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Mail (MX) Server Survey
June 1st, 2008

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 Queried1,862,302   100.0%
Number of Servers that didn't respond291,12915.63%
    Server didn't open socket279,89615.03%
    Server didn't provide banner11,2330.60%
Server provided banner1,571,17384.37%
Server banner identifies software in use923,27149.58%

As indicated by the above table, of the 1,862,302 servers queried, only 923,271 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
Sendmail233,00125.24%
Exim213,61923.14%
Microsoft202,52421.94%
Postfix154,01116.68%
MailEnable24,3842.64%
IMail23,7952.58%
MDaemon22,9692.49%
Lotus Domino6,7140.73%
Merak5,8500.63%
Kerio5,8260.63%
WinWebMail4,9980.54%
CommuniGate Pro4,8570.53%
Trend Micro2,9920.32%
GroupWise2,8370.31%
XMail2,6950.29%
ArGoSoft2,5720.28%
SurgeSMTP1,7940.19%
Qmail Toaster1,7190.19%
Gordano Messaging Suite (GMS)9770.11%
Post.Office8840.10%
InterScan VirusWall6420.07%
NetIQ MailMarshal6040.07%
Mirapoint5980.06%
VisNetic5060.05%
Interscan4750.05%
MagicMail4130.04%
WebSTAR V2030.02%
Mercury1930.02%
Neon Mail Server1810.02%
ModusMail1690.02%
MAILsweeper840.01%
WebSTAR790.01%
MessageWall740.01%
OpenVMS320.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (233,001 servers)

Version Number of Servers Percent
8.13.135,98215.44%
8.12.11.2006061433,62014.43%
8.13.622,4759.65%
8.12.11.2006030821,1929.10%
8.11.618,5027.94%
8.13.817,4897.51%
8.12.1013,4835.79%
8.13.6.2006061410,8104.64%
8.14.19,4004.03%
8.12.117,8543.37%
8.13.46,9202.97%
8.12.85,8132.49%
8.13.75,5682.39%
8.14.25,1462.21%
8.9.33,3261.43%
8.10.22,8701.23%
Other12,5515.39%

Exim (213,619 servers)

Version Number of Servers Percent
4.68144,37467.58%
4.6327,45412.85%
4.676,7573.16%
4.605,7472.69%
4.505,5322.59%
4.665,2242.45%
4.695,1092.39%
4.624,2461.99%
Other9,1764.30%

Microsoft (202,524 servers)

Version Number of Servers Percent
6.0.3790.3959134,21466.27%
6.0.3790.183040,52520.01%
5.0.2195.671317,2738.53%
6.0.3790.2116,2933.11%
Other4,2192.08%

Postfix (154,011 servers)

Version Number of Servers Percent
Other154,011100.00%

MailEnable (24,384 servers)

Version Number of Servers Percent
1.981--5,99924.60%
1.983--2,88611.84%
1.96--1,5476.34%
1.95--1,4245.84%
1.9--1,2094.96%
1.8--9924.07%
0-2.37-8163.35%
0-3.14-8133.33%
0-1.85-7953.26%
1.986--6022.47%
0-2.38-4411.81%
0-2.36-4181.71%
0--3.143951.62%
0-3.04-3751.54%
0--2.372991.23%
0-2.52-2551.05%
Other5,11820.99%

IMail (23,795 servers)

Version Number of Servers Percent
8.224,88420.53%
8.154,34718.27%
9.232,51010.55%
8.051,4626.14%
9.101,2145.10%
9.211,0344.35%
7.079453.97%
7.158983.77%
9.227373.10%
10.06582.77%
6.066452.71%
8.005132.16%
9.205012.11%
8.214501.89%
8.043481.46%
8.102811.18%
8.012791.17%
8.202631.11%
Other1,8267.67%

MDaemon (22,969 servers)

Version Number of Servers Percent
9.6.55,39023.47%
9.6.41,9678.56%
9.6.11,3946.07%
9.6.21,2685.52%
8.1.39814.27%
9.5.69484.13%
9.6.39013.92%
9.0.48853.85%
9.5.27763.38%
9.5.17023.06%
6.8.55592.43%
7.2.35192.26%
7.2.04491.95%
9.0.14181.82%
9.5.53661.59%
8.0.23421.49%
9.0.03411.48%
8.1.43261.42%
9.5.42921.27%
9.6.02801.22%
8.1.12761.20%
8.1.52461.07%
9.5.32321.01%
8.0.32301.00%
Other2,88112.54%

Lotus Domino (6,714 servers)

Version Number of Servers Percent
7.0.280411.97%
6.5.44206.26%
7.0.14166.20%
8.0.14086.08%
7.0.2FP24025.99%
7.0.33745.57%
6.5.13625.39%
6.5.33154.69%
8.02774.13%
6.5.52714.04%
7.02673.98%
6.52273.38%
7.0.2FP12023.01%
5.0.111552.31%
6.5.21432.13%
6.5.6971.44%
5.0.12961.43%
5.0.13a831.24%
5.0.8831.24%
5.0.10811.21%
7.0.3FP1761.13%
7.0.1FP1761.13%
6.5.5FP2751.12%
6.5.4FP3681.01%
Other93613.94%

