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Mail (MX) Server Survey
December 1st, 2011

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 Queried2,329,809   100.0%
Number of Servers that didn't respond383,45416.46%
    Server didn't open socket371,36215.94%
    Server didn't provide banner12,0920.52%
Server provided banner1,946,35583.54%
Server banner identifies software in use1,060,98345.54%

As indicated by the above table, of the 2,329,809 servers queried, only 1,060,983 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
Exim454,80442.87%
Postfix248,37523.41%
Sendmail133,15512.55%
Microsoft133,01812.54%
MailEnable33,2973.14%
MDaemon21,9092.06%
IMail9,6790.91%
Lotus Domino5,0540.48%
WinWebMail4,1440.39%
CommuniGate Pro3,4920.33%
XMail2,4230.23%
Kerio2,2790.21%
Qmail Toaster1,7180.16%
Merak1,7130.16%
SurgeSMTP1,2690.12%
ArGoSoft1,0470.10%
GroupWise8300.08%
Trend Micro5060.05%
Post.Office4560.04%
Gordano Messaging Suite (GMS)4360.04%
MagicMail3640.03%
Mirapoint2470.02%
VisNetic1920.02%
InterScan VirusWall1790.02%
NetIQ MailMarshal760.01%
Interscan720.01%
Mercury580.01%
Neon Mail Server460.00%
WebSTAR V400.00%
OpenVMS230.00%
MessageWall220.00%
WebSTAR170.00%
ModusMail170.00%
OpenSMTPD160.00%
MAILsweeper100.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (454,804 servers)

Version Number of Servers Percent
4.69360,10679.18%
4.7635,7997.87%
4.7220,6804.55%
4.679,0131.98%
4.776,6001.45%
4.635,8651.29%
Other16,7413.68%

Postfix (248,375 servers)

Version Number of Servers Percent
Other248,375100.00%

Sendmail (133,155 servers)

Version Number of Servers Percent
8.13.832,04524.07%
8.13.122,96817.25%
8.14.418,72214.06%
8.14.317,95213.48%
8.12.11.200603085,9024.43%
8.13.6.200606144,5763.44%
8.14.24,2053.16%
8.11.63,1922.40%
8.12.103,0742.31%
8.13.62,7172.04%
8.14.12,6131.96%
8.12.11.200606142,2231.67%
8.14.52,0321.53%
8.13.71,9571.47%
8.12.111,8111.36%
8.12.81,5381.16%
8.13.41,4711.10%
Other4,1573.12%

Microsoft (133,018 servers)

Version Number of Servers Percent
6.0.3790.4675103,01977.45%
6.0.3790.395918,74814.09%
6.0.3790.18305,2153.92%
5.0.2195.73811,6561.24%
Other4,3803.29%

MailEnable (33,297 servers)

Version Number of Servers Percent
1.986--9,66129.01%
4.26--2,6547.97%
1.981--1,9465.84%
5.10--1,4914.48%
1.983--1,2343.71%
0-3.63-8442.53%
3.62--8242.47%
5.51--8042.41%
5.11--7372.21%
4.22--5201.56%
0-5.51-5171.55%
0-4.26-5151.55%
4.23--4641.39%
0-1.87-4191.26%
0-2.53-3781.14%
--3.633531.06%
1.95--3521.06%
1.96--3511.05%
Other9,23327.73%

MDaemon (21,909 servers)

Version Number of Servers Percent
11.0.32,95813.50%
12.5.02,1799.95%
12.0.41,5667.15%
12.0.31,4276.51%
11.0.01,2475.69%
10.1.21,0394.74%
10.0.01,0064.59%
10.1.17823.57%
9.6.16092.78%
9.6.65732.62%
10.1.05242.39%
12.0.14422.02%
9.5.23941.80%
9.6.53781.73%
10.0.53731.70%
10.0.23521.61%
12.0.03481.59%
9.6.23461.58%
9.5.13371.54%
9.5.63161.44%
9.6.42971.36%
8.1.32831.29%
10.0.42761.26%
9.0.42661.21%
12.0.22391.09%
11.0.22251.03%
Other3,12714.27%

IMail (9,679 servers)

Version Number of Servers Percent
8.221,80518.65%
11.51,43614.84%
8.156616.83%
11.035846.03%
9.235645.83%
11.014724.88%
8.053984.11%
11.023723.84%
9.203463.57%
9.103283.39%
10.022993.09%
11.02943.04%
7.072542.62%
7.152212.28%
8.001881.94%
6.061751.81%
10.011471.52%
9.211211.25%
8.041081.12%
Other9069.36%

Lotus Domino (5,054 servers)

Version Number of Servers Percent
8.5.255310.94%
8.5.2FP24468.82%
8.5.13406.73%
8.5.32735.40%
8.5.2FP32715.36%
7.0.22685.30%
8.52334.61%
8.5.2FP12154.25%
7.0.31523.01%
8.0.11232.43%
8.0.21222.41%
8.5.1FP51222.41%
7.0.11202.37%
6.5.41092.16%
6.5.11042.06%
8.0901.78%
8.5.1FP3901.78%
6.5.3891.76%
7.0831.64%
6.5.5731.44%
7.0.2FP2721.42%
7.0.3FP1681.35%
6.5661.31%
8.5.1FP4631.25%
8.5.1FP2551.09%
Other85416.90%

