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Mail (MX) Server Survey
May 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 Queried1,854,017   100.0%
Number of Servers that didn't respond292,65715.79%
    Server didn't open socket281,21415.17%
    Server didn't provide banner11,4430.62%
Server provided banner1,561,36084.21%
Server banner identifies software in use921,54049.71%

As indicated by the above table, of the 1,854,017 servers queried, only 921,540 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
Sendmail235,30825.53%
Exim210,00322.79%
Microsoft203,39322.07%
Postfix151,65216.46%
IMail24,9132.70%
MailEnable23,8602.59%
MDaemon22,9752.49%
Lotus Domino6,8640.74%
Merak5,9720.65%
Kerio5,6720.62%
WinWebMail4,9610.54%
CommuniGate Pro4,8960.53%
Trend Micro3,1490.34%
GroupWise2,9360.32%
XMail2,6710.29%
ArGoSoft2,5960.28%
SurgeSMTP1,7690.19%
Qmail Toaster1,6780.18%
Gordano Messaging Suite (GMS)9910.11%
Post.Office9180.10%
NetIQ MailMarshal6630.07%
InterScan VirusWall6470.07%
Mirapoint5830.06%
VisNetic5190.06%
Interscan4980.05%
MagicMail4000.04%
WebSTAR V2120.02%
Mercury1940.02%
ModusMail1860.02%
Neon Mail Server1780.02%
MAILsweeper910.01%
WebSTAR820.01%
MessageWall790.01%
OpenVMS310.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (235,308 servers)

Version Number of Servers Percent
8.12.11.2006061434,63914.72%
8.13.134,61214.71%
8.12.11.2006030822,8479.71%
8.13.622,3179.48%
8.11.619,1358.13%
8.13.817,1137.27%
8.12.1013,9995.95%
8.13.6.2006061410,7644.57%
8.14.19,3883.99%
8.12.118,1723.47%
8.13.47,0693.00%
8.12.86,0282.56%
8.14.25,9122.51%
8.13.75,6412.40%
8.9.33,4351.46%
8.10.23,0151.28%
Other11,2224.77%

Exim (210,003 servers)

Version Number of Servers Percent
4.68139,73466.54%
4.6328,67313.65%
4.676,2712.99%
4.606,1102.91%
4.505,6902.71%
4.665,3582.55%
4.694,4342.11%
4.624,1942.00%
Other9,5394.54%

Microsoft (203,393 servers)

Version Number of Servers Percent
6.0.3790.3959130,36964.10%
6.0.3790.183043,44221.36%
5.0.2195.671318,2969.00%
6.0.3790.2116,8073.35%
Other4,4792.20%

Postfix (151,652 servers)

Version Number of Servers Percent
Other151,652100.00%

IMail (24,913 servers)

Version Number of Servers Percent
8.225,24021.03%
8.154,47417.96%
9.232,80511.26%
8.051,4755.92%
9.101,3935.59%
9.211,1994.81%
7.079753.91%
7.159183.68%
9.227853.15%
6.066732.70%
8.005902.37%
9.205732.30%
8.214571.83%
8.043581.44%
8.102901.16%
8.012851.14%
8.202791.12%
Other2,1448.61%

MailEnable (23,860 servers)

Version Number of Servers Percent
1.981--5,95024.94%
1.983--2,59610.88%
1.96--1,6046.72%
1.95--1,4786.19%
1.9--1,2405.20%
1.8--1,0064.22%
0-1.85-8863.71%
0-2.37-8633.62%
0-2.38-4812.02%
0-3.14-4741.99%
0-3.04-4651.95%
0-2.36-4341.82%
1.986--3441.44%
0--2.373241.36%
0--2.382461.03%
0-2.40-2411.01%
Other5,22821.91%

MDaemon (22,975 servers)

Version Number of Servers Percent
9.6.53,97117.28%
9.6.42,68411.68%
9.6.21,4076.12%
9.6.11,3395.83%
9.6.31,0454.55%
9.5.61,0254.46%
8.1.31,0184.43%
9.0.49274.03%
9.5.27743.37%
9.5.16812.96%
6.8.55882.56%
7.2.35392.35%
7.2.04622.01%
9.0.14571.99%
9.5.53731.62%
8.0.23531.54%
9.0.03451.50%
8.1.43441.50%
9.5.43131.36%
8.1.13011.31%
9.6.02921.27%
8.1.52511.09%
8.0.32471.08%
7.1.22431.06%
9.5.32391.04%
Other2,75712.00%

Lotus Domino (6,864 servers)

Version Number of Servers Percent
7.0.287012.67%
7.0.14386.38%
6.5.44366.35%
7.0.2FP24336.31%
6.5.13745.45%
7.0.33695.38%
6.5.33344.87%
8.02914.24%
7.02894.21%
8.0.12854.15%
6.5.52844.14%
6.52343.41%
7.0.2FP12263.29%
5.0.111602.33%
6.5.21522.21%
5.0.121021.49%
6.5.6951.38%
5.0.8901.31%
5.0.13a861.25%
6.5.5FP2841.22%
5.0.10821.19%
6.5.4FP3711.03%
7.0.1FP1701.02%
Other1,00914.70%

