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Mail (MX) Server Survey
January 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 Queried1,680,006   100.0%
Number of Servers that didn't respond238,53814.20%
    Server didn't open socket230,16113.70%
    Server didn't provide banner8,3770.50%
Server provided banner1,441,46885.80%
Server banner identifies software in use906,10053.93%

As indicated by the above table, of the 1,680,006 servers queried, only 906,100 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
Sendmail293,11532.35%
Microsoft190,72721.05%
Exim164,74818.18%
Postfix118,89713.12%
IMail38,4474.24%
MDaemon21,4502.37%
MailEnable19,1582.11%
Merak8,5700.95%
Lotus Domino8,5620.94%
CommuniGate Pro5,5290.61%
Trend Micro4,8420.53%
GroupWise4,4830.49%
WinWebMail4,1240.46%
Kerio4,0740.45%
ArGoSoft3,1460.35%
XMail2,4170.27%
SurgeSMTP1,7100.19%
Gordano Messaging Suite (GMS)1,6790.19%
NetIQ MailMarshal1,5520.17%
Post.Office1,3040.14%
Interscan1,2890.14%
InterScan VirusWall1,2760.14%
Qmail Toaster1,1170.12%
ModusMail8890.10%
VisNetic7220.08%
Mirapoint5190.06%
Mercury3590.04%
WebSTAR V3370.04%
MAILsweeper3350.04%
MagicMail2020.02%
WebSTAR1620.02%
Neon Mail Server1620.02%
MessageWall1610.02%
OpenVMS360.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (293,115 servers)

Version Number of Servers Percent
8.12.11.2006061450,89617.36%
8.11.642,24214.41%
8.12.11.2006030830,79710.51%
8.13.628,4659.71%
8.12.1023,5878.05%
8.13.120,8057.10%
8.12.1114,2514.86%
8.13.411,3313.87%
8.12.810,9113.72%
8.13.810,7463.67%
8.13.6.200606149,3163.18%
8.10.27,3782.52%
8.9.36,9122.36%
8.13.76,5122.22%
8.13.33,2441.11%
Other15,7225.36%

Microsoft (190,727 servers)

Version Number of Servers Percent
6.0.3790.1830123,40364.70%
5.0.2195.671337,25319.53%
6.0.3790.21119,25410.10%
6.0.3790.02,9231.53%
5.5.2653.132,9161.53%
Other4,9782.61%

Exim (164,748 servers)

Version Number of Servers Percent
4.52119,44772.50%
4.5010,8286.57%
4.607,2824.42%
4.637,2434.40%
4.624,0232.44%
4.442,9581.80%
3.361,8691.13%
Other11,0986.74%

Postfix (118,897 servers)

Version Number of Servers Percent
Other118,897100.00%

IMail (38,447 servers)

Version Number of Servers Percent
8.158,64922.50%
8.226,00415.62%
8.054,81712.53%
9.103,88810.11%
6.062,0475.32%
7.151,7004.42%
8.211,6814.37%
7.071,5614.06%
9.048992.34%
8.207421.93%
8.006761.76%
8.105761.50%
8.124801.25%
8.144621.20%
8.024311.12%
8.133911.02%
Other3,4438.96%

MDaemon (21,450 servers)

Version Number of Servers Percent
9.5.33,67817.15%
8.1.31,7718.26%
9.0.41,3776.42%
6.8.51,1235.24%
7.2.38804.10%
9.0.68153.80%
7.2.07903.68%
8.1.47563.52%
9.0.17533.51%
9.5.26603.08%
9.0.76473.02%
9.0.06362.97%
8.0.25772.69%
9.5.15732.67%
8.1.14912.29%
8.0.34672.18%
8.1.54542.12%
9.0.54472.08%
7.1.24151.93%
7.2.23681.72%
7.1.03591.67%
6.8.43391.58%
7.2.13251.52%
8.0.13241.51%
7.0.13041.42%
Other2,1219.89%

MailEnable (19,158 servers)

Version Number of Servers Percent
1.96--2,61813.67%
1.8--2,43512.71%
1.9--2,38912.47%
1.95--1,8559.68%
0-1.75-7203.76%
0-1.54-6253.26%
0-1.6-5813.03%
0-2.32-5712.98%
0-1.79-4772.49%
1.73--3721.94%
0-2.11-3401.77%
0-2.2-3071.60%
0--2.322841.48%
1.91--2511.31%
0-1.71-2511.31%
1.71--2321.21%
0-1.82-2221.16%
0-1.72-2181.14%
0--2.22181.14%
0-2.35-2101.10%
1.92--2051.07%
Other3,77719.72%

Merak (8,570 servers)

Version Number of Servers Percent
8.5.01,95622.82%
8.0.31,86221.73%
8.3.85976.97%
8.9.05766.72%
7.4.54465.20%
7.6.43564.15%
7.5.23474.05%
8.2.42202.57%
7.4.22162.52%
7.2.01922.24%
6.2.11451.69%
8.3.01231.44%
7.4.01071.25%
7.6.1991.16%
Other1,32815.50%

