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Mail (MX) Server Survey
December 1st, 2007

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 Queried1,782,613   100.0%
Number of Servers that didn't respond276,91315.53%
    Server didn't open socket265,59414.90%
    Server didn't provide banner11,3190.63%
Server provided banner1,505,70084.47%
Server banner identifies software in use906,81650.87%

As indicated by the above table, of the 1,782,613 servers queried, only 906,816 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
Sendmail254,25628.04%
Microsoft199,96722.05%
Exim188,46920.78%
Postfix140,05515.44%
IMail27,7223.06%
MDaemon22,3082.46%
MailEnable21,8372.41%
Lotus Domino7,3160.81%
Merak7,0810.78%
Kerio5,1260.57%
CommuniGate Pro5,0040.55%
WinWebMail4,4510.49%
Trend Micro3,8420.42%
GroupWise3,2750.36%
ArGoSoft2,8270.31%
XMail2,6110.29%
SurgeSMTP1,8390.20%
Qmail Toaster1,5600.17%
Gordano Messaging Suite (GMS)1,1470.13%
Post.Office1,0330.11%
InterScan VirusWall8500.09%
NetIQ MailMarshal8420.09%
Interscan6950.08%
VisNetic5620.06%
Mirapoint5590.06%
MagicMail3370.04%
ModusMail2500.03%
WebSTAR V2440.03%
Mercury2150.02%
Neon Mail Server1780.02%
MAILsweeper1250.01%
MessageWall1030.01%
WebSTAR970.01%
OpenVMS330.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (254,256 servers)

Version Number of Servers Percent
8.12.11.2006061442,20616.60%
8.12.11.2006030832,10712.63%
8.13.126,59810.46%
8.13.624,2529.54%
8.11.623,6849.32%
8.12.1016,4216.46%
8.13.815,3376.03%
8.13.6.2006061410,3754.08%
8.14.110,0053.94%
8.12.119,9513.91%
8.13.48,2993.26%
8.12.87,1042.79%
8.13.75,9912.36%
8.9.34,1681.64%
8.10.24,1431.63%
Other13,6155.35%

Microsoft (199,967 servers)

Version Number of Servers Percent
6.0.3790.3959102,28251.15%
6.0.3790.183059,53129.77%
5.0.2195.671322,95311.48%
6.0.3790.2119,4994.75%
Other5,7022.85%

Exim (188,469 servers)

Version Number of Servers Percent
4.68105,53456.00%
4.6338,17520.26%
4.669,1234.84%
4.507,8634.17%
4.607,3923.92%
4.674,3412.30%
4.623,8852.06%
4.522,7601.46%
Other9,3964.99%

Postfix (140,055 servers)

Version Number of Servers Percent
Other140,055100.00%

IMail (27,722 servers)

Version Number of Servers Percent
8.225,53119.95%
8.154,87117.57%
8.052,5959.36%
9.212,1047.59%
9.101,7726.39%
9.221,4355.18%
9.201,1964.31%
7.071,1514.15%
7.151,1033.98%
6.068443.04%
8.006092.20%
8.215441.96%
8.203821.38%
8.103451.24%
8.043171.14%
8.123091.11%
Other2,6149.43%

MDaemon (22,308 servers)

Version Number of Servers Percent
9.6.24,94522.17%
9.5.61,4296.41%
9.6.31,3976.26%
9.6.11,2435.57%
8.1.31,1855.31%
9.0.41,1104.98%
6.8.56973.12%
9.5.16853.07%
9.5.26773.03%
7.2.36382.86%
7.2.05132.30%
9.0.15092.28%
9.5.54361.95%
8.1.44271.91%
9.5.44211.89%
9.0.04191.88%
8.0.23991.79%
9.6.03931.76%
8.1.13451.55%
9.5.33231.45%
7.1.22921.31%
8.1.52801.26%
8.0.32791.25%
9.0.72551.14%
7.1.02511.13%
7.2.22451.10%
7.2.12261.01%
9.0.62261.01%
Other2,0639.25%

MailEnable (21,837 servers)

Version Number of Servers Percent
1.981--5,07423.24%
1.96--1,9248.81%
1.95--1,5907.28%
1.983--1,4416.60%
1.9--1,4166.48%
1.8--1,3005.95%
0-2.37-1,1285.17%
0-1.85-1,0294.71%
0-2.38-7673.51%
0-2.36-5332.44%
0--2.374822.21%
0--2.384442.03%
0-1.841-2471.13%
Other4,46220.43%

Lotus Domino (7,316 servers)

