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Mail (MX) Server Survey
February 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 Queried1,806,257   100.0%
Number of Servers that didn't respond284,28715.74%
    Server didn't open socket273,13315.12%
    Server didn't provide banner11,1540.62%
Server provided banner1,521,97084.26%
Server banner identifies software in use908,73150.31%

As indicated by the above table, of the 1,806,257 servers queried, only 908,731 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
Sendmail245,02126.96%
Microsoft201,69522.20%
Exim196,56021.63%
Postfix143,60115.80%
IMail26,7292.94%
MailEnable22,5322.48%
MDaemon22,2422.45%
Lotus Domino6,9860.77%
Merak6,5040.72%
Kerio5,2640.58%
CommuniGate Pro4,9270.54%
WinWebMail4,4110.49%
Trend Micro3,5600.39%
GroupWise3,1350.34%
ArGoSoft2,7380.30%
XMail2,5930.29%
SurgeSMTP1,8150.20%
Qmail Toaster1,5830.17%
Gordano Messaging Suite (GMS)1,0690.12%
Post.Office9880.11%
NetIQ MailMarshal7750.09%
InterScan VirusWall7480.08%
Interscan6040.07%
Mirapoint5760.06%
VisNetic5350.06%
MagicMail3590.04%
ModusMail2400.03%
WebSTAR V2260.02%
Mercury2190.02%
Neon Mail Server1730.02%
MAILsweeper1040.01%
MessageWall950.01%
WebSTAR860.01%
OpenVMS380.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (245,021 servers)

Version Number of Servers Percent
8.12.11.2006061438,57115.74%
8.12.11.2006030829,74212.14%
8.13.128,28611.54%
8.13.623,6169.64%
8.11.621,6248.83%
8.13.815,7286.42%
8.12.1015,5386.34%
8.13.6.2006061410,5204.29%
8.12.119,2143.76%
8.14.19,1463.73%
8.13.47,8673.21%
8.12.86,6532.72%
8.13.75,9352.42%
8.9.33,8541.57%
8.10.23,5471.45%
8.14.22,8151.15%
Other12,3655.05%

Microsoft (201,695 servers)

Version Number of Servers Percent
6.0.3790.3959113,57156.31%
6.0.3790.183053,21626.38%
5.0.2195.671321,13610.48%
6.0.3790.2118,5114.22%
Other5,2612.61%

Exim (196,560 servers)

Version Number of Servers Percent
4.68122,76662.46%
4.6331,96216.26%
4.667,4623.80%
4.607,1033.61%
4.506,7103.41%
4.674,6612.37%
4.624,0352.05%
4.521,9851.01%
Other9,8765.02%

Postfix (143,601 servers)

Version Number of Servers Percent
Other143,601100.00%

IMail (26,729 servers)

Version Number of Servers Percent
8.225,36620.08%
8.155,16919.34%
8.051,8817.04%
9.101,5555.82%
9.211,5455.78%
9.231,4065.26%
9.221,2794.79%
7.071,0714.01%
7.159933.72%
9.209283.47%
6.067762.90%
8.005892.20%
8.215321.99%
8.203791.42%
8.043401.27%
8.103021.13%
8.012721.02%
Other2,3468.78%

MailEnable (22,532 servers)

Version Number of Servers Percent
1.981--5,50324.42%
1.983--1,8868.37%
1.96--1,8118.04%
1.95--1,5176.73%
1.9--1,3796.12%
1.8--1,1905.28%
0-1.85-1,0064.46%
0-2.37-1,0054.46%
0-2.38-6322.80%
0-3.04-5862.60%
0-2.36-4832.14%
0--2.374091.82%
0--2.383651.62%
0-2.40-3621.61%
0--3.043601.60%
0-1.841-2411.07%
Other3,79716.85%

MDaemon (22,242 servers)

Version Number of Servers Percent
9.6.35,05522.73%
9.6.22,27310.22%
9.5.61,2555.64%
9.6.11,2215.49%
8.1.31,0734.82%
9.0.41,0164.57%
9.5.26973.13%
9.5.16943.12%
6.8.56512.93%
7.2.35832.62%
7.2.04822.17%
9.0.14742.13%
9.5.54121.85%
9.0.03971.78%
8.1.43831.72%
9.5.43751.69%
8.0.23661.65%
9.6.03271.47%
8.1.13221.45%
9.5.32871.29%
7.1.22681.20%
8.0.32661.20%
8.1.52591.16%
9.0.72341.05%
7.2.22261.02%
7.1.02231.00%
Other2,42310.89%

Lotus Domino (6,986 servers)

