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Mail (MX) Server Survey
September 1st, 2010

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 Queried2,136,152   100.0%
Number of Servers that didn't respond349,95516.38%
    Server didn't open socket336,39615.75%
    Server didn't provide banner13,5590.63%
Server provided banner1,786,19783.62%
Server banner identifies software in use978,78245.82%

As indicated by the above table, of the 2,136,152 servers queried, only 978,782 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
Exim345,87235.34%
Postfix210,56621.51%
Microsoft169,29117.30%
Sendmail153,14115.65%
MailEnable30,8873.16%
MDaemon22,6682.32%
IMail12,8061.31%
Lotus Domino5,2910.54%
WinWebMail4,9660.51%
Kerio4,3890.45%
CommuniGate Pro3,8320.39%
XMail2,6080.27%
Merak2,5300.26%
Qmail Toaster1,7700.18%
ArGoSoft1,4160.14%
SurgeSMTP1,3600.14%
GroupWise1,3080.13%
Trend Micro8990.09%
Gordano Messaging Suite (GMS)5580.06%
Post.Office5470.06%
MagicMail4610.05%
Mirapoint3890.04%
InterScan VirusWall2890.03%
VisNetic2890.03%
NetIQ MailMarshal1500.02%
Interscan1200.01%
Mercury880.01%
WebSTAR V760.01%
Neon Mail Server710.01%
MessageWall320.00%
ModusMail320.00%
WebSTAR290.00%
OpenVMS230.00%
MAILsweeper220.00%
OpenSMTPD60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (345,872 servers)

Version Number of Servers Percent
4.69295,12985.33%
4.6714,2784.13%
4.6312,4103.59%
4.716,2981.82%
4.723,8381.11%
Other13,9194.02%

Postfix (210,566 servers)

Version Number of Servers Percent
Other210,566100.00%

Microsoft (169,291 servers)

Version Number of Servers Percent
6.0.3790.4675101,38459.89%
6.0.3790.395949,06628.98%
6.0.3790.183010,3236.10%
5.0.2195.67132,5961.53%
5.0.2195.73812,5601.51%
Other3,3621.99%

Sendmail (153,141 servers)

Version Number of Servers Percent
8.13.129,28619.12%
8.13.827,43417.91%
8.14.315,1149.87%
8.14.414,3589.38%
8.12.11.2006030810,9697.16%
8.12.11.200606149,5846.26%
8.13.6.200606145,9283.87%
8.12.105,1173.34%
8.14.24,9193.21%
8.11.64,7793.12%
8.13.64,1492.71%
8.14.13,6912.41%
8.12.113,3282.17%
8.13.42,7371.79%
8.13.72,7091.77%
8.12.82,2851.49%
Other6,7544.41%

MailEnable (30,887 servers)

Version Number of Servers Percent
1.986--9,98832.34%
1.981--3,0459.86%
1.983--1,9756.39%
3.62--1,2564.07%
4.23--9232.99%
0-3.63-9072.94%
4.22--7842.54%
1.96--5831.89%
1.95--5301.72%
0-4.23-5231.69%
0-2.53-4521.46%
0-1.87-4471.45%
4.23--4.234361.41%
1.9--4331.40%
0-4.22-4241.37%
--3.633781.22%
4.17--3771.22%
0-3.61-3661.18%
0-3.6-3351.08%
4.14--3301.07%
0-3.14-3111.01%
Other6,08419.70%

MDaemon (22,668 servers)

Version Number of Servers Percent
11.0.33,69316.29%
10.1.22,1139.32%
10.0.01,3616.00%
10.1.11,2005.29%
11.0.01,1114.90%
11.0.29394.14%
9.6.18743.86%
9.6.67903.49%
10.1.07053.11%
10.0.55962.63%
11.0.15722.52%
9.6.55572.46%
9.5.25552.45%
10.0.24982.20%
10.0.44832.13%
9.5.14622.04%
9.6.44521.99%
9.6.24371.93%
8.1.34221.86%
9.5.64121.82%
9.0.43721.64%
9.5.52631.16%
9.6.32611.15%
6.8.52591.14%
7.2.32391.05%
Other3,04213.42%

IMail (12,806 servers)

Version Number of Servers Percent
8.222,43419.01%
8.151,2609.84%
11.011,0438.14%
11.029777.63%
9.239307.26%
10.025924.62%
8.055804.53%
11.05764.50%
9.104923.84%
9.204843.78%
7.073762.94%
9.213542.76%
7.152982.33%
10.012722.12%
8.002722.12%
6.062451.91%
8.042151.68%
8.211351.05%
8.101301.02%
Other1,1418.91%

Lotus Domino (5,291 servers)

Version Number of Servers Percent
8.5.164812.25%
8.54288.09%
7.0.23676.94%
8.5.1FP33366.35%
8.5.1FP22244.23%
7.0.32214.18%
8.0.22184.12%
8.0.12013.80%
7.0.11943.67%
6.5.41673.16%
6.5.11522.87%
6.5.31422.68%
7.0.3FP11282.42%
7.01232.32%
7.0.2FP21172.21%
6.5.51172.21%
8.01162.19%
8.5FP11011.91%
8.5.1FP11011.91%
6.5841.59%
5.0.11671.27%
7.0.2FP3571.08%
Other98218.56%