Lotus Domino (8,562 servers)

Version Number of Servers Percent
6.5.48309.69%
6.5.17779.07%
7.0.17698.98%
6.5.35956.95%
6.5.55105.96%
7.0.24975.80%
7.04955.78%
6.53934.59%
5.0.113514.10%
6.5.23393.96%
5.0.122462.87%
7.0.1FP12372.77%
5.0.82072.42%
5.0.101792.09%
5.0.13a1712.00%
6.5.4FP21681.96%
6.0.2CF11471.72%
6.0.31371.60%
6.5.5FP11281.49%
6.5.4FP11251.46%
6.01221.42%
6.5.4FP31221.42%
5.0.9931.09%
5.0.5911.06%
6.0.1881.03%
6.5.3FP1861.00%
Other6597.70%

CommuniGate Pro (5,529 servers)

Version Number of Servers Percent
4.1.881514.74%
4.2.1056910.29%
5.0.94478.08%
5.0.81833.31%
5.1.11823.29%
4.2.41713.09%
5.1.21663.00%
5.0.111642.97%
4.2.81622.93%
4.21512.73%
5.1.31462.64%
4.2.71262.28%
4.0.61262.28%
4.3.81262.28%
4.2.91262.28%
4.3.61172.12%
5.0.101011.83%
4.0.1961.74%
5.1951.72%
3.5.9941.70%
5.0.6851.54%
5.0.12711.28%
4.3.4571.03%
5.0.1561.01%
Other1,09719.84%

Trend Micro (4,842 servers)

Version Number of Servers Percent
5.52,73256.42%
5.71,55032.01%
5.1848710.06%
5.15511.05%
Other220.45%

GroupWise (4,483 servers)

Version Number of Servers Percent
7.0.11,13325.27%
6.5.466114.74%
7.03467.72%
6.0.43317.38%
6.5.53237.20%
6.5.62976.63%
6.5.12575.73%
6.5.72505.58%
6.5.21503.35%
6.5.31483.30%
6.0.21152.57%
6.0.31072.39%
5.5.5912.03%
6.5.0841.87%
6.0.1731.63%
Other1172.61%

WinWebMail (4,124 servers)

Version Number of Servers Percent
3.7.1.11,30831.72%
3.6.3.195723.21%
3.7.0.559314.38%
3.7.0.750812.32%
3.7.0.34029.75%
3.7.3.13027.32%
Other541.31%

Kerio (4,074 servers)

Version Number of Servers Percent
6.3.096323.64%
6.2.254113.28%
6.2.03167.76%
6.1.32686.58%
6.1.22546.23%
6.1.42496.11%
6.1.02034.98%
6.0.101583.88%
6.1.11283.14%
6.2.11192.92%
6.0.31062.60%
6.0.8771.89%
5.7.10651.60%
6.0.9601.47%
6.2.3581.42%
6.0.6551.35%
6.0.7511.25%
Other4039.89%

ArGoSoft (3,146 servers)

Version Number of Servers Percent
1.8 (1.8.8.8)94730.10%
1.8 (1.8.8.7)70322.35%
1.8 (1.8.8.1)1304.13%
1.8 (1.8.6.0)1083.43%
1.8 (1.8.8.2)852.70%
1.8 (1.8.8.3)812.57%
1.8 (1.8.8.9 802.54%
1.8 (1.8.8.5)772.45%
1.8 (1.8.8.4)712.26%
1.8 (1.8.7.5)621.97%
1.8 (1.8.5.9)571.81%
1.8 (1.8.6.6)471.49%
1.8 (1.8.8.6)451.43%
1.8 (1.8.7.6)411.30%
1.8 (1.8.7.3)351.11%
Other57718.34%

XMail (2,417 servers)

Version Number of Servers Percent
1.221,03742.90%
1.2150120.73%
1.202399.89%
1.172018.32%
1.23903.72%
1.12753.10%
1.18722.98%
1.16431.78%
1.10361.49%
1.15301.24%
1.11261.08%
Other672.77%

SurgeSMTP (1,710 servers)

Version Number of Servers Percent
3.7b8-853831.46%
3.8f2-228816.84%
3.6f5-517810.41%
3.5b3-3935.44%
3.8b-1915.32%
3.0c2-2885.15%
3.7b6-6623.63%
3.8g-7573.33%
2.1c7-7311.81%
3.6f3-3251.46%
2.0g2-1251.46%
1.8g3201.17%
1.6e2181.05%
Other19611.46%

Gordano Messaging Suite (GMS) (1,679 servers)

Version Number of Servers Percent
Other1,679100.00%

NetIQ MailMarshal (1,552 servers)

Version Number of Servers Percent
6.0.3.81,09270.36%
5.5.6.71499.60%
6.1.3.15764.90%
5.5.4.16462.96%
5.5.5.9412.64%
5.5.6.6322.06%
5.5.6.5312.00%
5.5.5.6211.35%
5.5.4.17171.10%
Other473.03%

