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Mail (MX) Server Survey
August 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 Queried1,898,228   100.0%
Number of Servers that didn't respond317,35916.72%
    Server didn't open socket305,49716.09%
    Server didn't provide banner11,8620.62%
Server provided banner1,580,86983.28%
Server banner identifies software in use921,76148.56%

As indicated by the above table, of the 1,898,228 servers queried, only 921,761 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
Sendmail226,33724.55%
Exim221,24124.00%
Microsoft200,52121.75%
Postfix156,46016.97%
MailEnable24,9372.71%
MDaemon22,9252.49%
IMail22,2632.42%
Lotus Domino6,4890.70%
Kerio5,9700.65%
Merak5,3580.58%
WinWebMail4,9230.53%
CommuniGate Pro4,8120.52%
Trend Micro2,6850.29%
XMail2,6740.29%
GroupWise2,6360.29%
ArGoSoft2,3800.26%
SurgeSMTP1,7660.19%
Qmail Toaster1,7250.19%
Gordano Messaging Suite (GMS)9130.10%
Post.Office8350.09%
InterScan VirusWall5860.06%
Mirapoint5710.06%
NetIQ MailMarshal5400.06%
VisNetic5010.05%
MagicMail4310.05%
Interscan4050.04%
WebSTAR V1770.02%
Neon Mail Server1740.02%
Mercury1660.02%
ModusMail1140.01%
MessageWall760.01%
WebSTAR740.01%
MAILsweeper680.01%
OpenVMS280.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (226,337 servers)

Version Number of Servers Percent
8.13.136,22016.00%
8.12.11.2006061431,80214.05%
8.13.621,8509.65%
8.12.11.2006030820,4239.02%
8.13.818,4888.17%
8.11.616,7467.40%
8.12.1012,2915.43%
8.13.6.2006061410,9044.82%
8.14.18,9463.95%
8.12.117,2213.19%
8.13.46,2562.76%
8.14.25,7532.54%
8.13.75,3232.35%
8.12.85,2712.33%
8.14.33,3491.48%
8.9.33,0131.33%
8.10.22,5221.11%
Other9,9594.40%

Exim (221,241 servers)

Version Number of Servers Percent
4.69134,06560.60%
4.6826,88512.15%
4.6324,92711.27%
4.677,6843.47%
4.605,2802.39%
4.664,9512.24%
4.504,9142.22%
4.624,2951.94%
Other8,2403.72%

Microsoft (200,521 servers)

Version Number of Servers Percent
6.0.3790.3959141,21670.42%
6.0.3790.183035,30317.61%
5.0.2195.671315,1277.54%
6.0.3790.2115,0822.53%
Other3,7931.89%

Postfix (156,460 servers)

Version Number of Servers Percent
Other156,460100.00%

MailEnable (24,937 servers)

Version Number of Servers Percent
1.981--5,79423.23%
1.983--3,18612.78%
1.986--1,5436.19%
1.96--1,4915.98%
1.95--1,3345.35%
1.9--1,1174.48%
0-3.14-1,0274.12%
1.8--9003.61%
0-2.37-7402.97%
0-1.85-6312.53%
0--3.145052.03%
0-2.52-3881.56%
0-2.38-3581.44%
0-3.04-3261.31%
0-2.36-3251.30%
0--2.372611.05%
Other5,01120.09%

MDaemon (22,925 servers)

Version Number of Servers Percent
9.6.64,51219.68%
9.6.52,53311.05%
9.6.11,4876.49%
9.6.41,4236.21%
9.6.21,0514.58%
8.1.39103.97%
9.5.68883.87%
9.0.48103.53%
9.5.27743.38%
9.6.37013.06%
9.5.16592.87%
6.8.55112.23%
7.2.34932.15%
7.2.04301.88%
9.0.13921.71%
9.0.03241.41%
9.5.53181.39%
8.0.23151.37%
8.1.43011.31%
9.5.42681.17%
8.1.12641.15%
9.6.02561.12%
Other3,30514.42%

IMail (22,263 servers)

Version Number of Servers Percent
8.224,60420.68%
8.153,58916.12%
9.232,1449.63%
8.051,3175.92%
9.101,1425.13%
10.01,0804.85%
7.078803.95%
7.158313.73%
9.218263.71%
9.226652.99%
6.065852.63%
8.005212.34%
8.214592.06%
9.204592.06%
10.013961.78%
8.043341.50%
8.012611.17%
8.102601.17%
8.202331.05%
Other1,6777.53%

Lotus Domino (6,489 servers)

