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Mail (MX) Server Survey
January 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 Queried2,130,425   100.0%
Number of Servers that didn't respond340,67815.99%
    Server didn't open socket328,72815.43%
    Server didn't provide banner11,9500.56%
Server provided banner1,789,74784.01%
Server banner identifies software in use978,17445.91%

As indicated by the above table, of the 2,130,425 servers queried, only 978,174 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
Exim372,29538.06%
Postfix211,92421.67%
Microsoft155,10015.86%
Sendmail143,77314.70%
MailEnable31,1183.18%
MDaemon21,9572.24%
IMail11,4911.17%
Lotus Domino5,0840.52%
WinWebMail4,6860.48%
CommuniGate Pro3,6180.37%
Kerio3,3870.35%
XMail2,5120.26%
Merak2,2260.23%
Qmail Toaster1,7350.18%
SurgeSMTP1,3020.13%
ArGoSoft1,2710.13%
GroupWise1,1400.12%
Trend Micro7350.08%
Gordano Messaging Suite (GMS)5040.05%
Post.Office4790.05%
MagicMail4510.05%
Mirapoint3400.03%
VisNetic2550.03%
InterScan VirusWall2440.02%
NetIQ MailMarshal1150.01%
Interscan970.01%
Mercury830.01%
WebSTAR V670.01%
Neon Mail Server560.01%
ModusMail290.00%
MessageWall280.00%
WebSTAR260.00%
OpenVMS250.00%
MAILsweeper150.00%
OpenSMTPD60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (372,295 servers)

Version Number of Servers Percent
4.69320,03785.96%
4.6714,5083.90%
4.6311,7613.16%
4.728,7832.36%
4.715,1061.37%
Other12,1003.25%

Postfix (211,924 servers)

Version Number of Servers Percent
Other211,924100.00%

Microsoft (155,100 servers)

Version Number of Servers Percent
6.0.3790.4675106,22068.48%
6.0.3790.395933,32521.49%
6.0.3790.18308,3155.36%
5.0.2195.73812,2751.47%
5.0.2195.67131,8011.16%
Other3,1642.04%

Sendmail (143,773 servers)

Version Number of Servers Percent
8.13.828,41619.76%
8.13.127,27518.97%
8.14.416,14511.23%
8.14.314,61810.17%
8.12.11.200603088,5505.95%
8.12.11.200606148,5355.94%
8.13.6.200606145,5413.85%
8.14.24,4033.06%
8.12.104,2522.96%
8.11.64,2312.94%
8.13.63,4862.42%
8.14.13,2612.27%
8.12.112,4731.72%
8.13.72,3871.66%
8.13.42,2991.60%
8.12.82,0121.40%
Other5,8894.10%

MailEnable (31,118 servers)

Version Number of Servers Percent
1.986--10,47633.67%
1.981--2,7188.73%
1.983--1,7265.55%
3.62--1,1483.69%
0-3.63-9453.04%
4.23--8182.63%
4.26--8172.63%
4.22--7222.32%
0-4.26-6712.16%
1.96--4871.57%
1.95--4681.50%
4.26--4.264651.49%
0-1.87-4461.43%
0-2.53-4311.39%
--3.633831.23%
0-4.23-3731.20%
4.14--3541.14%
1.9--3531.13%
4.17--3251.04%
0-3.61-3161.02%
Other6,67621.45%

MDaemon (21,957 servers)

Version Number of Servers Percent
11.0.35,98527.26%
10.1.21,5356.99%
10.0.01,2075.50%
11.0.01,0784.91%
10.1.11,0204.65%
9.6.17713.51%
9.6.67283.32%
10.1.06252.85%
9.6.55052.30%
10.0.55052.30%
9.5.24902.23%
11.0.24652.12%
10.0.24422.01%
10.0.44071.85%
9.5.14001.82%
9.6.23931.79%
8.1.33741.70%
9.6.43731.70%
9.5.63691.68%
11.0.13461.58%
9.0.43361.53%
9.6.32361.07%
6.8.52241.02%
9.5.52221.01%
Other2,92113.30%