Post.Office (1,304 servers)

Version Number of Servers Percent
3.5.344934.43%
3.5.3J13510.35%
3.8.3796.06%
3.6.3685.21%
3.6.2523.99%
3.1.2J473.60%
3.1.2413.14%
3.9.1413.14%
4.0.1403.07%
3.8.4332.53%
3.5.2282.15%
3.9.2282.15%
3.9.0272.07%
3.6.0251.92%
3.8.7.4211.61%
4.0.0.2201.53%
4.0.0.1161.23%
3.9.2.3141.07%
3.9.1.3141.07%
Other1269.66%

Interscan (1,289 servers)

Version Number of Servers Percent
3.55 (build 1016)30923.97%
3.81-Build_102214911.56%
3.8-Build_30131219.39%
3.55 (build 1029)1189.15%
3.53 (build 2011)1138.77%
3.53 (build 2017)1027.91%
3.53 (build 2013)695.35%
3.55 (build 1020)503.88%
3.52 (build 1375)433.34%
3.53 (build 1493)342.64%
3.8-Build_1080231.78%
3.81-Build_1084181.40%
3.8-Build_3065131.01%
Other1279.85%

InterScan VirusWall (1,276 servers)

Version Number of Servers Percent
Other1,276100.00%

Qmail Toaster (1,117 servers)

Version Number of Servers Percent
1.257151.12%
1.341637.24%
1.012911.55%
Other10.09%

ModusMail (889 servers)

Version Number of Servers Percent
4.35.480.060968.50%
3.2.315.0333.71%
4.1.361.21293.26%
4.2.425.22273.04%
3.1.302.0262.92%
4.2.425.16242.70%
4.35.477.0242.70%
3.1.297.0192.14%
4.3.459.0161.80%
4.35.480.11151.69%
4.1.361.0121.35%
4.2.425.4101.12%
Other455.06%

VisNetic (722 servers)

Version Number of Servers Percent
8.5.0.89212.74%
7.2.4.1638.73%
8.0.3.0547.48%
8.3.5.0537.34%
5.8.6.6486.65%
5.0.2.3456.23%
6.2.2.0425.82%
7.6.1.0405.54%
5.5.8.3354.85%
8.5.0.5344.71%
8.0.3.1344.71%
8.3.6294.02%
7.5.3.0223.05%
5.4.5.4182.49%
8.0.3182.49%
5.3.5.0162.22%
8.3.0.1131.80%
5.8.6.4101.39%
7.2.4.081.11%
Other486.65%

Mirapoint (519 servers)

Version Number of Servers Percent
3.7.5a-GA9718.69%
3.8.2-GA8516.38%
3.7.3a-GA6211.95%
3.7.4b-GA489.25%
3.7.5-GA366.94%
3.7.2-GA254.82%
3.7.1-GA234.43%
3.5.8-GR203.85%
3.8.1-FCS122.31%
1.1.0122.31%
3.8.0-FCS101.93%
3.7.0-GA101.93%
3.7.3-GA91.73%
3.5.9-GR81.54%
3.6.6-GR71.35%
3.6.5-GR71.35%
3.6.4-CR61.16%
Other428.09%

Mercury (359 servers)

Version Number of Servers Percent
1.4815442.90%
3.3212534.82%
3.21c308.36%
3.31195.29%
1.44133.62%
1.4782.23%
3.01a51.39%
Other51.39%

WebSTAR V (337 servers)

Version Number of Servers Percent
5.4.19728.78%
5.4.09628.49%
5.3.47622.55%
5.3.3308.90%
5.3.2205.93%
5.3.0102.97%
5.3.151.48%
Other30.89%

MAILsweeper (335 servers)

Version Number of Servers Percent
4.3.17.05516.42%
4.3.12.05516.42%
4.3.19.05115.22%
4.3.14.04914.63%
4.3.20.04312.84%
4.3.1.0185.37%
4.2.10.0185.37%
4.2.1.0113.28%
4.2.5.0113.28%
4.3.10.0113.28%
4.3.6.092.69%
Other41.19%

MagicMail (202 servers)

Version Number of Servers Percent
Other202100.00%

WebSTAR (162 servers)

Version Number of Servers Percent
Other162100.00%

Neon Mail Server (162 servers)

Version Number of Servers Percent
3.0.77043.21%
3.0.96942.59%
3.0.8106.17%
3.0.695.56%
3.0.421.23%
Other21.23%

MessageWall (161 servers)

Version Number of Servers Percent
1.0.812879.50%
1.0.111710.56%
1.1.2374.35%
1.0.642.48%
1.1.031.86%
Other21.24%

OpenVMS (36 servers)

Version Number of Servers Percent
7.31233.33%
8.21130.56%
7.2822.22%
8.338.33%
6.125.56%
Other00.00%




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