Merak (5,850 servers)

Version Number of Servers Percent
8.0.32,12536.32%
8.9.166511.37%
8.5.04107.01%
7.4.52874.91%
8.3.82684.58%
7.5.22614.46%
7.6.42554.36%
9.0.01462.50%
7.4.21372.34%
7.2.0971.66%
8.2.4881.50%
6.2.1831.42%
7.6.1751.28%
8.9.0661.13%
8.3.0611.04%
Other82614.12%

Kerio (5,826 servers)

Version Number of Servers Percent
6.5.01,91332.84%
6.4.178413.46%
6.4.267311.55%
6.3.165811.29%
6.4.04487.69%
6.3.02404.12%
6.2.2971.66%
6.1.3951.63%
6.2.0881.51%
6.1.0861.48%
6.0.10781.34%
6.1.4721.24%
6.1.2701.20%
6.0.3601.03%
Other4647.96%

WinWebMail (4,998 servers)

Version Number of Servers Percent
3.7.3.11,46029.21%
3.7.1.185417.09%
3.7.6.177115.43%
3.7.5.152610.52%
3.6.3.14629.24%
3.7.0.53877.74%
3.7.0.72474.94%
3.7.0.32364.72%
Other551.10%

CommuniGate Pro (4,857 servers)

Version Number of Servers Percent
4.1.84729.72%
4.2.103046.26%
5.1.132755.66%
5.1.122575.29%
5.2.01863.83%
5.1.101793.69%
5.1.141723.54%
5.0.91533.15%
5.0.131483.05%
5.1.161452.99%
5.2.21422.92%
5.2.11282.64%
5.1.91122.31%
5.1.71072.20%
5.1.81052.16%
5.1.111002.06%
4.2.8761.56%
5.0.14751.54%
4.2751.54%
4.2.7711.46%
4.2.9701.44%
5.1.5661.36%
5.0.11651.34%
4.0.6641.32%
5.0.8581.19%
5.1.3581.19%
4.3.12571.17%
5.2531.09%
5.2.3531.09%
Other1,03121.23%

Trend Micro (2,992 servers)

Version Number of Servers Percent
5.71,39546.62%
5.51,06135.46%
5.1839813.30%
7.0862.87%
5.15301.00%
Other220.74%

GroupWise (2,837 servers)

Version Number of Servers Percent
7.0.282028.90%
7.0.338113.43%
7.0.132911.60%
6.5.732411.42%
6.5.42147.54%
6.5.61404.93%
6.0.41244.37%
6.5.5923.24%
7.0893.14%
6.5.1853.00%
6.5.2391.37%
6.5.3301.06%
6.0.2301.06%
Other1404.93%

XMail (2,695 servers)

Version Number of Servers Percent
1.2284531.35%
1.2457821.45%
1.2537713.99%
1.2129310.87%
1.201435.31%
1.171204.45%
1.231194.42%
1.12792.93%
1.16361.34%
1.18271.00%
Other782.89%

ArGoSoft (2,572 servers)

Version Number of Servers Percent
1.8 (1.8.9.3)55521.58%
1.8 (1.8.9.1)36214.07%
1.8 (1.8.8.8)2579.99%
1.8 (1.8.8.7)2258.75%
1.8 (1.8.9.2)1726.69%
1.8 (1.8.9.5)1485.75%
1.8 (1.8.9.4)973.77%
1.8 (1.8.8.9)923.58%
1.8 (1.8.9.0)522.02%
1.8 (1.8.8.1)501.94%
1.8 (1.8.6.0)471.83%
1.8 (1.8.8.2)451.75%
1.8 (1.8.5.9)291.13%
1.8 (1.8.7.5)271.05%
1.8 (1.8.8.3)271.05%
1.8 (1.8.8.4)261.01%
Other36114.04%

SurgeSMTP (1,794 servers)

Version Number of Servers Percent
3.9c-146525.92%
3.8k4-431517.56%
3.9e-121211.82%
3.8f3-3945.24%
3.7b8-8864.79%
3.8i3-3844.68%
3.6f5-5653.62%
3.5b3-3583.23%
3.8f2-2502.79%
3.0c2-2402.23%
3.9d-7351.95%
3.7b6-6301.67%
3.8k2-2231.28%
Other23713.21%

Qmail Toaster (1,719 servers)

Version Number of Servers Percent
1.31,32477.02%
1.231118.09%
1.0653.78%
1.5181.05%
Other10.06%

Gordano Messaging Suite (GMS) (977 servers)

Version Number of Servers Percent
Other977100.00%

Post.Office (884 servers)