Merak (5,972 servers)

Version Number of Servers Percent
8.0.32,08534.91%
8.9.171611.99%
8.5.04337.25%
7.4.52914.87%
8.3.82754.60%
7.5.22644.42%
7.6.42604.35%
9.0.01582.65%
7.4.21442.41%
7.2.01041.74%
8.2.4911.52%
6.2.1891.49%
7.6.1771.29%
8.9.0721.21%
8.3.0691.16%
Other84414.13%

Kerio (5,672 servers)

Version Number of Servers Percent
6.5.01,34123.64%
6.4.187315.39%
6.4.284914.97%
6.3.171912.68%
6.4.04898.62%
6.3.02434.28%
6.2.21091.92%
6.1.31001.76%
6.1.0891.57%
6.2.0891.57%
6.0.10831.46%
6.1.2771.36%
6.1.4741.30%
6.0.3621.09%
Other4758.37%

WinWebMail (4,961 servers)

Version Number of Servers Percent
3.7.3.11,53330.90%
3.7.1.187517.64%
3.7.6.156411.37%
3.7.5.155811.25%
3.6.3.14719.49%
3.7.0.54038.12%
3.7.0.72575.18%
3.7.0.32424.88%
Other581.17%

CommuniGate Pro (4,896 servers)

Version Number of Servers Percent
4.1.849910.19%
4.2.103126.37%
5.1.133006.13%
5.1.122725.56%
5.2.02184.45%
5.1.142144.37%
5.1.101853.78%
5.0.91593.25%
5.0.131563.19%
5.2.11563.19%
5.1.91162.37%
5.1.71122.29%
5.1.81092.23%
5.1.111072.19%
4.2.8841.72%
4.2.7791.61%
4.3.12761.55%
4.2741.51%
4.2.9721.47%
5.1.5701.43%
5.0.11691.41%
5.0.14661.35%
4.0.6641.31%
5.2611.25%
5.0.8611.25%
5.1.3591.21%
Other1,14623.41%

Trend Micro (3,149 servers)

Version Number of Servers Percent
5.71,46746.59%
5.51,14236.27%
5.1841113.05%
7.0782.48%
Other511.62%

GroupWise (2,936 servers)

Version Number of Servers Percent
7.0.292831.61%
7.0.137412.74%
6.5.736012.26%
6.5.42187.43%
7.0.32157.32%
6.5.61525.18%
6.0.41394.73%
7.01053.58%
6.5.51003.41%
6.5.1913.10%
6.5.2391.33%
6.0.2351.19%
6.0.3321.09%
6.5.3311.06%
Other1173.99%

XMail (2,671 servers)

Version Number of Servers Percent
1.2285231.90%
1.2459022.09%
1.2130511.42%
1.2528810.78%
1.201425.32%
1.171284.79%
1.231254.68%
1.12803.00%
1.16441.65%
1.18301.12%
Other873.26%

ArGoSoft (2,596 servers)

Version Number of Servers Percent
1.8 (1.8.9.3)62824.19%
1.8 (1.8.9.1)39315.14%
1.8 (1.8.8.8)27410.55%
1.8 (1.8.8.7)2328.94%
1.8 (1.8.9.2)1957.51%
1.8 (1.8.8.9)963.70%
1.8 (1.8.9.4)873.35%
1.8 (1.8.9.0)552.12%
1.8 (1.8.8.1)532.04%
1.8 (1.8.8.2)481.85%
1.8 (1.8.6.0)451.73%
1.8 (1.8.5.9)321.23%
1.8 (1.8.7.5)301.16%
1.8 (1.8.8.3)281.08%
1.8 (1.8.8.4)261.00%
Other37414.41%

SurgeSMTP (1,769 servers)

Version Number of Servers Percent
3.9c-145525.72%
3.8k4-435620.12%
3.8i3-31568.82%
3.7b8-8945.31%
3.8f3-3935.26%
3.6f5-5663.73%
3.9a-1643.62%
3.5b3-3613.45%
3.8f2-2522.94%
3.9d-7442.49%
3.0c2-2412.32%
3.7b6-6311.75%
3.8k2-2261.47%
3.8i-1191.07%
Other21111.93%

Qmail Toaster (1,678 servers)

Version Number of Servers Percent
1.31,26675.45%
1.232819.55%
1.0684.05%
Other160.95%

Gordano Messaging Suite (GMS) (991 servers)

Version Number of Servers Percent
Other991100.00%

Post.Office (918 servers)