IMail (11,491 servers)

Version Number of Servers Percent
8.222,23319.43%
11.021,15610.06%
8.159228.02%
9.238097.04%
11.017426.46%
8.055034.38%
9.204984.33%
9.104844.21%
11.04273.72%
10.024143.60%
11.033643.17%
7.073312.88%
9.213272.85%
7.152782.42%
8.002532.20%
6.062291.99%
10.011701.48%
8.041631.42%
8.101261.10%
Other1,0629.24%

Lotus Domino (5,084 servers)

Version Number of Servers Percent
8.5.253410.50%
8.5.152910.41%
8.53446.77%
7.0.23216.31%
8.5.1FP32033.99%
7.0.31973.87%
7.0.11823.58%
8.0.21713.36%
8.0.11713.36%
6.5.11472.89%
6.5.41462.87%
8.5.1FP21322.60%
6.5.31322.60%
7.0.3FP11182.32%
8.5.1FP41152.26%
7.01082.12%
8.01072.10%
6.5.51062.08%
7.0.2FP2991.95%
6.5821.61%
8.5.1FP1791.55%
8.5FP1711.40%
5.0.11621.22%
Other92818.25%

WinWebMail (4,686 servers)

Version Number of Servers Percent
3.8.0.11,05822.58%
3.7.6.173815.75%
3.7.3.155711.89%
3.7.7.354211.57%
3.8.1.146910.01%
3.8.1.33276.98%
3.7.1.12455.23%
3.7.5.11673.56%
3.7.7.11453.09%
3.6.3.11262.69%
3.7.0.51162.48%
3.7.0.3891.90%
3.7.0.7771.64%
Other300.64%

CommuniGate Pro (3,618 servers)

Version Number of Servers Percent
5.1.162346.47%
4.1.81945.36%
5.3.101925.31%
5.2.161624.48%
5.3.81594.39%
5.3.91484.09%
4.2.101193.29%
5.2.191032.85%
5.2.20952.63%
5.1.12892.46%
5.2.3842.32%
5.3.5812.24%
5.3.7792.18%
5.2.14772.13%
5.2.12762.10%
5.0.14711.96%
5.3.2651.80%
5.1.13631.74%
5.2.8591.63%
5.2.13541.49%
5.2.10531.46%
5.2.18491.35%
5.1.14441.22%
5.0.9411.13%
5.2.0391.08%
5.2.11381.05%
5.3.4371.02%
Other1,11330.76%

Kerio (3,387 servers)

Version Number of Servers Percent
6.7.347313.97%
6.6.237911.19%
6.7.036110.66%
6.7.22758.12%
6.5.02306.79%
6.5.21915.64%
6.7.11845.43%
6.4.11715.05%
6.3.11634.81%
6.5.11143.37%
6.4.01143.37%
6.6.01143.37%
6.6.1872.57%
6.4.2862.54%
6.3.0682.01%
6.1.3371.09%
Other34010.04%

XMail (2,512 servers)

Version Number of Servers Percent
1.2258923.45%
1.2558223.17%
1.2633913.50%
1.2431012.34%
1.272379.43%
1.211174.66%
1.23652.59%
1.20622.47%
1.17501.99%
1.12491.95%
Other1124.46%

Merak (2,226 servers)

Version Number of Servers Percent
8.0.391441.06%
8.9.12169.70%
8.5.01536.87%
7.5.21074.81%
7.4.51034.63%
7.6.4904.04%
8.3.8833.73%
8.2.13452.02%
9.0.0331.48%
7.4.2331.48%
8.3.15301.35%
7.2.0291.30%
7.6.1291.30%
8.9.0271.21%
8.2.4251.12%
Other30913.88%