Version Number of Servers Percent
7.0.291113.04%
7.0.2FP25387.70%
6.5.44876.97%
7.0.14536.48%
6.5.14216.03%
6.5.33555.08%
8.03505.01%
6.5.53264.67%
7.03084.41%
7.0.2FP12593.71%
6.52493.56%
7.0.32183.12%
5.0.111782.55%
6.5.21562.23%
5.0.121111.59%
5.0.101011.45%
7.0.1FP1991.42%
5.0.8971.39%
6.5.5FP2971.39%
5.0.13a951.36%
6.5.6951.36%
6.0.2CF1821.17%
6.5.4FP3761.09%
6.5.4FP2751.07%
6.5.6FP1701.00%
Other77911.15%

Merak (6,504 servers)

Version Number of Servers Percent
8.0.32,00430.81%
8.9.194714.56%
8.5.05087.81%
8.3.83144.83%
7.4.53124.80%
7.5.22724.18%
7.6.42604.00%
9.0.02413.71%
7.4.21612.48%
7.2.01161.78%
8.2.41061.63%
8.9.01051.61%
6.2.1911.40%
7.6.1731.12%
8.3.0721.11%
7.4.0721.11%
Other85013.07%

Kerio (5,264 servers)

Version Number of Servers Percent
6.4.11,37826.18%
6.3.183915.94%
6.4.279015.01%
6.4.065512.44%
6.3.02705.13%
6.2.21262.39%
6.1.01102.09%
6.1.31072.03%
6.1.21062.01%
6.2.01001.90%
6.1.4881.67%
6.0.10881.67%
6.0.3731.39%
Other53410.14%

CommuniGate Pro (4,927 servers)

Version Number of Servers Percent
4.1.854411.04%
5.1.133867.83%
4.2.103607.31%
5.1.123446.98%
5.1.102064.18%
5.0.91893.84%
5.0.131813.67%
5.1.111683.41%
5.1.91452.94%
5.1.81302.64%
5.1.71162.35%
4.2.81062.15%
5.2971.97%
5.1.14951.93%
4.2.7891.81%
4.2831.68%
5.1.5801.62%
4.3.12771.56%
4.2.9771.56%
5.0.11761.54%
5.0.8721.46%
4.0.6691.40%
5.1.3661.34%
5.1.2571.16%
5.1.6561.14%
4.3.8521.06%
Other1,00620.42%

WinWebMail (4,411 servers)

Version Number of Servers Percent
3.7.3.11,53034.69%
3.7.1.185419.36%
3.7.5.156012.70%
3.6.3.149911.31%
3.7.0.54079.23%
3.7.0.72656.01%
3.7.0.32415.46%
Other551.25%

Trend Micro (3,560 servers)

Version Number of Servers Percent
5.71,63345.87%
5.51,37138.51%
5.1843912.33%
7.0651.83%
Other521.46%

GroupWise (3,135 servers)

Version Number of Servers Percent
7.0.21,05133.52%
7.0.147215.06%
6.5.737912.09%
6.5.42538.07%
6.5.61705.42%
6.0.41524.85%
7.01183.76%
6.5.51163.70%
6.5.11013.22%
6.0.2471.50%
6.5.3451.44%
6.5.2441.40%
6.0.3411.31%
5.5.5331.05%
Other1133.60%

ArGoSoft (2,738 servers)

Version Number of Servers Percent
1.8 (1.8.9.1)51518.81%
1.8 (1.8.9.3)41615.19%
1.8 (1.8.8.8)35613.00%
1.8 (1.8.8.7)28110.26%
1.8 (1.8.9.2)2569.35%
1.8 (1.8.8.9)1244.53%
1.8 (1.8.9.0)682.48%
1.8 (1.8.8.1)652.37%
1.8 (1.8.8.2)592.15%
1.8 (1.8.6.0)491.79%
1.8 (1.8.8.4)331.21%
1.8 (1.8.5.9)331.21%
1.8 (1.8.8.3)311.13%
1.8 (1.8.8.5)281.02%
Other42415.49%

XMail (2,593 servers)

Version Number of Servers Percent
1.2286733.44%
1.2465525.26%
1.2132812.65%
1.201525.86%
1.171415.44%
1.231325.09%
1.12823.16%
1.25612.35%
1.16431.66%
1.18391.50%
Other933.59%

SurgeSMTP (1,815 servers)

Version Number of Servers Percent
3.8k4-459732.89%
3.8i3-319210.58%
3.7b8-81729.48%
3.8f3-31045.73%
3.8q-11035.67%
3.6f5-5754.13%
3.5b3-3593.25%
3.8f2-2593.25%
3.8k2-2573.14%
3.0c2-2482.64%
3.7b6-6392.15%
3.8m-1251.38%
3.8k-1241.32%
3.8i-1231.27%
3.8o-1231.27%
2.1c7-7191.05%
Other19610.80%

Qmail Toaster (1,583 servers)

Version Number of Servers Percent
1.31,15072.65%
1.236122.80%
1.0724.55%
Other00.00%

Gordano Messaging Suite (GMS) (1,069 servers)

Version Number of Servers Percent
Other1,069100.00%

Post.Office (988 servers)

