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Mail (MX) Server Survey
December 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 Queried2,495,673   100.0%
Number of Servers that didn't respond448,47817.97%
    Server didn't open socket437,70717.54%
    Server didn't provide banner10,7710.43%
Server provided banner2,047,19582.03%
Server banner identifies software in use1,136,51845.54%

As indicated by the above table, of the 2,495,673 servers queried, only 1,136,518 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
Exim561,37849.39%
Postfix320,85428.23%
Sendmail108,3069.53%
Microsoft67,9075.98%
MailEnable32,4932.86%
MDaemon20,3851.79%
IMail6,1400.54%
Lotus Domino3,8650.34%
CommuniGate Pro3,0030.26%
WinWebMail2,8440.25%
XMail1,9990.18%
Qmail Toaster1,4890.13%
Kerio1,2530.11%
SurgeSMTP9910.09%
Merak9680.09%
ArGoSoft5800.05%
Post.Office3340.03%
GroupWise3300.03%
MagicMail3110.03%
Gordano Messaging Suite (GMS)2860.03%
Trend Micro2540.02%
Mirapoint1060.01%
InterScan VirusWall1020.01%
VisNetic850.01%
OpenSMTPD670.01%
Mercury390.00%
Interscan300.00%
OpenVMS230.00%
WebSTAR V220.00%
NetIQ MailMarshal220.00%
Neon Mail Server160.00%
MessageWall110.00%
WebSTAR110.00%
ModusMail100.00%
MAILsweeper40.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (561,378 servers)

Version Number of Servers Percent
4.80.1345,94461.62%
4.80117,43220.92%
4.7220,0763.58%
4.7617,4323.11%
4.6915,4762.76%
4.8212,7002.26%
4.7712,1692.17%
Other20,1493.59%

Postfix (320,854 servers)

Version Number of Servers Percent
Other320,854100.00%

Sendmail (108,306 servers)

Version Number of Servers Percent
8.13.827,74225.61%
8.13.114,86713.73%
8.14.414,67913.55%
8.14.314,38213.28%
8.14.513,74212.69%
8.12.11.200603083,5103.24%
8.13.6.200606142,9812.75%
8.14.22,2722.10%
8.11.61,6251.50%
8.14.71,4801.37%
8.12.101,4711.36%
8.14.11,3761.27%
8.13.61,1941.10%
Other6,9856.45%

Microsoft (67,907 servers)

Version Number of Servers Percent
6.0.3790.467554,56480.35%
6.0.3790.39596,3909.41%
7.5.7601.175142,2373.29%
6.0.3790.18301,7002.50%
Other3,0164.44%

MailEnable (32,493 servers)

Version Number of Servers Percent
1.986--4,28113.18%
6.5--2,4537.55%
5.10--1,9395.97%
4.26--1,4804.55%
6.0--1,2793.94%
7.06--8832.72%
1.981--8162.51%
7.50--6672.05%
7.07--6371.96%
7.0--5661.74%
6.70--5451.68%
6.57--5281.62%
6.03--5011.54%
7.09--4911.51%
1.983--4641.43%
3.62--4261.31%
0-6.83-3901.20%
0-3.65-3581.10%
5.51--3431.06%
Other13,44641.38%

MDaemon (20,385 servers)

Version Number of Servers Percent
13.6.02,09810.29%
13.5.21,6688.18%
11.0.31,4927.32%
13.0.41,2085.93%
11.0.01,1645.71%
13.0.51,1265.52%
13.5.17793.82%
13.0.36973.42%
10.0.06513.19%
12.5.66052.97%
10.1.25372.63%
10.1.15272.59%
13.0.24242.08%
12.5.43931.93%
9.6.13821.87%
9.6.63561.75%
10.1.03441.69%
9.6.22681.31%
9.5.22361.16%
12.5.82151.05%
10.0.22131.04%
12.0.32101.03%
10.0.52091.03%
Other4,58322.48%

IMail (6,140 servers)

Version Number of Servers Percent
8.2299616.22%
12.3.0.10084313.73%
12.2.0.23569111.25%
11.54206.84%
8.153475.65%
9.233465.64%
11.032504.07%
8.052474.02%
10.021933.14%
12.1.0.2701602.61%
11.011482.41%
11.021352.20%
7.071312.13%
6.061111.81%
7.151081.76%
12.2.0.1691051.71%
8.00981.60%
10.01911.48%
11.0671.09%
Other65310.64%

Lotus Domino (3,865 servers)

Version Number of Servers Percent
8.5.363116.33%
8.5.3FP32386.16%
8.5.22075.36%
8.5.3FP21904.92%
8.5.3FP41834.73%
8.5.11614.17%
7.0.21453.75%
8.5.2FP21433.70%
8.5.3FP11353.49%
8.5.3FP51243.21%
8.51122.90%
8.5.2FP31062.74%
8.5.2FP4912.35%
7.0.3741.91%
8.5.1FP5731.89%
7.0651.68%
8.0.1631.63%
6.5.3611.58%
8.0.2601.55%
7.0.1591.53%
6.5.1591.53%
8.5.2FP1581.50%
6.5.4541.40%
6.5.5511.32%
8.0491.27%
6.5401.03%
Other63316.38%