Qmail Toaster (1,735 servers)

Version Number of Servers Percent
1.31,59691.99%
1.2995.71%
1.0291.67%
Other110.63%

SurgeSMTP (1,302 servers)

Version Number of Servers Percent
5.0e4-421116.21%
4.2d4-414911.44%
3.9e-11259.60%
5.1c-1634.84%
3.8k4-4584.45%
4.3g2-2554.22%
5.0e3-3544.15%
4.0u4-4523.99%
4.3e-1443.38%
4.3g4-4433.30%
4.2d2-2413.15%
3.8i3-3312.38%
3.7b8-8262.00%
3.8f3-3241.84%
4.2a3-3221.69%
3.9c-1201.54%
3.6f5-5201.54%
3.9g2-2141.08%
3.9h-18141.08%
Other23618.13%

ArGoSoft (1,271 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)27121.32%
1.8 (1.8.9.5)19715.50%
1.8 (1.8.9.3)16312.82%
1.8 (1.8.9.1)1219.52%
1.8 (1.8.8.8)1007.87%
1.8 (1.8.8.7)735.74%
1.8 (1.8.9.2)544.25%
1.8 (1.8.9.4)393.07%
1.8 (1.8.8.1)251.97%
1.8 (1.8.8.9)231.81%
1.8 (1.8.9.0)171.34%
1.8 (1.8.6.0)171.34%
1.8 (1.8.8.2)141.10%
Other15712.35%

GroupWise (1,140 servers)

Version Number of Servers Percent
7.0.329425.79%
8.0.214212.46%
6.5.713111.49%
7.0.21079.39%
8.0.1958.33%
7.0.1595.18%
6.5.4575.00%
6.5.6484.21%
7.0.4342.98%
6.5.1332.89%
8.0.0302.63%
6.0.4302.63%
7.0171.49%
6.5.5161.40%
Other474.12%

Trend Micro (735 servers)

Version Number of Servers Percent
5.731442.72%
5.520327.62%
5.1812316.73%
7.0638.57%
7.1141.90%
781.09%
Other101.36%

Gordano Messaging Suite (GMS) (504 servers)

Version Number of Servers Percent
Other504100.00%

Post.Office (479 servers)

Version Number of Servers Percent
3.5.38016.70%
4.1.0.25110.65%
4.0.1428.77%
3.5.3J265.43%
4.1.1255.22%
3.8.3224.59%
4.1.0.4153.13%
3.9.2.3142.92%
3.1.2J142.92%
3.9.2132.71%
3.9.1132.71%
4.1.2.2132.71%
3.1.2112.30%
4.0.1.1102.09%
3.6.2102.09%
3.8.7.4102.09%
4.1.0.391.88%
4.0.0.291.88%
3.6.381.67%
4.171.46%
3.9.2.171.46%
3.5.271.46%
3.9.1.361.25%
3.9.051.04%
3.9.1.251.04%
4.0.0.151.04%
Other428.77%

MagicMail (451 servers)

Version Number of Servers Percent
Other451100.00%

Mirapoint (340 servers)

Version Number of Servers Percent
3.8.4-GA319.12%
3.10.8-GA298.53%
3.10.5-GA288.24%
3.8.3-GA277.94%
3.10.9-GA236.76%
3.10.7-GA226.47%
4.1.9-GA185.29%
4.1.3-GA175.00%
3.10.10a-GA133.82%
3.10.6-GA133.82%
4.1.8-GA133.82%
3.10.4-GA113.24%
3.10.3-GA102.94%
4.1.10-GA102.94%
3.8.5-GA92.65%
4.1.4-GA82.35%
3.8.7a82.35%
3.8.6-GA72.06%
3.8.2-GA61.76%
3.7.3a-GA51.47%
3.7.5a-GA51.47%
4.0.5a41.18%
4.1.5-GA41.18%
Other195.59%

VisNetic (255 servers)