Version Number of Servers Percent
3.5.325625.91%
4.0.1969.72%
3.5.3J787.89%
3.8.3606.07%
3.6.3585.87%
3.6.2373.74%
3.9.1353.54%
3.9.2.3333.34%
3.1.2J313.14%
3.9.2252.53%
3.9.0242.43%
3.1.2242.43%
3.8.7.4232.33%
3.8.4202.02%
3.5.2181.82%
4.0.0.2161.62%
3.6.0151.52%
3.9.1.3151.52%
3.8.2141.42%
4.0.0.1131.32%
4.1121.21%
3.9.2.1121.21%
Other737.39%

NetIQ MailMarshal (775 servers)

Version Number of Servers Percent
6.0.3.859276.39%
5.5.6.7486.19%
6.1.3.15374.77%
5.5.6.6182.32%
5.5.4.16151.94%
5.5.5.9141.81%
5.5.6.5141.81%
5.5.5.6101.29%
5.5.4.1781.03%
Other192.45%

InterScan VirusWall (748 servers)

Version Number of Servers Percent
Other748100.00%

Interscan (604 servers)

Version Number of Servers Percent
3.55 (build 1016)11519.04%
3.81-Build_10227111.75%
3.8-Build_30136911.42%
3.53 (build 2017)528.61%
3.55 (build 1029)528.61%
3.53 (build 2011)518.44%
3.81-Build_1084437.12%
3.53 (build 1493)233.81%
3.53 (build 2013)233.81%
3.52 (build 1375)152.48%
3.55 (build 1020)152.48%
3.8-Build_1080101.66%
3.81-Build_105571.16%
3.8-Build_306571.16%
Other518.44%

Mirapoint (576 servers)

Version Number of Servers Percent
3.8.3-GA11219.44%
3.8.4-GA10518.23%
3.8.5-GA8013.89%
3.7.5a-GA6010.42%
3.8.6-GA467.99%
3.8.2-GA457.81%
3.7.3a-GA274.69%
3.7.4b-GA264.51%
3.7.5-GA132.26%
1.1.091.56%
3.5.8-GR91.56%
3.7.1-GA81.39%
3.7.2-GA81.39%
Other284.86%

VisNetic (535 servers)

Version Number of Servers Percent
8.5.0.86311.78%
9.1.4.0519.53%
9.1.4.1488.97%
7.2.4.1366.73%
5.8.6.6305.61%
8.0.3.0285.23%
8.3.5.0264.86%
6.2.2.0244.49%
8.0.3.1244.49%
5.0.2.3244.49%
5.5.8.3234.30%
7.6.1.0183.36%
8.0.3162.99%
8.3.6142.62%
8.5.0.5132.43%
5.3.5.0132.43%
5.4.5.4122.24%
7.5.3.0101.87%
8.3.0.171.31%
5.8.6.471.31%
7.2.4.061.12%
Other427.85%

MagicMail (359 servers)

Version Number of Servers Percent
Other359100.00%

ModusMail (240 servers)

Version Number of Servers Percent
4.35.480.08234.17%
3.2.315.03012.50%
4.1.361.212711.25%
4.2.425.222510.42%
4.35.477.0187.50%
3.1.302.093.75%
4.3.459.093.75%
4.35.480.1183.33%
3.0.273.072.92%
4.2.420.052.08%
4.0.340.041.67%
4.1.361.031.25%
Other135.42%

WebSTAR V (226 servers)

Version Number of Servers Percent
5.4.07030.97%
5.4.15725.22%
5.3.45022.12%
5.3.3229.73%
5.3.2187.96%
5.3.062.65%
Other31.33%

Mercury (219 servers)

Version Number of Servers Percent
1.489945.21%
3.327132.42%
3.21c188.22%
3.3194.11%
1.4483.65%
1.4762.74%
Other83.65%

Neon Mail Server (173 servers)

Version Number of Servers Percent
3.0.74727.17%
3.0.94526.01%
3.1.23620.81%
3.1.03117.92%
3.0.842.31%
3.0.642.31%
3.1.321.16%
3.0.521.16%
Other21.16%

MAILsweeper (104 servers)

Version Number of Servers Percent
4.3.20.02019.23%
4.3.17.01615.38%
4.3.14.01514.42%
4.3.19.01413.46%
4.3.12.0109.62%
4.2.10.087.69%
4.3.1.065.77%
4.3.6.054.81%
4.3.10.043.85%
4.2.5.032.88%
4.2.1.021.92%
Other10.96%

MessageWall (95 servers)

Version Number of Servers Percent
1.0.87578.95%
1.0.111616.84%
1.1.022.11%
1.0.622.11%
Other00.00%

WebSTAR (86 servers)

Version Number of Servers Percent
Other86100.00%

OpenVMS (38 servers)

Version Number of Servers Percent
8.31128.95%
7.31128.95%
8.21026.32%
7.2513.16%
6.112.63%
Other00.00%




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