CommuniGate Pro (3,003 servers)

Version Number of Servers Percent
5.1.162879.56%
6.0.71846.13%
6.0.51535.09%
5.2.201093.63%
4.1.81033.43%
5.4.10933.10%
6.0.6812.70%
5.3.13762.53%
5.4.8672.23%
6.0.1652.16%
5.4.4642.13%
5.3.15632.10%
4.2.10622.06%
5.4.6612.03%
5.0.14571.90%
5.1.12541.80%
5.4.1531.76%
5.2.19521.73%
5.2.16481.60%
6.0.4481.60%
5.2.3471.57%
5.4.5431.43%
5.4.0361.20%
5.2.14341.13%
5.4.2331.10%
5.4.7311.03%
Other99933.27%

WinWebMail (2,844 servers)

Version Number of Servers Percent
3.8.1.353818.92%
3.8.0.132711.50%
3.7.6.12669.35%
3.8.5.12358.26%
3.8.1.52257.91%
3.8.1.11896.65%
3.7.3.11736.08%
3.8.6.11605.63%
3.7.7.31495.24%
3.8.2.11314.61%
3.7.1.1863.02%
3.7.5.1652.29%
3.8.3.1632.22%
3.8.3.3531.86%
3.6.3.1391.37%
3.7.0.5351.23%
3.7.0.3321.13%
Other782.74%

XMail (1,999 servers)

Version Number of Servers Percent
1.2764332.17%
1.2249824.91%
1.2528914.46%
1.2620510.26%
1.241296.45%
1.21653.25%
1.23371.85%
1.17311.55%
1.20221.10%
Other804.00%

Qmail Toaster (1,489 servers)

Version Number of Servers Percent
1.31,41695.10%
1.2412.75%
Other322.15%

Kerio (1,253 servers)

Version Number of Servers Percent
6.7.321917.48%
6.7.01259.98%
6.6.21219.66%
6.5.01007.98%
6.5.2866.86%
6.7.2766.07%
6.4.1715.67%
6.7.1594.71%
6.3.1594.71%
6.6.1493.91%
6.4.0463.67%
6.5.1403.19%
6.4.2292.31%
6.3.0292.31%
6.6.0282.23%
6.0.10171.36%
Other997.90%

SurgeSMTP (991 servers)

Version Number of Servers Percent
6.3c2-220120.28%
6.4a-115015.14%
6.5a-1999.99%
5.2a-1535.35%
6.1c-1525.25%
5.3h2-2515.15%
3.9e-1383.83%
6.0a5-5232.32%
3.8k4-4202.02%
4.0u4-4171.72%
5.0e4-4151.51%
4.2d2-2141.41%
6.0a4-4121.21%
3.9h-18111.11%
3.8i3-3111.11%
6.5b-24111.11%
4.2d4-4101.01%
4.2a3-3101.01%
Other19319.48%

Merak (968 servers)

Version Number of Servers Percent
8.0.336437.60%
8.9.111111.47%
8.5.0656.71%
8.3.8515.27%
7.5.2484.96%
7.6.4404.13%
7.4.5404.13%
7.0.1191.96%
7.6.1171.76%
7.4.2151.55%
7.2.0141.45%
8.3.15131.34%
7.6.0131.34%
9.0.0131.34%
6.2.1121.24%
8.9.0121.24%
8.2.4111.14%
4.4.2101.03%
Other10010.33%

ArGoSoft (580 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)15025.86%
1.8 (1.8.9.5)8113.97%
1.8 (1.8.9.3)7012.07%
1.8 (1.8.9.1)6811.72%
1.8 (1.8.8.7)376.38%
1.8 (1.8.8.8)345.86%
1.8 (1.8.9.2)223.79%
1.8 (1.8.9.4)172.93%
1.8 (1.8.6.0)111.90%
1.8 (1.8.8.9)101.72%
1.8 (1.8.8.1)61.03%
Other7412.76%

Post.Office (334 servers)

Version Number of Servers Percent
3.5.34413.17%
4.1.2.43410.18%
4.1.0.2288.38%
4.2.2195.69%
4.0.1185.39%
4.1.1144.19%
3.9.2.3133.89%
3.5.3J123.59%
4.2113.29%
4.1.0.392.69%
3.9.292.69%
4.1.0.482.40%
3.1.2J72.10%
4.2.1.372.10%
3.8.372.10%
4.2.1.172.10%
3.1.261.80%
3.9.161.80%
3.6.251.50%
4.1.2.351.50%
3.9.1.251.50%
4.0.1.141.20%
3.5.441.20%
3.5.141.20%
4.1.2.241.20%
3.8.7.441.20%
3.9.2.241.20%
3.9.1.341.20%
4.141.20%
Other288.38%