Version Number of Servers Percent
3.5.322925.90%
4.0.18910.07%
3.5.3J606.79%
3.6.3505.66%
3.8.3485.43%
3.6.2353.96%
3.9.1343.85%
3.9.2.3303.39%
3.1.2J262.94%
3.9.2232.60%
3.9.0222.49%
3.8.7.4222.49%
3.1.2212.38%
3.8.4202.26%
4.1.0.2161.81%
4.1141.58%
3.5.2141.58%
4.0.0.2141.58%
3.8.2121.36%
3.9.2.1111.24%
4.0.0.1111.24%
3.9.1.3101.13%
Other738.26%

InterScan VirusWall (642 servers)

Version Number of Servers Percent
Other642100.00%

NetIQ MailMarshal (604 servers)

Version Number of Servers Percent
6.0.3.846276.49%
6.1.3.15365.96%
5.5.6.7365.96%
5.5.6.6142.32%
5.5.5.9121.99%
5.5.4.16111.82%
5.5.6.591.49%
5.5.5.681.32%
Other162.65%

Mirapoint (598 servers)

Version Number of Servers Percent
3.8.4-GA12220.40%
3.8.3-GA9816.39%
3.8.6-GA8714.55%
3.8.5-GA7111.87%
3.7.5a-GA538.86%
3.8.2-GA355.85%
3.7.3a-GA233.85%
3.7.4b-GA223.68%
3.7.5-GA132.17%
3.5.8-GR111.84%
1.1.081.34%
4.0.4-FCS61.00%
3.7.1-GA61.00%
Other437.19%

VisNetic (506 servers)

Version Number of Servers Percent
9.1.4.110320.36%
9.1.4.0499.68%
8.5.0.8356.92%
5.8.6.6305.93%
7.2.4.1265.14%
5.0.2.3254.94%
8.3.5.0244.74%
8.0.3.0234.55%
5.5.8.3203.95%
8.0.3.1183.56%
6.2.2.0173.36%
7.6.1.0163.16%
5.3.5.0132.57%
8.3.6122.37%
8.0.3122.37%
5.4.5.4101.98%
7.5.3.0101.98%
8.5.0.591.78%
7.2.4.081.58%
5.8.6.461.19%
8.3.0.161.19%
Other346.72%

Interscan (475 servers)

Version Number of Servers Percent
3.55 (build 1016)8317.47%
3.8-Build_30136513.68%
3.81-Build_10225712.00%
3.55 (build 1029)459.47%
3.53 (build 2017)439.05%
3.53 (build 2011)347.16%
3.81-Build_1084245.05%
3.53 (build 2013)214.42%
3.53 (build 1493)204.21%
3.55 (build 1020)122.53%
3.52 (build 1375)112.32%
3.8-Build_108091.89%
3.55 (build 1018)61.26%
3.8-Build_306551.05%
Other408.42%

MagicMail (413 servers)

Version Number of Servers Percent
Other413100.00%

WebSTAR V (203 servers)

Version Number of Servers Percent
5.4.16230.54%
5.4.05225.62%
5.3.44421.67%
5.3.3209.85%
5.3.2178.37%
5.3.062.96%
Other20.99%

Mercury (193 servers)

Version Number of Servers Percent
1.488544.04%
3.326433.16%
3.21c199.84%
3.3173.63%
1.4452.59%
1.4752.59%
3.2131.55%
1.4921.04%
Other31.55%

Neon Mail Server (181 servers)

Version Number of Servers Percent
3.1.34424.31%
3.0.73921.55%
3.0.93217.68%
3.1.23016.57%
3.1.02212.15%
3.0.852.76%
3.0.642.21%
3.1.121.10%
3.0.521.10%
Other10.55%

ModusMail (169 servers)

Version Number of Servers Percent
4.35.480.07041.42%
4.1.361.212313.61%
3.2.315.01710.06%
4.35.477.0127.10%
4.35.480.1174.14%
4.3.459.074.14%
3.1.302.063.55%
4.2.420.052.96%
3.1.293.131.78%
4.1.361.031.78%
4.0.340.031.78%
4.2.425.421.18%
4.2.420.121.18%
4.4.568.021.18%
Other74.14%

MAILsweeper (84 servers)

Version Number of Servers Percent
4.3.20.02125.00%
4.3.14.01315.48%
4.3.17.01315.48%
4.3.19.089.52%
4.3.1.078.33%
4.3.12.067.14%
4.2.10.055.95%
4.3.6.044.76%
4.3.10.033.57%
4.2.1.022.38%
4.2.5.011.19%
4.1.5.011.19%
Other00.00%

WebSTAR (79 servers)

Version Number of Servers Percent
Other79100.00%

MessageWall (74 servers)

Version Number of Servers Percent
1.0.85777.03%
1.0.111520.27%
1.1.022.70%
Other00.00%

OpenVMS (32 servers)

Version Number of Servers Percent
8.31237.50%
7.3928.12%
8.2618.75%
7.2412.50%
6.113.12%
Other00.00%




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