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Mail (MX) Server Survey
July 1st, 2013

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 Queried2,465,146   100.0%
Number of Servers that didn't respond435,45117.66%
    Server didn't open socket423,91517.20%
    Server didn't provide banner11,5360.47%
Server provided banner2,029,69582.34%
Server banner identifies software in use1,117,73445.34%

As indicated by the above table, of the 2,465,146 servers queried, only 1,117,734 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
Exim545,79448.83%
Postfix298,32226.69%
Sendmail112,88010.10%
Microsoft80,0707.16%
MailEnable33,1082.96%
MDaemon20,6001.84%
IMail6,5850.59%
Lotus Domino4,2720.38%
CommuniGate Pro3,0730.27%
WinWebMail3,0370.27%
XMail2,0840.19%
Qmail Toaster1,5690.14%
Kerio1,3660.12%
Merak1,0930.10%
SurgeSMTP1,0090.09%
ArGoSoft6390.06%
GroupWise4110.04%
Post.Office3420.03%
MagicMail3070.03%
Gordano Messaging Suite (GMS)2960.03%
Trend Micro2780.02%
Mirapoint1180.01%
VisNetic1130.01%
InterScan VirusWall1120.01%
Mercury470.00%
Interscan380.00%
OpenSMTPD380.00%
NetIQ MailMarshal240.00%
WebSTAR V240.00%
Neon Mail Server200.00%
OpenVMS190.00%
MessageWall180.00%
WebSTAR130.00%
ModusMail110.00%
MAILsweeper40.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (545,794 servers)

Version Number of Servers Percent
4.80411,94875.48%
4.80.137,6286.89%
4.7222,7354.17%
4.6919,8443.64%
4.7615,6552.87%
4.7715,3852.82%
Other22,5994.14%

Postfix (298,322 servers)

Version Number of Servers Percent
Other298,322100.00%

Sendmail (112,880 servers)

Version Number of Servers Percent
8.13.829,67826.29%
8.13.115,96114.14%
8.14.315,32713.58%
8.14.513,48211.94%
8.14.413,26911.75%
8.12.11.200603084,0893.62%
8.13.6.200606143,2372.87%
8.14.22,8892.56%
8.11.61,8641.65%
8.12.101,6761.48%
8.14.11,5801.40%
8.13.61,3121.16%
8.13.71,2141.08%
Other7,3026.47%

Microsoft (80,070 servers)

Version Number of Servers Percent
6.0.3790.467564,74280.86%
6.0.3790.39597,9189.89%
6.0.3790.18302,1292.66%
7.5.7601.175142,0222.53%
5.0.2195.73818071.01%
Other2,4523.06%

MailEnable (33,108 servers)

Version Number of Servers Percent
1.986--5,44316.44%
5.10--2,3167.00%
6.5--2,0836.29%
4.26--1,7645.33%
6.0--1,3564.10%
1.981--1,0053.04%
7.06--5941.79%
6.70--5601.69%
3.62--5551.68%
1.983--5471.65%
6.57--5351.62%
5.51--5051.53%
7.0--4861.47%
6.03--4801.45%
0-6.83-4771.44%
6.60--4231.28%
5.11--3661.11%
0-3.65-3641.10%
0-3.63-3321.00%
Other12,91739.01%

MDaemon (20,600 servers)

Version Number of Servers Percent
13.0.53,15915.33%
13.0.41,8859.15%
11.0.31,6167.84%
13.0.31,2676.15%
11.0.01,2185.91%
10.0.07333.56%
12.5.66863.33%
13.0.26062.94%
10.1.26002.91%
10.1.15782.81%
9.6.14382.13%
9.6.63961.92%
12.5.43761.83%
10.1.03711.80%
9.6.22861.39%
12.5.82761.34%
9.5.22721.32%
12.0.32571.25%
9.6.52291.11%
10.0.22281.11%
10.0.52231.08%
12.5.32231.08%
9.5.12201.07%
9.5.62121.03%
Other4,24520.61%

IMail (6,585 servers)

Version Number of Servers Percent
8.221,11516.93%
12.2.0.23581912.44%
11.55077.70%
12.3.0.1004516.85%
9.233915.94%
8.153825.80%
11.033475.27%
8.052553.87%
12.2.0.1692343.55%
10.022123.22%
12.1.0.2701952.96%
11.011482.25%
7.071432.17%
6.061201.82%
7.151191.81%
8.001081.64%
10.01971.47%
11.0911.38%
11.02861.31%
9.21661.00%
Other69910.62%

Lotus Domino (4,272 servers)

Version Number of Servers Percent
8.5.373417.18%
8.5.3FP33247.58%
8.5.3FP22395.59%
8.5.22345.48%
8.5.3FP11834.28%
8.5.2FP21814.24%
8.5.11764.12%
7.0.21633.82%
8.51403.28%
8.5.2FP31283.00%
8.5.3FP41272.97%
8.5.2FP4992.32%
7.0.3922.15%
8.5.1FP5781.83%
8.0.2711.66%
7.0701.64%
8.0.1701.64%
8.5.2FP1681.59%
7.0.1681.59%
6.5.1661.54%
6.5.4621.45%
6.5.3611.43%
6.5.5531.24%
8.0471.10%
6.5471.10%
Other69116.18%