WinWebMail (4,144 servers)

Version Number of Servers Percent
3.8.1.31,00824.32%
3.8.0.170316.96%
3.7.6.156013.51%
3.7.7.33598.66%
3.8.1.13568.59%
3.7.3.13548.54%
3.7.1.11784.30%
3.7.5.11273.06%
3.7.7.11062.56%
3.6.3.1872.10%
3.7.0.5761.83%
3.8.1.5751.81%
3.7.0.3721.74%
3.7.0.7571.38%
Other260.63%

CommuniGate Pro (3,492 servers)

Version Number of Servers Percent
5.1.162717.76%
5.4.11975.64%
4.1.81795.13%
5.3.131424.07%
5.2.201183.38%
5.4.21163.32%
5.4.0932.66%
5.2.16932.66%
4.2.10922.63%
5.3.8902.58%
5.3.12752.15%
5.2.19742.12%
5.2.3722.06%
5.1.12722.06%
5.0.14712.03%
5.2.14671.92%
5.3.14661.89%
5.3.10631.80%
5.4601.72%
5.3.9571.63%
5.1.13531.52%
5.2.12511.46%
5.2.8491.40%
5.3.11461.32%
5.2.13431.23%
5.3.7381.09%
5.3.2371.06%
5.2.0371.06%
5.1.14351.00%
Other1,03529.64%

XMail (2,423 servers)

Version Number of Servers Percent
1.2258224.02%
1.2548319.93%
1.2742117.38%
1.2631012.79%
1.2424910.28%
1.211044.29%
1.23592.43%
1.20552.27%
1.17391.61%
1.12341.40%
Other873.59%

Kerio (2,279 servers)

Version Number of Servers Percent
6.7.332914.44%
6.6.224010.53%
6.7.02028.86%
6.5.01566.85%
6.7.21546.76%
6.5.21476.45%
6.4.11205.27%
6.7.11175.13%
6.3.11094.78%
6.4.0903.95%
6.6.0843.69%
6.5.1763.33%
6.6.1703.07%
6.4.2552.41%
6.3.0381.67%
6.1.3261.14%
6.2.2261.14%
6.2.0241.05%
6.1.0231.01%
Other1938.47%

Qmail Toaster (1,718 servers)

Version Number of Servers Percent
1.31,61694.06%
1.2714.13%
1.0191.11%
Other120.70%

Merak (1,713 servers)

Version Number of Servers Percent
8.0.370941.39%
8.9.117410.16%
8.5.01287.47%
7.5.2754.38%
7.6.4724.20%
8.3.8714.14%
7.4.5613.56%
9.0.0291.69%
7.4.2271.58%
7.2.0231.34%
8.3.15231.34%
7.6.1221.28%
8.2.4221.28%
7.0.1211.23%
8.9.0201.17%
6.2.1191.11%
Other21712.67%

SurgeSMTP (1,269 servers)

Version Number of Servers Percent
5.3h2-231724.98%
5.2a-118814.81%
3.9e-1947.41%
4.2d4-4876.86%
5.0e4-4463.62%
4.0u4-4453.55%
5.3h-1433.39%
3.8k4-4433.39%
3.8i3-3272.13%
4.2d2-2251.97%
4.3g2-2231.81%
5.0e3-3171.34%
4.3e-1161.26%
3.6f5-5161.26%
4.2a3-3151.18%
3.9h-18151.18%
3.9c-1151.18%
5.1c2-2151.18%
3.7b8-8141.10%
4.3g4-4141.10%
Other19415.29%

ArGoSoft (1,047 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)23922.83%
1.8 (1.8.9.5)17216.43%
1.8 (1.8.9.3)13212.61%
1.8 (1.8.9.1)999.46%
1.8 (1.8.8.8)757.16%
1.8 (1.8.8.7)585.54%
1.8 (1.8.9.2)434.11%
1.8 (1.8.9.4)272.58%
1.8 (1.8.6.0)181.72%
1.8 (1.8.8.1)161.53%
1.8 (1.8.8.9)151.43%
1.8 (1.8.9.0)151.43%
1.8 (1.8.8.2)111.05%
Other12712.13%

GroupWise (830 servers)

Version Number of Servers Percent
7.0.318322.05%
8.0.216519.88%
6.5.79311.20%
7.0.2637.59%
7.0.4566.75%
8.0.1546.51%
6.5.4323.86%
7.0.1303.61%
6.5.6263.13%
6.0.4253.01%
6.5.1202.41%
8.0.0192.29%
6.5.5161.93%
7.0131.57%
Other354.22%

Trend Micro (506 servers)

Version Number of Servers Percent
5.721041.50%
5.512624.90%
5.188917.59%
7.0509.88%
7.1173.36%
Other142.77%

Post.Office (456 servers)

