h-1403.38%
3.8k4-4383.21%
4.0u4-4383.21%
5.0e4-4211.78%
4.2d2-2211.78%
4.3g2-2211.78%
3.8i3-3201.69%
3.6f5-5161.35%
5.0e3-3141.18%
4.3e-1131.10%
4.3g4-4131.10%
3.9c-1131.10%
5.1c2-2131.10%
4.2a3-3131.10%
3.9h-18131.10%
Other19816.75%

ArGoSoft (884 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)20923.64%
1.8 (1.8.9.5)13214.93%
1.8 (1.8.9.3)11012.44%
1.8 (1.8.9.1)788.82%
1.8 (1.8.8.8)657.35%
1.8 (1.8.8.7)475.32%
1.8 (1.8.9.2)374.19%
1.8 (1.8.9.4)222.49%
1.8 (1.8.6.0)212.38%
1.8 (1.8.8.9)131.47%
1.8 (1.8.8.1)131.47%
1.8 (1.8.9.0)111.24%
1.8 (1.8.8.2)111.24%
Other11513.01%

GroupWise (668 servers)

Version Number of Servers Percent
8.0.214421.56%
7.0.313720.51%
6.5.77511.23%
7.0.2477.04%
7.0.4426.29%
8.0.1426.29%
7.0.1284.19%
6.5.4274.04%
6.5.6223.29%
6.5.1192.84%
8.0.0172.54%
6.0.4172.54%
6.5.5121.80%
7.071.05%
Other324.79%

Trend Micro (410 servers)

Version Number of Servers Percent
5.717241.95%
5.510425.37%
5.186215.12%
7.04410.73%
7.1174.15%
Other112.68%

Gordano Messaging Suite (GMS) (375 servers)

Version Number of Servers Percent
Other375100.00%

Post.Office (331 servers)

Version Number of Servers Percent
3.5.35516.62%
4.1.0.23510.57%
4.0.1278.16%
3.5.3J175.14%
4.1.2.4154.53%
4.1.1123.63%
3.9.2.3113.32%
3.1.2J92.72%
4.1.0.492.72%
3.9.292.72%
3.1.282.42%
4.0.1.182.42%
4.282.42%
3.8.382.42%
4.1.0.382.42%
4.1.2.372.11%
3.8.7.472.11%
3.9.2.161.81%
3.6.261.81%
4.2.161.81%
4.0.0.251.51%
3.9.2.241.21%
4.141.21%
3.9.1.341.21%
4.1.2.241.21%
4.0.0.141.21%
3.5.241.21%
3.9.141.21%
Other278.16%

MagicMail (324 servers)

Version Number of Servers Percent
Other324100.00%

Mirapoint (205 servers)

Version Number of Servers Percent
4.2.3-GA209.76%
3.10.10a-GA199.27%
3.8.4-GA178.29%
3.10.9-GA157.32%
4.1.10-GA136.34%
3.10.5-GA136.34%
3.8.3-GA115.37%
4.1.9-GA94.39%
3.10.8-GA83.90%
4.3.3-GA73.41%
4.1.8-GA73.41%
4.1.3-GA62.93%
3.10.7-GA62.93%
4.1.4-GA62.93%
3.8.5-GA52.44%
3.8.6-GA41.95%
3.10.4-GA41.95%
3.8.2-GA41.95%
3.8.7a41.95%
4.2.4-GA41.95%
3.10.3-GA41.95%
4.1.5-GA31.46%
Other167.80%

VisNetic (161 servers)

Version Number of Servers Percent
9.3.2.04829.81%
9.1.4.12515.53%
8.5.0.8106.21%
5.8.6.695.59%
8.0.3.163.73%
5.5.8.363.73%
5.0.2.363.73%
7.6.1.063.73%
8.0.3.053.11%
7.2.4.153.11%
8.0.353.11%
5.3.5.042.48%
9.1.4.042.48%
8.3.5.031.86%
5.0.2.121.24%
6.2.2.021.24%
8.3.0.121.24%
5.4.5.421.24%
Other116.83%

InterScan VirusWall (133 servers)

Version Number of Servers Percent
Other133100.00%

NetIQ MailMarshal (57 servers)

Version Number of Servers Percent
6.0.3.84375.44%
5.5.6.758.77%
6.1.3.1535.26%
5.5.5.911.75%
5.5.4.1711.75%
5.5.6.611.75%
5.5.6.511.75%
5.5.4.1611.75%
5.5.5.611.75%
Other00.00%

Interscan (53 servers)

Version Number of Servers Percent
3.55 (build 1016)1018.87%
3.81-Build_1022815.09%
3.55 (build 1029)713.21%
3.8-Build_301347.55%
3.81-Build_108447.55%
3.53 (build 1493)35.66%
3.55 (build 1020)35.66%
3.52 (build 1375)35.66%
3.53 (build 2017)23.77%
3.53 (build 2011)23.77%
3.53 (build 2013)23.77%
3.5 (build 1294)11.89%
3.51 (build 1337)11.89%
3.6-Build_124611.89%
3.8-Build_304511.89%
3.8-Build_108011.89%
Other00.00%

Mercury (51 servers)

Version Number of Servers Percent
1.482549.02%
3.321427.45%
3.01a23.92%
1.4723.92%
3.21c23.92%
3.3023.92%
3.2111.96%
1.4411.96%
3.3111.96%
4.x11.96%
Other00.00%

WebSTAR V (37 servers)

Version Number of Servers Percent
5.4.11745.95%
5.4.0924.32%
5.3.4513.51%
5.3.3410.81%
5.3.225.41%
Other00.00%

Neon Mail Server (37 servers)

Version Number of Servers Percent
3.0.71027.03%
3.1.3718.92%
3.0.9513.51%
3.1.0513.51%
3.1.4410.81%
3.1.225.41%
3.1.112.70%
3.0.812.70%
3.1.512.70%
3.0.612.70%
Other00.00%

OpenVMS (20 servers)

Version Number of Servers Percent
8.3735.00%
7.3630.00%
8.4420.00%
6.115.00%
7.215.00%
8.215.00%
Other00.00%

MessageWall (19 servers)

Version Number of Servers Percent
1.0.81894.74%
1.0.615.26%
Other00.00%

OpenSMTPD (17 servers)

Version Number of Servers Percent
Other17100.00%

WebSTAR (15 servers)

Version Number of Servers Percent
Other15100.00%

ModusMail (12 servers)

Version Number of Servers Percent
4.35.480.0325.00%
4.35.477.0325.00%
4.1.361.2118.33%
3.2.315.018.33%
4.0.340.318.33%
4.3.459.018.33%
4.35.477.818.33%
3.1.302.018.33%
Other00.00%

MAILsweeper (6 servers)

Version Number of Servers Percent
4.3.17.0233.33%
4.3.19.0233.33%
4.3.1.0116.67%
4.3.20.0116.67%
Other00.00%




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