Version Number of Servers Percent
7.0.274311.45%
8.0.16429.89%
7.0.33845.92%
7.0.13795.84%
6.5.43575.50%
7.0.2FP23405.24%
6.5.13224.96%
6.5.32934.52%
6.5.52634.05%
8.02614.02%
7.02614.02%
6.52123.27%
7.0.2FP11792.76%
7.0.3FP11482.28%
5.0.111342.07%
6.5.21221.88%
5.0.12861.33%
6.5.6851.31%
5.0.13a771.19%
5.0.8721.11%
7.0.2FP3721.11%
7.0.1FP1671.03%
6.5.5FP2651.00%
5.0.10651.00%
Other86013.25%

Kerio (5,970 servers)

Version Number of Servers Percent
6.5.11,18219.80%
6.5.01,01216.95%
6.4.161710.34%
6.5.25819.73%
6.3.15409.05%
6.4.24547.60%
6.4.03706.20%
6.3.02103.52%
6.1.3911.52%
6.2.2821.37%
6.1.0801.34%
6.0.10771.29%
6.2.0761.27%
6.1.2701.17%
6.1.4661.11%
6.0.3651.09%
Other3976.65%

Merak (5,358 servers)

Version Number of Servers Percent
8.0.32,01637.63%
8.9.156510.54%
8.5.03757.00%
7.4.52765.15%
7.6.42484.63%
8.3.82474.61%
7.5.22424.52%
9.0.01152.15%
7.4.21132.11%
6.2.1831.55%
7.2.0831.55%
8.2.4761.42%
7.6.1741.38%
8.9.0571.06%
8.2.13551.03%
Other73313.68%

WinWebMail (4,923 servers)

Version Number of Servers Percent
3.7.3.11,31326.67%
3.7.6.11,24025.19%
3.7.1.175215.28%
3.7.5.14198.51%
3.6.3.14098.31%
3.7.0.53366.83%
3.7.0.72074.20%
3.7.0.31994.04%
Other480.98%

CommuniGate Pro (4,812 servers)

Version Number of Servers Percent
4.1.84218.75%
4.2.102805.82%
5.1.132705.61%
5.1.122284.74%
5.2.52244.66%
5.2.32024.20%
5.1.161763.66%
5.1.141613.35%
5.2.01523.16%
5.1.101483.08%
5.0.131352.81%
5.0.91342.78%
5.1.81062.20%
5.1.71002.08%
5.2.2921.91%
5.1.9881.83%
5.0.14871.81%
5.1.11861.79%
5.2.1831.72%
4.2711.48%
4.2.9681.41%
4.2.8681.41%
5.2.4671.39%
4.2.7641.33%
5.0.8591.23%
4.3.12581.21%
5.1.5581.21%
4.0.6561.16%
5.0.11561.16%
5.1.3501.04%
Other96420.03%

Trend Micro (2,685 servers)

Version Number of Servers Percent
5.71,25346.67%
5.591734.15%
5.1837614.00%
7.0953.54%
Other441.64%

XMail (2,674 servers)

Version Number of Servers Percent
1.2282030.67%
1.2453720.08%
1.2547317.69%
1.212619.76%
1.201304.86%
1.231204.49%
1.171184.41%
1.12782.92%
1.16411.53%
Other963.59%

GroupWise (2,636 servers)

Version Number of Servers Percent
7.0.264124.32%
7.0.359222.46%
6.5.730511.57%
7.0.126410.02%
6.5.41867.06%
6.5.61294.89%
6.0.41144.32%
6.5.5742.81%
7.0732.77%
6.5.1702.66%
6.5.2291.10%
Other1596.03%

ArGoSoft (2,380 servers)

Version Number of Servers Percent
1.8 (1.8.9.3)42617.90%
1.8 (1.8.9.5)35114.75%
1.8 (1.8.9.1)30512.82%
1.8 (1.8.8.8)2249.41%
1.8 (1.8.8.7)1998.36%
1.8 (1.8.9.2)1425.97%
1.8 (1.8.9.4)723.03%
1.8 (1.8.8.9)692.90%
1.8 (1.8.8.1)441.85%
1.8 (1.8.9.0)441.85%
1.8 (1.8.6.0)431.81%
1.8 (1.8.8.2)431.81%
1.8 (1.8.5.9)301.26%
1.8 (1.8.8.3)251.05%
1.8 (1.8.7.5)241.01%
Other33914.24%

SurgeSMTP (1,766 servers)

Version Number of Servers Percent
3.9e-151629.22%
3.9c-125914.67%
3.8k4-424513.87%
3.8f3-3884.98%
3.7b8-8754.25%
3.8i3-3653.68%
3.6f5-5633.57%
3.5b3-3593.34%
3.9g2-2392.21%
3.0c2-2362.04%
3.8f2-2331.87%
3.7b6-6301.70%
3.8k2-2191.08%
Other23913.53%

Qmail Toaster (1,725 servers)

Version Number of Servers Percent
1.31,37479.65%
1.227916.17%
1.0563.25%
Other160.93%

Gordano Messaging Suite (GMS) (913 servers)

Version Number of Servers Percent
Other913100.00%

Post.Office (835 servers)