Version Number of Servers Percent
9.3.2.09035.29%
9.1.4.13915.29%
5.8.6.6124.71%
8.5.0.8124.71%
5.5.8.3103.92%
8.0.3.183.14%
6.2.2.072.75%
8.0.372.75%
7.6.1.072.75%
8.3.5.062.35%
8.0.3.062.35%
5.3.5.051.96%
9.1.4.051.96%
7.2.4.151.96%
5.4.5.451.96%
8.3.641.57%
5.0.2.341.57%
7.5.3.031.18%
5.0.2.131.18%
Other176.67%

InterScan VirusWall (244 servers)

Version Number of Servers Percent
Other244100.00%

NetIQ MailMarshal (115 servers)

Version Number of Servers Percent
6.0.3.88271.30%
5.5.6.797.83%
6.1.3.1586.96%
5.5.6.643.48%
5.5.4.1632.61%
5.5.6.521.74%
Other76.09%

Interscan (97 servers)

Version Number of Servers Percent
3.81-Build_10221616.49%
3.55 (build 1016)1515.46%
3.55 (build 1029)1111.34%
3.53 (build 2017)1010.31%
3.8-Build_301377.22%
3.81-Build_108477.22%
3.53 (build 1493)44.12%
3.55 (build 1020)44.12%
3.52 (build 1375)44.12%
3.53 (build 2011)33.09%
3.53 (build 1494)22.06%
3.53 (build 2013)22.06%
3.8-Build_108022.06%
3.81-Build_105511.03%
3.61-Build_101411.03%
3.51 (build 1321)11.03%
3.8-Build_306511.03%
3.6-Build_301311.03%
3.6-Build_127311.03%
3.6-Build_124611.03%
3.81-Build_103211.03%
3.8-Build_304511.03%
3.6-Build_120711.03%
Other00.00%

Mercury (83 servers)

Version Number of Servers Percent
1.484756.63%
3.321922.89%
3.21c78.43%
3.01a22.41%
1.4722.41%
3.3022.41%
3.2111.20%
1.4411.20%
3.3111.20%
1.4911.20%
Other00.00%

WebSTAR V (67 servers)

Version Number of Servers Percent
5.4.12638.81%
5.4.01522.39%
5.3.41319.40%
5.3.268.96%
5.3.357.46%
5.3.011.49%
5.3.111.49%
Other00.00%

Neon Mail Server (56 servers)

Version Number of Servers Percent
3.1.31425.00%
3.0.71425.00%
3.0.9814.29%
3.1.4610.71%
3.1.247.14%
3.1.047.14%
3.1.535.36%
3.1.123.57%
3.0.611.79%
Other00.00%

ModusMail (29 servers)

Version Number of Servers Percent
4.35.477.0827.59%
4.2.420.0517.24%
4.35.480.0310.34%
4.1.361.2126.90%
3.1.293.126.90%
3.1.302.026.90%
4.35.480.1126.90%
4.2.425.2213.45%
3.2.315.013.45%
4.0.340.313.45%
4.3.459.013.45%
4.35.477.813.45%
Other00.00%

MessageWall (28 servers)

Version Number of Servers Percent
1.0.82692.86%
1.0.613.57%
1.1.013.57%
Other00.00%

WebSTAR (26 servers)

Version Number of Servers Percent
Other26100.00%

OpenVMS (25 servers)

Version Number of Servers Percent
8.31248.00%
7.3728.00%
8.428.00%
8.228.00%
6.114.00%
7.214.00%
Other00.00%

MAILsweeper (15 servers)

Version Number of Servers Percent
4.3.17.0426.67%
4.3.14.0426.67%
4.3.20.0213.33%
4.3.19.016.67%
4.3.10.016.67%
4.3.1.016.67%
4.3.6.016.67%
4.2.5.016.67%
Other00.00%

OpenSMTPD (6 servers)

Version Number of Servers Percent
Other6100.00%




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