CommuniGate Pro (3,073 servers)

Version Number of Servers Percent
5.1.162869.31%
6.0.51254.07%
4.1.81133.68%
5.2.201043.38%
6.0.41003.25%
6.0.1872.83%
5.4.8852.77%
5.4.4842.73%
5.3.13802.60%
5.4.6792.57%
5.3.15762.47%
4.2.10722.34%
5.4.10642.08%
5.4.1611.99%
5.1.12581.89%
5.2.19571.85%
5.4.5571.85%
5.0.14551.79%
5.2.3541.76%
5.2.16531.72%
5.4.7501.63%
5.4.2451.46%
5.4.3431.40%
5.4.9421.37%
5.2.14381.24%
5.4.0371.20%
5.2.12321.04%
Other1,03633.71%

WinWebMail (3,037 servers)

Version Number of Servers Percent
3.8.1.359019.43%
3.8.0.136111.89%
3.7.6.12999.85%
3.8.1.52588.50%
3.8.1.12056.75%
3.7.3.11996.55%
3.8.5.11946.39%
3.7.7.31825.99%
3.8.2.11775.83%
3.7.1.11033.39%
3.8.3.1953.13%
3.7.5.1782.57%
3.8.3.3752.47%
3.6.3.1441.45%
3.7.0.3431.42%
3.7.0.5381.25%
3.7.7.1371.22%
3.7.0.7311.02%
Other280.92%

XMail (2,084 servers)

Version Number of Servers Percent
1.2763330.37%
1.2251624.76%
1.2531715.21%
1.2621910.51%
1.241436.86%
1.21683.26%
1.23432.06%
1.20321.54%
1.17311.49%
Other823.93%

Qmail Toaster (1,569 servers)

Version Number of Servers Percent
1.31,48894.84%
1.2442.80%
Other372.36%

Kerio (1,366 servers)

Version Number of Servers Percent
6.7.322716.62%
6.6.21369.96%
6.7.01329.66%
6.5.01067.76%
6.5.2987.17%
6.7.2826.00%
6.4.1755.49%
6.7.1705.12%
6.3.1554.03%
6.4.0503.66%
6.6.1493.59%
6.5.1463.37%
6.6.0453.29%
6.3.0282.05%
6.4.2271.98%
6.0.10181.32%
Other1228.93%

Merak (1,093 servers)

Version Number of Servers Percent
8.0.343139.43%
8.9.112911.80%
8.5.0666.04%
8.3.8524.76%
7.5.2494.48%
7.4.5444.03%
7.6.4423.84%
7.0.1242.20%
7.6.1191.74%
7.4.2191.74%
9.0.0181.65%
7.2.0161.46%
8.3.15121.10%
8.9.0121.10%
6.2.1121.10%
8.2.4111.01%
Other13712.53%

SurgeSMTP (1,009 servers)

Version Number of Servers Percent
6.3c2-233032.71%
5.3h2-2757.43%
6.1c-1737.23%
5.2a-1676.64%
3.9e-1434.26%
6.0a5-5292.87%
3.8k4-4232.28%
4.0u4-4232.28%
6.0a4-4212.08%
4.2d2-2181.78%
6.4a-1161.59%
5.0e4-4151.49%
4.3g2-2141.39%
3.8i3-3131.29%
6.3d-72111.09%
4.2d4-4111.09%
Other22722.50%

ArGoSoft (639 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)16425.67%
1.8 (1.8.9.5)8713.62%
1.8 (1.8.9.3)8112.68%
1.8 (1.8.9.1)7211.27%
1.8 (1.8.8.7)446.89%
1.8 (1.8.8.8)375.79%
1.8 (1.8.9.2)233.60%
1.8 (1.8.9.4)182.82%
1.8 (1.8.8.9)121.88%
1.8 (1.8.6.0)101.56%
1.8 (1.8.7.3)71.10%
Other8413.15%

GroupWise (411 servers)

Version Number of Servers Percent
7.0.37418.00%
8.0.26215.09%
6.5.74611.19%
7.0.4338.03%
7.0.2245.84%
8.0.3204.87%
6.5.4204.87%
6.5.6184.38%
6.0.4143.41%
7.0.1133.16%
8.0.1122.92%
6.5.1102.43%
12.0.2102.43%
8.0.092.19%
12.0.192.19%
7.071.70%
12.0.071.70%
6.5.561.46%
Other174.14%

Post.Office (342 servers)