GroupWise (330 servers)

Version Number of Servers Percent
7.0.35516.67%
8.0.24613.94%
6.5.74413.33%
7.0.4267.88%
8.0.3236.97%
7.0.2226.67%
6.5.6175.15%
12.0.2154.55%
6.5.4123.64%
7.0.1113.33%
6.0.482.42%
12.0.182.42%
8.0.172.12%
8.0.051.52%
6.5.551.52%
7.051.52%
Other216.36%

MagicMail (311 servers)

Version Number of Servers Percent
Other311100.00%

Gordano Messaging Suite (GMS) (286 servers)

Version Number of Servers Percent
Other286100.00%

Trend Micro (254 servers)

Version Number of Servers Percent
5.79838.58%
5.55822.83%
5.184417.32%
7.0259.84%
7.1155.91%
8.531.18%
3.5331.18%
Other83.15%

Mirapoint (106 servers)

Version Number of Servers Percent
4.3.5-GA1413.21%
3.10.10a-GA1312.26%
4.3.6-GA98.49%
4.4.3-GA87.55%
4.2.3-GA87.55%
4.4.2a-FCS65.66%
4.1.10-GA54.72%
4.1.9-GA54.72%
4.2.4-GA43.77%
3.10.8-GA43.77%
3.10.9-GA32.83%
4.1.5-GA32.83%
4.3.3-GA21.89%
3.10.4-GA21.89%
3.8.5-GA21.89%
3.8.3-GA21.89%
4.3.7-GA21.89%
3.8.4-GA21.89%
4.1.3-GA21.89%
Other109.43%

InterScan VirusWall (102 servers)

Version Number of Servers Percent
Other102100.00%

VisNetic (85 servers)

Version Number of Servers Percent
9.3.2.02529.41%
9.1.4.189.41%
8.0.3.167.06%
8.5.0.844.71%
6.2.2.044.71%
5.5.8.344.71%
5.0.2.344.71%
9.1.4.033.53%
5.8.6.633.53%
7.2.4.133.53%
8.0.322.35%
7.6.1.022.35%
8.0.3.022.35%
5.8.6.422.35%
5.0.2.022.35%
5.3.5.022.35%
8.5.0.511.18%
8.3.0.011.18%
8.3.0.111.18%
5.4.5.411.18%
8.3.5.011.18%
9.1.4.1 da-lax-msg mail.davidco.com11.18%
6.0.9.011.18%
7.5.3.011.18%
9.1.4.1 provided by Techfount Systems Pte Ltd11.18%
Other00.00%

OpenSMTPD (67 servers)

Version Number of Servers Percent
Other67100.00%

Mercury (39 servers)

Version Number of Servers Percent
1.482153.85%
3.321230.77%
1.4725.13%
3.21c25.13%
3.2112.56%
4.x12.56%
Other00.00%

Interscan (30 servers)

Version Number of Servers Percent
3.81-Build_1022620.00%
3.55 (build 1016)620.00%
3.55 (build 1029)516.67%
3.81-Build_1084310.00%
3.8-Build_301326.67%
3.53 (build 2011)26.67%
3.5 (build 1294)13.33%
3.51 (build 1337)13.33%
3.53 (build 2013)13.33%
3.53 (build 2017)13.33%
3.53 (build 1493)13.33%
3.8-Build_304513.33%
Other00.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.31043.48%
8.4730.43%
7.3521.74%
8.214.35%
Other00.00%

WebSTAR V (22 servers)

Version Number of Servers Percent
5.4.11254.55%
5.4.0522.73%
5.3.4313.64%
5.3.314.55%
5.3.214.55%
Other00.00%

NetIQ MailMarshal (22 servers)

Version Number of Servers Percent
6.0.3.81463.64%
5.5.6.529.09%
5.5.6.629.09%
5.5.5.614.55%
5.5.4.1714.55%
5.5.6.714.55%
6.1.3.1514.55%
Other00.00%

Neon Mail Server (16 servers)

Version Number of Servers Percent
3.0.7531.25%
3.1.4212.50%
3.1.2212.50%
3.0.9212.50%
3.1.0212.50%
3.1.316.25%
3.1.516.25%
3.0.616.25%
Other00.00%

MessageWall (11 servers)

Version Number of Servers Percent
1.0.81090.91%
1.0.619.09%
Other00.00%

WebSTAR (11 servers)

Version Number of Servers Percent
Other11100.00%

ModusMail (10 servers)

Version Number of Servers Percent
4.35.477.0660.00%
4.1.361.21110.00%
3.2.315.0110.00%
4.35.477.8110.00%
3.1.302.0110.00%
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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