WinWebMail (4,966 servers)

Version Number of Servers Percent
3.8.0.11,29726.12%
3.7.6.183216.75%
3.7.7.362812.65%
3.7.3.159912.06%
3.8.1.14408.86%
3.7.1.12965.96%
3.7.5.12094.21%
3.7.7.11543.10%
3.6.3.11472.96%
3.7.0.51322.66%
3.7.0.31062.13%
3.7.0.7921.85%
Other340.68%

Kerio (4,389 servers)

Version Number of Servers Percent
6.7.373116.66%
6.6.247310.78%
6.7.044910.23%
6.7.244110.05%
6.5.02716.17%
6.7.12505.70%
6.5.22385.42%
6.4.12034.63%
6.3.11914.35%
6.5.11503.42%
6.6.01453.30%
6.4.01403.19%
6.4.21062.42%
6.6.1942.14%
6.3.0781.78%
Other4299.77%

CommuniGate Pro (3,832 servers)

Version Number of Servers Percent
5.1.162416.29%
5.3.82346.11%
4.1.82145.58%
5.2.161945.06%
4.2.101463.81%
5.3.71433.73%
5.2.191052.74%
5.3.51002.61%
5.2.14942.45%
5.1.12922.40%
5.2.3902.35%
5.2.12852.22%
5.0.14802.09%
5.2.8802.09%
5.3.2802.09%
5.1.13751.96%
5.2.13721.88%
5.2.10681.77%
5.2.20661.72%
5.2.18651.70%
5.2.9531.38%
5.1.14511.33%
5.1.9471.23%
5.0.9471.23%
5.2.0431.12%
5.3.4431.12%
5.2.17401.04%
5.2.11401.04%
4.2.9391.02%
5.2.6391.02%
Other1,06627.82%

XMail (2,608 servers)

Version Number of Servers Percent
1.2262824.08%
1.2562624.00%
1.2634113.08%
1.2434013.04%
1.271796.86%
1.211335.10%
1.23702.68%
1.20672.57%
1.17572.19%
1.12521.99%
Other1154.41%

Merak (2,530 servers)

Version Number of Servers Percent
8.0.31,05241.58%
8.9.12529.96%
8.5.01566.17%
7.4.51254.94%
7.5.21114.39%
7.6.41024.03%
8.3.81013.99%
8.2.13451.78%
7.4.2431.70%
9.0.0391.54%
7.2.0331.30%
7.6.1331.30%
8.3.15291.15%
8.2.4291.15%
7.0.1281.11%
Other35213.91%

Qmail Toaster (1,770 servers)

Version Number of Servers Percent
1.31,62491.75%
1.21086.10%
1.0281.58%
Other100.56%

ArGoSoft (1,416 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)27719.56%
1.8 (1.8.9.5)23016.24%
1.8 (1.8.9.3)18212.85%
1.8 (1.8.9.1)1278.97%
1.8 (1.8.8.8)1097.70%
1.8 (1.8.8.7)856.00%
1.8 (1.8.9.2)584.10%
1.8 (1.8.9.4)433.04%
1.8 (1.8.8.1)322.26%
1.8 (1.8.8.9)312.19%
1.8 (1.8.9.0)251.77%
1.8 (1.8.6.0)201.41%
Other19713.91%

SurgeSMTP (1,360 servers)

Version Number of Servers Percent
3.9e-114910.96%
4.3g4-41329.71%
4.2d4-41289.41%
4.3g2-21208.82%
4.3g-1846.18%
3.8k4-4836.10%
4.2d2-2725.29%
4.0u4-4705.15%
4.3e-1644.71%
3.8i3-3372.72%
4.2a3-3312.28%
3.7b8-8312.28%
3.8f3-3261.91%
3.6f5-5231.69%
3.9c-1211.54%
3.9g2-2181.32%
3.8f2-2181.32%
3.9h-18141.03%
Other23917.57%

GroupWise (1,308 servers)

Version Number of Servers Percent
7.0.335026.76%
8.0.116912.92%
6.5.716312.46%
7.0.214010.70%
7.0.1695.28%
6.5.4685.20%
6.5.6513.90%
8.0.2493.75%
8.0.0453.44%
6.0.4423.21%
6.5.1352.68%
7.0.4302.29%
6.5.5201.53%
7.0151.15%
Other624.74%

Trend Micro (899 servers)

Version Number of Servers Percent
5.740344.83%
5.525228.03%
5.1814015.57%
7.0707.79%
7141.56%
7.191.00%
Other111.22%

Gordano Messaging Suite (GMS) (558 servers)

Version Number of Servers Percent
Other558100.00%

Post.Office (547 servers)