Version Number of Servers Percent
3.5.37516.45%
4.1.0.25111.18%
4.0.1378.11%
4.1.2.4306.58%
4.1.1224.82%
3.5.3J214.61%
3.9.2.3183.95%
3.8.3143.07%
3.9.2132.85%
3.1.2J112.41%
4.2102.19%
3.1.2102.19%
4.1.0.3102.19%
4.1.0.491.97%
4.0.1.191.97%
3.6.291.97%
4.1.2.381.75%
3.8.7.481.75%
4.0.0.271.54%
3.9.2.171.54%
4.1.2.271.54%
4.0.0.161.32%
3.9.161.32%
4.161.32%
3.9.1.351.10%
3.9.1.251.10%
3.5.151.10%
Other378.11%

Gordano Messaging Suite (GMS) (436 servers)

Version Number of Servers Percent
Other436100.00%

MagicMail (364 servers)

Version Number of Servers Percent
Other364100.00%

Mirapoint (247 servers)

Version Number of Servers Percent
4.2.3-GA2811.34%
3.10.10a-GA249.72%
3.8.4-GA228.91%
3.10.5-GA187.29%
3.8.3-GA176.88%
4.1.10-GA145.67%
3.10.8-GA135.26%
3.10.9-GA135.26%
4.1.3-GA114.45%
3.10.3-GA104.05%
3.10.7-GA93.64%
4.1.9-GA93.64%
4.1.8-GA62.43%
3.8.7a62.43%
4.1.4-GA62.43%
3.8.2-GA62.43%
3.8.5-GA52.02%
3.7.5a-GA31.21%
3.8.6-GA31.21%
4.2.4-GA31.21%
4.1.5-GA31.21%
Other187.29%

VisNetic (192 servers)

Version Number of Servers Percent
9.3.2.05830.21%
9.1.4.12714.06%
5.8.6.6136.77%
8.5.0.8105.21%
5.5.8.394.69%
8.0.3.173.65%
7.6.1.063.12%
8.0.363.12%
5.0.2.363.12%
8.0.3.052.60%
8.3.5.052.60%
5.3.5.042.08%
9.1.4.042.08%
5.0.2.142.08%
7.2.4.142.08%
6.2.2.031.56%
7.5.3.021.04%
8.3.0.121.04%
5.4.5.421.04%
7-6-1-021.04%
Other136.77%

InterScan VirusWall (179 servers)

Version Number of Servers Percent
Other179100.00%

NetIQ MailMarshal (76 servers)

Version Number of Servers Percent
6.0.3.85268.42%
5.5.6.779.21%
6.1.3.1567.89%
5.5.4.1633.95%
5.5.6.522.63%
5.5.6.622.63%
5.5.5.911.32%
5.5.4.1711.32%
5.5.3.1711.32%
5.5.5.611.32%
Other00.00%

Interscan (72 servers)

Version Number of Servers Percent
3.55 (build 1016)1622.22%
3.55 (build 1029)912.50%
3.81-Build_1022811.11%
3.81-Build_108468.33%
3.53 (build 2017)56.94%
3.8-Build_301356.94%
3.55 (build 1020)45.56%
3.53 (build 1493)45.56%
3.53 (build 2011)34.17%
3.53 (build 2013)22.78%
3.8-Build_108022.78%
3.52 (build 1375)22.78%
3.5 (build 1294)11.39%
3.51 (build 1321)11.39%
3.51 (build 1337)11.39%
3.81-Build_105511.39%
3.6-Build_124611.39%
3.8-Build_304511.39%
Other00.00%

Mercury (58 servers)

Version Number of Servers Percent
1.482950.00%
3.321627.59%
3.21c35.17%
3.2123.45%
3.01a23.45%
1.4723.45%
1.4411.72%
3.3111.72%
4.x11.72%
3.3011.72%
Other00.00%

Neon Mail Server (46 servers)

Version Number of Servers Percent
3.1.31328.26%
3.0.71021.74%
3.0.9613.04%
3.1.4510.87%
3.1.0510.87%
3.1.236.52%
3.0.624.35%
3.1.112.17%
3.1.512.17%
Other00.00%

WebSTAR V (40 servers)

Version Number of Servers Percent
5.4.11947.50%
5.4.0717.50%
5.3.4615.00%
5.3.3512.50%
5.3.225.00%
5.3.012.50%
Other00.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.31043.48%
7.3730.43%
8.4417.39%
6.114.35%
8.214.35%
Other00.00%

MessageWall (22 servers)

Version Number of Servers Percent
1.0.82195.45%
1.0.614.55%
Other00.00%

WebSTAR (17 servers)

Version Number of Servers Percent
Other17100.00%

ModusMail (17 servers)

Version Number of Servers Percent
4.35.477.0847.06%
4.35.480.0317.65%
4.1.361.2115.88%
3.2.315.015.88%
4.0.340.315.88%
4.3.459.015.88%
4.35.477.815.88%
3.1.302.015.88%
Other00.00%

OpenSMTPD (16 servers)

Version Number of Servers Percent
Other16100.00%

MAILsweeper (10 servers)

Version Number of Servers Percent
4.3.17.0330.00%
4.3.20.0220.00%
4.3.19.0220.00%
4.3.1.0110.00%
4.3.14.0110.00%
4.3.6.0110.00%
Other00.00%




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