Version Number of Servers Percent
7.0.294412.90%
7.0.2FP25627.68%
6.5.45287.22%
7.0.14906.70%
6.5.14586.26%
6.5.33945.39%
6.5.53524.81%
7.03164.32%
7.0.2FP13124.26%
6.52713.70%
8.02333.18%
5.0.111982.71%
6.5.21912.61%
5.0.121391.90%
6.5.5FP21211.65%
5.0.81121.53%
5.0.101111.52%
7.0.1FP11101.50%
5.0.13a1091.49%
6.5.4FP2901.23%
6.5.6881.20%
6.0.2CF1871.19%
6.0.3801.09%
6.5.4FP3761.04%
Other94412.90%

Merak (7,081 servers)

Version Number of Servers Percent
8.0.32,02728.63%
8.9.11,17816.64%
8.5.05748.11%
9.0.03294.65%
7.4.53174.48%
7.5.23054.31%
8.3.83004.24%
7.6.42823.98%
7.4.21672.36%
7.2.01221.72%
8.2.41171.65%
8.9.01091.54%
6.2.1921.30%
7.4.0841.19%
8.3.0791.12%
7.6.1731.03%
Other92613.08%

Kerio (5,126 servers)

Version Number of Servers Percent
6.4.11,75234.18%
6.3.193318.20%
6.4.072114.07%
6.3.03045.93%
6.2.21332.59%
6.1.31182.30%
6.1.21172.28%
6.2.01162.26%
6.1.01122.18%
6.1.4981.91%
6.0.10961.87%
6.0.3761.48%
6.1.1601.17%
Other4909.56%

CommuniGate Pro (5,004 servers)

Version Number of Servers Percent
4.1.856911.37%
5.1.124188.35%
4.2.103506.99%
5.1.102134.26%
5.1.112084.16%
5.0.91983.96%
5.0.131883.76%
5.1.131803.60%
5.1.91593.18%
5.1.71452.90%
5.1.81412.82%
4.3.121322.64%
4.2.81102.20%
4.2.7981.96%
5.0.11881.76%
5.0.8881.76%
4.2861.72%
5.1.5841.68%
4.2.9821.64%
5.1.3731.46%
4.0.6711.42%
5.1.6671.34%
5.1.2591.18%
3.5.9581.16%
4.3.8571.14%
Other1,08221.62%

WinWebMail (4,451 servers)

Version Number of Servers Percent
3.7.3.11,68137.77%
3.7.1.190720.38%
3.6.3.157412.90%
3.7.0.54349.75%
3.7.0.72916.54%
3.7.0.32645.93%
3.7.5.12505.62%
Other501.12%

Trend Micro (3,842 servers)

Version Number of Servers Percent
5.71,73345.11%
5.51,54540.21%
5.1844711.63%
7.0591.54%
Other581.51%

GroupWise (3,275 servers)

Version Number of Servers Percent
7.0.297829.86%
7.0.151815.82%
6.5.738811.85%
6.5.42708.24%
6.5.61986.05%
6.0.41805.50%
7.01364.15%
6.5.51364.15%
6.5.11113.39%
6.0.2531.62%
6.5.3521.59%
6.5.2501.53%
6.0.3481.47%
5.5.5371.13%
Other1203.66%

ArGoSoft (2,827 servers)

Version Number of Servers Percent
1.8 (1.8.9.1)59921.19%
1.8 (1.8.8.8)41214.57%
1.8 (1.8.9.2)31911.28%
1.8 (1.8.8.7)31311.07%
1.8 (1.8.8.9)1535.41%
1.8 (1.8.9.3)1324.67%
1.8 (1.8.9.0)913.22%
1.8 (1.8.8.1)672.37%
1.8 (1.8.8.2)612.16%
1.8 (1.8.6.0)572.02%
1.8 (1.8.8.3)451.59%
1.8 (1.8.5.9)371.31%
1.8 (1.8.7.5)361.27%
1.8 (1.8.8.4)341.20%
Other47116.66%

XMail (2,611 servers)

Version Number of Servers Percent
1.2289934.43%
1.2460723.25%
1.2136213.86%
1.201535.86%
1.171495.71%
1.231405.36%
1.12863.29%
1.18441.69%
1.16411.57%
Other1304.98%

SurgeSMTP (1,839 servers)

Version Number of Servers Percent
3.8k4-450627.51%
3.8i3-320611.20%
3.7b8-819010.33%
3.8o-11387.50%
3.8f3-31156.25%
3.6f5-5945.11%
3.8f2-2854.62%
3.5b3-3633.43%
3.8k2-2613.32%
3.0c2-2552.99%
3.7b6-6412.23%
3.8m-1321.74%
3.8i-1271.47%
3.8k-1231.25%
2.1c7-7211.14%
2.0g2-1191.03%
Other1638.86%

Qmail Toaster (1,560 servers)

Version Number of Servers Percent
1.31,08169.29%
1.239725.45%
1.0825.26%
Other00.00%

Gordano Messaging Suite (GMS) (1,147 servers)

Version Number of Servers Percent
Other1,147100.00%

Post.Office (1,033 servers)