Version Number of Servers Percent
3.5.39016.45%
4.1.0.26712.25%
4.0.1468.41%
3.5.3J305.48%
4.1.1285.12%
3.8.3274.94%
4.1.0.4193.47%
3.1.2J173.11%
3.9.2.3173.11%
3.9.1152.74%
3.6.3132.38%
3.6.2132.38%
3.9.2132.38%
3.8.7.4112.01%
3.1.2112.01%
4.1.0.3101.83%
4.0.1.1101.83%
4.0.0.2101.83%
4.191.65%
4.0.0.181.46%
3.9.2.181.46%
3.9.071.28%
3.9.1.361.10%
3.9.1.261.10%
Other5610.24%

MagicMail (461 servers)

Version Number of Servers Percent
Other461100.00%

Mirapoint (389 servers)

Version Number of Servers Percent
3.8.4-GA3910.03%
3.10.8-GA379.51%
3.10.5-GA359.00%
3.8.3-GA307.71%
3.10.9-GA297.46%
3.10.7-GA235.91%
4.1.9-GA235.91%
4.1.3-GA194.88%
3.10.4-GA184.63%
4.1.8-GA174.37%
3.10.6-GA143.60%
3.10.3-GA133.34%
3.8.7a92.31%
3.8.2-GA82.06%
4.1.4-GA82.06%
4.1.5-GA82.06%
3.8.6-GA71.80%
3.8.5-GA71.80%
3.10.2-GA61.54%
3.7.5a-GA61.54%
4.0.5a61.54%
3.10.10a-GA41.03%
3.7.3a-GA41.03%
4.1.7a-GA41.03%
Other153.86%

InterScan VirusWall (289 servers)

Version Number of Servers Percent
Other289100.00%

VisNetic (289 servers)

Version Number of Servers Percent
9.3.2.09934.26%
9.1.4.14114.19%
5.8.6.6155.19%
8.5.0.8144.84%
5.5.8.3113.81%
8.0.3.193.11%
8.0.3.082.77%
6.2.2.082.77%
7.6.1.082.77%
8.3.5.072.42%
8.0.372.42%
9.1.4.072.42%
7.2.4.162.08%
8.3.662.08%
5.3.5.062.08%
5.4.5.451.73%
7.2.4.041.38%
5.0.2.341.38%
7.5.3.031.04%
5.0.2.131.04%
5.8.6.431.04%
Other155.19%

NetIQ MailMarshal (150 servers)

Version Number of Servers Percent
6.0.3.810872.00%
5.5.6.7128.00%
6.1.3.15117.33%
5.5.6.642.67%
5.5.4.1642.67%
5.5.6.532.00%
5.5.3.1721.33%
Other64.00%

Interscan (120 servers)

Version Number of Servers Percent
3.55 (build 1016)1815.00%
3.81-Build_10221815.00%
3.53 (build 2017)1411.67%
3.55 (build 1029)1310.83%
3.81-Build_1084108.33%
3.8-Build_301397.50%
3.53 (build 2011)75.83%
3.53 (build 1493)65.00%
3.55 (build 1020)65.00%
3.53 (build 2013)32.50%
3.52 (build 1375)32.50%
3.8-Build_108021.67%
Other119.17%

Mercury (88 servers)

Version Number of Servers Percent
1.484450.00%
3.322427.27%
3.21c89.09%
3.2122.27%
3.01a22.27%
1.4722.27%
1.4922.27%
3.3022.27%
1.4411.14%
3.3111.14%
Other00.00%

WebSTAR V (76 servers)

Version Number of Servers Percent
5.4.12634.21%
5.3.41823.68%
5.4.01823.68%
5.3.279.21%
5.3.356.58%
5.3.011.32%
5.3.111.32%
Other00.00%

Neon Mail Server (71 servers)

Version Number of Servers Percent
3.1.31926.76%
3.0.71419.72%
3.0.91115.49%
3.1.41014.08%
3.1.268.45%
3.1.045.63%
3.1.134.23%
3.1.534.23%
3.0.611.41%
Other00.00%

MessageWall (32 servers)

Version Number of Servers Percent
1.0.82990.62%
1.0.1113.12%
1.0.613.12%
1.1.013.12%
Other00.00%

ModusMail (32 servers)

Version Number of Servers Percent
4.35.477.0928.12%
4.2.420.0515.62%
4.35.480.0412.50%
4.1.361.2126.25%
3.2.315.026.25%
3.1.293.126.25%
3.1.302.026.25%
4.35.480.1126.25%
4.2.425.2213.12%
4.0.340.313.12%
4.3.459.013.12%
4.35.477.813.12%
Other00.00%

WebSTAR (29 servers)

Version Number of Servers Percent
Other29100.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.31460.87%
7.3626.09%
8.228.70%
6.114.35%
Other00.00%

MAILsweeper (22 servers)

Version Number of Servers Percent
4.3.20.0731.82%
4.3.17.0418.18%
4.3.6.0418.18%
4.3.14.0313.64%
4.3.19.014.55%
4.3.10.014.55%
4.3.1.014.55%
4.2.5.014.55%
Other00.00%

OpenSMTPD (6 servers)

Version Number of Servers Percent
Other6100.00%



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