Version Number of Servers Percent
3.5.34212.28%
4.1.2.4349.94%
4.1.0.2298.48%
4.0.1195.56%
4.1.1185.26%
4.2123.51%
3.9.2.3123.51%
3.5.3J102.92%
3.8.3102.92%
4.1.0.3102.92%
3.1.2J92.63%
4.1.0.482.34%
3.9.282.34%
4.2.282.34%
3.1.282.34%
3.6.272.05%
3.9.161.75%
4.1.2.361.75%
3.8.7.451.46%
4.0.1.151.46%
4.1.2.251.46%
4.2.1.351.46%
3.9.1.251.46%
4.0.0.141.17%
4.2.1.141.17%
3.5.441.17%
3.9.1.341.17%
3.9.2.241.17%
4.141.17%
3.5.141.17%
Other339.65%

MagicMail (307 servers)

Version Number of Servers Percent
Other307100.00%

Gordano Messaging Suite (GMS) (296 servers)

Version Number of Servers Percent
Other296100.00%

Trend Micro (278 servers)

Version Number of Servers Percent
5.710437.41%
5.56523.38%
5.184516.19%
7.03010.79%
7.1227.91%
3.5331.08%
Other93.24%

Mirapoint (118 servers)

Version Number of Servers Percent
4.3.5-GA1815.25%
3.10.10a-GA1210.17%
4.2.3-GA108.47%
4.3.6-GA97.63%
4.1.10-GA86.78%
3.10.9-GA75.93%
4.1.9-GA65.08%
4.4.2a-FCS43.39%
3.10.8-GA43.39%
4.1.5-GA32.54%
4.1.8-GA32.54%
3.8.5-GA32.54%
4.2.4-GA32.54%
4.3.3-GA32.54%
3.10.4-GA32.54%
3.7.5a-GA32.54%
4.1.3-GA32.54%
3.8.4-GA21.69%
3.10.3-GA21.69%
3.10.2-GA21.69%
3.8.3-GA21.69%
4.0.5a21.69%
Other65.08%

VisNetic (113 servers)

Version Number of Servers Percent
9.3.2.03228.32%
9.1.4.11210.62%
8.0.3.176.19%
5.5.8.365.31%
7.6.1.054.42%
6.2.2.054.42%
8.0.343.54%
8.5.0.843.54%
5.0.2.343.54%
8.0.3.043.54%
7.2.4.143.54%
5.8.6.643.54%
9.1.4.032.65%
5.4.5.432.65%
5.8.6.421.77%
5.3.5.021.77%
Other1210.62%

InterScan VirusWall (112 servers)

Version Number of Servers Percent
Other112100.00%

Mercury (47 servers)

Version Number of Servers Percent
1.482757.45%
3.321225.53%
1.4724.26%
3.21c24.26%
3.2112.13%
1.4412.13%
4.x12.13%
3.3012.13%
Other00.00%

Interscan (38 servers)

Version Number of Servers Percent
3.55 (build 1016)718.42%
3.81-Build_1022615.79%
3.55 (build 1029)513.16%
3.53 (build 2011)410.53%
3.81-Build_108437.89%
3.53 (build 1493)37.89%
3.8-Build_301325.26%
3.53 (build 2017)25.26%
3.5 (build 1294)12.63%
3.81-Build_105512.63%
3.51 (build 1337)12.63%
3.53 (build 2013)12.63%
3.8-Build_304512.63%
3.8-Build_108012.63%
Other00.00%

OpenSMTPD (38 servers)

Version Number of Servers Percent
Other38100.00%

NetIQ MailMarshal (24 servers)

Version Number of Servers Percent
6.0.3.81562.50%
5.5.6.7312.50%
5.5.6.528.33%
5.5.6.628.33%
5.5.5.614.17%
5.5.4.1714.17%
Other00.00%

WebSTAR V (24 servers)

Version Number of Servers Percent
5.4.11458.33%
5.4.0520.83%
5.3.4312.50%
5.3.314.17%
5.3.214.17%
Other00.00%

Neon Mail Server (20 servers)

Version Number of Servers Percent
3.0.7630.00%
3.1.4315.00%
3.1.2315.00%
3.1.3315.00%
3.0.9210.00%
3.1.0210.00%
3.0.615.00%
Other00.00%

OpenVMS (19 servers)

Version Number of Servers Percent
8.3842.11%
8.4631.58%
7.3421.05%
8.215.26%
Other00.00%

MessageWall (18 servers)

Version Number of Servers Percent
1.0.81794.44%
1.0.615.56%
Other00.00%

WebSTAR (13 servers)

Version Number of Servers Percent
Other13100.00%

ModusMail (11 servers)

Version Number of Servers Percent
4.35.477.0654.55%
4.1.361.2119.09%
3.2.315.019.09%
4.0.340.319.09%
4.35.477.819.09%
3.1.302.019.09%
Other00.00%

MAILsweeper (4 servers)

Version Number of Servers Percent
4.3.17.0250.00%
4.3.19.0125.00%
4.3.20.0125.00%
Other00.00%




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