Version Number of Servers Percent
3.5.323625.71%
4.0.1889.59%
3.5.3J677.30%
3.6.3545.88%
3.8.3525.66%
3.6.2384.14%
3.9.1353.81%
3.9.2.3343.70%
3.1.2J272.94%
3.9.2232.51%
3.8.7.4232.51%
3.9.0222.40%
3.1.2222.40%
3.8.4202.18%
3.5.2151.63%
4.0.0.2141.53%
4.1141.53%
4.0.0.1121.31%
3.9.1.3121.31%
3.6.0111.20%
4.1.0.2111.20%
3.9.2.1101.09%
3.8.2101.09%
Other687.41%

NetIQ MailMarshal (663 servers)

Version Number of Servers Percent
6.0.3.851277.22%
5.5.6.7385.73%
6.1.3.15345.13%
5.5.4.16172.56%
5.5.6.6142.11%
5.5.5.9131.96%
5.5.6.591.36%
5.5.5.671.06%
Other192.87%

InterScan VirusWall (647 servers)

Version Number of Servers Percent
Other647100.00%

Mirapoint (583 servers)

Version Number of Servers Percent
3.8.4-GA11820.24%
3.8.3-GA9616.47%
3.8.6-GA7913.55%
3.8.5-GA7412.69%
3.7.5a-GA539.09%
3.8.2-GA406.86%
3.7.4b-GA244.12%
3.7.3a-GA244.12%
3.7.5-GA132.23%
3.5.8-GR111.89%
1.1.081.37%
3.7.2-GA61.03%
3.7.1-GA61.03%
Other315.32%

VisNetic (519 servers)

Version Number of Servers Percent
9.1.4.19718.69%
9.1.4.0509.63%
8.5.0.8387.32%
5.8.6.6315.97%
7.2.4.1295.59%
5.0.2.3285.39%
8.3.5.0254.82%
8.0.3.0254.82%
5.5.8.3224.24%
6.2.2.0193.66%
8.0.3.1173.28%
8.0.3152.89%
7.6.1.0142.70%
5.3.5.0132.50%
8.3.6112.12%
7.5.3.0112.12%
5.4.5.4101.93%
8.5.0.591.73%
7.2.4.081.54%
5.8.6.471.35%
Other407.71%

Interscan (498 servers)

Version Number of Servers Percent
3.55 (build 1016)8817.67%
3.8-Build_30136513.05%
3.81-Build_10225711.45%
3.55 (build 1029)5110.24%
3.53 (build 2017)428.43%
3.53 (build 2011)408.03%
3.81-Build_1084275.42%
3.53 (build 2013)224.42%
3.53 (build 1493)214.22%
3.55 (build 1020)132.61%
3.52 (build 1375)122.41%
3.8-Build_108091.81%
3.55 (build 1018)61.20%
3.8-Build_306551.00%
Other408.03%

MagicMail (400 servers)

Version Number of Servers Percent
Other400100.00%

WebSTAR V (212 servers)

Version Number of Servers Percent
5.4.16229.25%
5.4.05626.42%
5.3.44722.17%
5.3.32210.38%
5.3.2178.02%
5.3.062.83%
Other20.94%

Mercury (194 servers)

Version Number of Servers Percent
1.488845.36%
3.326332.47%
3.21c199.79%
3.3173.61%
1.4452.58%
1.4752.58%
1.4921.03%
3.2121.03%
Other31.55%

ModusMail (186 servers)

Version Number of Servers Percent
4.35.480.07841.94%
4.1.361.212312.37%
3.2.315.0179.14%
4.35.477.0136.99%
3.1.302.084.30%
4.3.459.084.30%
4.35.480.1173.76%
4.2.425.2273.76%
4.2.420.052.69%
3.1.293.131.61%
4.1.361.031.61%
4.0.340.031.61%
4.2.420.121.08%
4.4.568.021.08%
Other73.76%

Neon Mail Server (178 servers)

Version Number of Servers Percent
3.0.74223.60%
3.0.93620.22%
3.1.33419.10%
3.1.22815.73%
3.1.02312.92%
3.0.852.81%
3.0.642.25%
3.1.131.69%
3.0.521.12%
Other10.56%

MAILsweeper (91 servers)

Version Number of Servers Percent
4.3.20.02224.18%
4.3.17.01415.38%
4.3.14.01314.29%
4.3.19.099.89%
4.3.1.088.79%
4.3.12.077.69%
4.2.10.077.69%
4.3.6.044.40%
4.3.10.033.30%
4.2.5.022.20%
4.2.1.011.10%
4.1.5.011.10%
Other00.00%

WebSTAR (82 servers)

Version Number of Servers Percent
Other82100.00%

MessageWall (79 servers)

Version Number of Servers Percent
1.0.86075.95%
1.0.111721.52%
1.1.022.53%
Other00.00%

OpenVMS (31 servers)

Version Number of Servers Percent
8.31238.71%
7.3825.81%
8.2722.58%
7.2412.90%
Other00.00%




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