Version Number of Servers Percent
3.5.321425.63%
4.0.1748.86%
3.5.3J627.43%
3.8.3445.27%
3.6.3384.55%
4.1.0.2333.95%
3.6.2303.59%
3.9.1283.35%
3.9.2.3273.23%
3.9.2232.75%
3.1.2J232.75%
3.9.0222.63%
3.1.2212.51%
3.8.4212.51%
3.8.7.4212.51%
3.5.2141.68%
4.1131.56%
4.0.0.2111.32%
3.9.1.3111.32%
3.9.2.1111.32%
4.0.0.1111.32%
3.6.0101.20%
3.8.2101.20%
Other637.54%

InterScan VirusWall (586 servers)

Version Number of Servers Percent
Other586100.00%

Mirapoint (571 servers)

Version Number of Servers Percent
3.8.4-GA10919.09%
3.8.3-GA8815.41%
3.8.6-GA8014.01%
3.8.5-GA5810.16%
3.7.5a-GA508.76%
3.8.7a386.65%
3.8.2-GA284.90%
3.7.3a-GA244.20%
3.7.4b-GA203.50%
3.7.5-GA111.93%
4.0.5a101.75%
3.5.8-GR81.40%
3.10.1-FCS81.40%
Other396.83%

NetIQ MailMarshal (540 servers)

Version Number of Servers Percent
6.0.3.841977.59%
5.5.6.7325.93%
6.1.3.15285.19%
5.5.6.6122.22%
5.5.5.9112.04%
5.5.4.16112.04%
5.5.6.571.30%
Other203.70%

VisNetic (501 servers)

Version Number of Servers Percent
9.1.4.113727.35%
9.1.4.0356.99%
8.5.0.8316.19%
7.2.4.1285.59%
5.0.2.3265.19%
5.8.6.6254.99%
8.3.5.0224.39%
8.0.3.0224.39%
6.2.2.0203.99%
5.5.8.3193.79%
8.0.3.1173.39%
5.3.5.0152.99%
7.6.1.0142.79%
8.3.6122.40%
8.0.3122.40%
5.8.6.471.40%
7.5.3.071.40%
5.4.5.461.20%
Other469.18%

MagicMail (431 servers)

Version Number of Servers Percent
Other431100.00%

Interscan (405 servers)

Version Number of Servers Percent
3.55 (build 1016)6315.56%
3.81-Build_10225814.32%
3.8-Build_30135814.32%
3.55 (build 1029)409.88%
3.53 (build 2017)399.63%
3.53 (build 2011)256.17%
3.53 (build 1493)184.44%
3.53 (build 2013)174.20%
3.81-Build_1084143.46%
3.55 (build 1020)133.21%
3.52 (build 1375)112.72%
3.8-Build_108061.48%
3.55 (build 1018)51.23%
Other389.38%

WebSTAR V (177 servers)

Version Number of Servers Percent
5.4.15631.64%
5.3.44223.73%
5.4.04022.60%
5.3.31810.17%
5.3.2147.91%
5.3.042.26%
5.3.121.13%
Other10.56%

Neon Mail Server (174 servers)

Version Number of Servers Percent
3.1.34928.16%
3.0.73318.97%
3.0.93218.39%
3.1.22514.37%
3.1.02313.22%
3.0.642.30%
3.0.831.72%
3.1.131.72%
3.0.521.15%
Other00.00%

Mercury (166 servers)

Version Number of Servers Percent
1.487545.18%
3.325331.93%
3.21c148.43%
3.3174.22%
1.4453.01%
1.4753.01%
1.4921.20%
3.2121.20%
Other31.81%

ModusMail (114 servers)

Version Number of Servers Percent
4.35.480.03530.70%
3.2.315.01714.91%
4.35.477.01210.53%
4.3.459.097.89%
4.35.480.1176.14%
3.1.302.076.14%
4.1.361.2143.51%
4.1.361.043.51%
4.2.420.043.51%
4.2.425.421.75%
4.0.340.021.75%
3.1.293.121.75%
4.2.420.121.75%
Other76.14%

MessageWall (76 servers)

Version Number of Servers Percent
1.0.85876.32%
1.0.111621.05%
1.1.022.63%
Other00.00%

WebSTAR (74 servers)

Version Number of Servers Percent
Other74100.00%

MAILsweeper (68 servers)

Version Number of Servers Percent
4.3.20.01826.47%
4.3.19.01014.71%
4.3.17.01014.71%
4.3.14.0811.76%
4.3.1.0710.29%
4.2.10.057.35%
4.3.12.034.41%
4.3.10.022.94%
4.3.6.022.94%
4.2.1.011.47%
4.2.5.011.47%
4.1.5.011.47%
Other00.00%

OpenVMS (28 servers)

Version Number of Servers Percent
8.31346.43%
7.3828.57%
8.2414.29%
7.227.14%
6.113.57%
Other00.00%




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