Version Number of Servers Percent
3.5.328827.88%
4.0.1949.10%
3.5.3J827.94%
3.8.3605.81%
3.6.3535.13%
3.6.2424.07%
3.9.1363.48%
3.1.2J343.29%
3.9.2.3313.00%
3.9.2272.61%
3.9.0262.52%
3.1.2262.52%
3.8.7.4252.42%
3.8.4232.23%
3.5.2212.03%
4.0.0.2171.65%
3.6.0161.55%
3.9.1.3141.36%
3.8.2141.36%
4.0.0.1131.26%
3.9.2.1131.26%
Other787.55%

InterScan VirusWall (850 servers)

Version Number of Servers Percent
Other850100.00%

NetIQ MailMarshal (842 servers)

Version Number of Servers Percent
6.0.3.863775.65%
5.5.6.7495.82%
6.1.3.15404.75%
5.5.6.6202.38%
5.5.6.5202.38%
5.5.4.16192.26%
5.5.5.9151.78%
5.5.5.6111.31%
5.5.4.1791.07%
Other222.61%

Interscan (695 servers)

Version Number of Servers Percent
3.55 (build 1016)13819.86%
3.81-Build_10228412.09%
3.8-Build_30137510.79%
3.53 (build 2017)598.49%
3.55 (build 1029)568.06%
3.53 (build 2011)557.91%
3.81-Build_1084466.62%
3.53 (build 2013)273.88%
3.53 (build 1493)253.60%
3.52 (build 1375)233.31%
3.55 (build 1020)192.73%
3.8-Build_1080121.73%
3.81-Build_105581.15%
3.81-Build_102181.15%
3.8-Build_306571.01%
Other537.63%

VisNetic (562 servers)

Version Number of Servers Percent
8.5.0.812422.06%
7.2.4.1427.47%
5.8.6.6356.23%
8.0.3.0335.87%
8.0.3.1335.87%
8.3.5.0325.69%
6.2.2.0315.52%
5.0.2.3295.16%
5.5.8.3254.45%
7.6.1.0244.27%
8.3.6173.02%
5.3.5.0173.02%
8.0.3132.31%
8.9.2.0132.31%
8.5.0.5132.31%
7.5.3.0111.96%
5.4.5.4111.96%
8.3.0.171.25%
5.8.6.461.07%
7.2.4.061.07%
Other407.12%

Mirapoint (559 servers)

Version Number of Servers Percent
3.8.3-GA10518.78%
3.8.4-GA10318.43%
3.8.5-GA9216.46%
3.7.5a-GA6511.63%
3.8.2-GA529.30%
3.7.4b-GA285.01%
3.7.3a-GA285.01%
3.7.5-GA142.50%
3.5.8-GR91.61%
1.1.091.61%
3.7.1-GA81.43%
3.7.2-GA61.07%
3.7.3-GA61.07%
Other346.08%

MagicMail (337 servers)

Version Number of Servers Percent
Other337100.00%

ModusMail (250 servers)

Version Number of Servers Percent
4.35.480.08534.00%
3.2.315.03112.40%
4.2.425.222610.40%
4.1.361.212610.40%
4.35.477.0218.40%
3.0.273.0114.40%
3.1.302.093.60%
4.3.459.083.20%
4.35.480.1172.80%
4.2.420.041.60%
4.1.361.031.20%
4.0.340.031.20%
4.2.425.431.20%
Other135.20%

WebSTAR V (244 servers)

Version Number of Servers Percent
5.4.07731.56%
5.4.16125.00%
5.3.45522.54%
5.3.3229.02%
5.3.2197.79%
5.3.072.87%
Other31.23%

Mercury (215 servers)

Version Number of Servers Percent
1.4810046.51%
3.326831.63%
3.21c188.37%
3.3183.72%
1.4473.26%
1.4762.79%
Other83.72%

Neon Mail Server (178 servers)

Version Number of Servers Percent
3.0.95229.21%
3.0.75128.65%
3.1.03117.42%
3.1.22514.04%
3.0.684.49%
3.0.863.37%
3.0.421.12%
3.0.521.12%
Other10.56%

MAILsweeper (125 servers)

Version Number of Servers Percent
4.3.20.02620.80%
4.3.17.02016.00%
4.3.14.01915.20%
4.3.19.01814.40%
4.3.12.01310.40%
4.2.10.086.40%
4.3.6.064.80%
4.3.10.064.80%
4.3.1.043.20%
4.2.5.032.40%
Other21.60%

MessageWall (103 servers)

Version Number of Servers Percent
1.0.88380.58%
1.0.111514.56%
1.0.632.91%
1.1.021.94%
Other00.00%

WebSTAR (97 servers)

Version Number of Servers Percent
Other97100.00%

OpenVMS (33 servers)

Version Number of Servers Percent
7.31133.33%
8.21030.30%
8.3927.27%
7.226.06%
6.113.03%
Other00.00%




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