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Mail (MX) Server Survey
September 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 Queried2,323,454   100.0%
Number of Servers that didn't respond395,29117.01%
    Server didn't open socket386,02416.61%
    Server didn't provide banner9,2670.40%
Server provided banner1,928,16382.99%
Server banner identifies software in use1,070,55346.08%

As indicated by the above table, of the 2,323,454 servers queried, only 1,070,553 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
Exim540,95650.53%
Postfix279,64026.12%
Sendmail105,6899.87%
Microsoft69,5976.50%
MailEnable31,7352.96%
MDaemon19,0461.78%
IMail6,0270.56%
Lotus Domino3,6450.34%
CommuniGate Pro2,8040.26%
WinWebMail2,5580.24%
XMail1,8310.17%
Qmail Toaster1,4300.13%
Kerio1,2180.11%
Merak9730.09%
SurgeSMTP9220.09%
ArGoSoft5370.05%
GroupWise3650.03%
MagicMail2900.03%
Gordano Messaging Suite (GMS)2780.03%
Post.Office2730.03%
Trend Micro2280.02%
Mirapoint1110.01%
InterScan VirusWall920.01%
VisNetic910.01%
OpenSMTPD400.00%
Mercury380.00%
Interscan290.00%
WebSTAR V210.00%
NetIQ MailMarshal210.00%
OpenVMS190.00%
Neon Mail Server160.00%
WebSTAR110.00%
MessageWall110.00%
ModusMail80.00%
MAILsweeper30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (540,956 servers)

Version Number of Servers Percent
4.80.1298,54655.19%
4.80153,75728.42%
4.7220,9063.86%
4.6917,8923.31%
4.7615,4482.86%
4.7713,3002.46%
Other21,1073.90%

Postfix (279,640 servers)

Version Number of Servers Percent
Other279,640100.00%

Sendmail (105,689 servers)

Version Number of Servers Percent
8.13.827,29325.82%
8.13.115,26214.44%
8.14.314,35513.58%
8.14.413,02312.32%
8.14.512,92712.23%
8.12.11.200603083,7813.58%
8.13.6.200606143,0792.91%
8.14.22,5102.37%
8.11.61,6501.56%
8.12.101,5061.42%
8.14.11,3601.29%
8.13.61,1631.10%
8.13.71,1011.04%
Other6,6796.32%

Microsoft (69,597 servers)

Version Number of Servers Percent
6.0.3790.467556,34080.95%
6.0.3790.39596,7379.68%
7.5.7601.175141,9072.74%
6.0.3790.18301,7822.56%
Other2,8314.07%

MailEnable (31,735 servers)

Version Number of Servers Percent
1.986--4,72014.87%
6.5--2,1946.91%
5.10--2,0946.60%
4.26--1,6245.12%
6.0--1,3034.11%
1.981--9042.85%
7.06--7632.40%
6.70--5501.73%
7.0--5371.69%
6.57--4991.57%
1.983--4931.55%
3.62--4801.51%
6.03--4621.46%
7.09--4531.43%
0-6.83-4251.34%
5.51--4161.31%
7.07--3971.25%
6.60--3951.24%
0-3.65-3631.14%
7.09--7.093251.02%
5.11--3221.01%
Other12,01637.86%

MDaemon (19,046 servers)

Version Number of Servers Percent
13.5.12,12911.18%
13.0.51,5328.04%
11.0.31,4367.54%
13.0.41,3807.25%
11.0.01,1616.10%
13.0.38614.52%
10.0.06623.48%
12.5.66303.31%
10.1.25332.80%
10.1.15072.66%
13.5.04692.46%
13.0.24492.36%
9.6.13802.00%
12.5.43651.92%
9.6.63571.87%
10.1.03351.76%
9.6.22701.42%
12.0.32281.20%
12.5.82181.14%
9.5.22181.14%
10.0.52061.08%
10.0.22061.08%
12.5.32031.07%
9.6.51981.04%
Other4,11321.60%

IMail (6,027 servers)

Version Number of Servers Percent
8.221,00516.67%
12.2.0.23572211.98%
12.3.0.10064210.65%
11.54627.67%
9.233626.01%
8.153475.76%
11.032424.02%
8.052343.88%
12.2.0.1691993.30%
10.021883.12%
12.1.0.2701582.62%
11.021312.17%
7.071282.12%
7.151051.74%
6.061051.74%
8.00931.54%
10.01841.39%
11.0811.34%
11.01781.29%
9.21631.05%
Other5989.92%

Lotus Domino (3,645 servers)

Version Number of Servers Percent
8.5.364017.56%
8.5.3FP32647.24%
8.5.3FP21975.40%
8.5.3FP41965.38%
8.5.21905.21%
8.5.2FP21524.17%
8.5.11453.98%
7.0.21313.59%
8.5.3FP11283.51%
8.51163.18%
8.5.2FP31153.16%
8.5.2FP4832.28%
7.0.3762.09%
8.5.1FP5742.03%
8.5.2FP1671.84%
7.0631.73%
8.0.1611.67%
6.5.4541.48%
6.5.1541.48%
8.0.2521.43%
6.5.3511.40%
7.0.1491.34%
6.5.5431.18%
8.0411.12%
6.5381.04%
Other56515.50%

CommuniGate Pro (2,804 servers)

Version Number of Servers Percent
5.1.162689.56%
6.0.52318.24%
4.1.81053.74%
5.2.20993.53%
5.4.10802.85%
6.0.4742.64%
5.3.13742.64%
5.4.4732.60%
6.0.1722.57%
5.4.8722.57%
5.4.6662.35%
4.2.10612.18%
5.3.15602.14%
5.2.19562.00%
5.4.1551.96%
5.1.12521.85%
5.2.3511.82%
5.0.14501.78%
5.2.16491.75%
5.4.5421.50%
5.4.9401.43%
5.4.7391.39%
5.4.3361.28%
5.4.2341.21%
5.4.0311.11%
5.2.14291.03%
Other90532.28%

WinWebMail (2,558 servers)

Version Number of Servers Percent
3.8.1.349719.43%
3.8.0.130111.77%
3.8.5.12339.11%
3.7.6.12339.11%
3.8.1.52047.97%
3.8.1.11827.11%
3.7.3.11656.45%
3.7.7.31535.98%
3.8.2.11345.24%
3.7.1.1773.01%
3.7.5.1692.70%
3.8.3.1652.54%
3.8.3.3592.31%
3.7.0.3361.41%
3.7.0.5301.17%
3.6.3.1301.17%
3.7.0.7271.06%
3.7.7.1271.06%
Other361.41%

XMail (1,831 servers)

Version Number of Servers Percent
1.2755630.37%
1.2246925.61%
1.2527815.18%
1.2619910.87%
1.241196.50%
1.21492.68%
1.23372.02%
1.17271.47%
1.20231.26%
Other744.04%

Qmail Toaster (1,430 servers)

Version Number of Servers Percent
1.31,36295.24%
1.2352.45%
Other332.31%

Kerio (1,218 servers)

Version Number of Servers Percent
6.7.321817.90%
6.6.21199.77%
6.7.01189.69%
6.5.0988.05%
6.5.2897.31%
6.7.2756.16%
6.7.1645.25%
6.4.1625.09%
6.3.1504.11%
6.6.1413.37%
6.4.0413.37%
6.5.1362.96%
6.6.0292.38%
6.4.2262.13%
6.3.0231.89%
6.0.10171.40%
Other1129.20%

Merak (973 servers)

Version Number of Servers Percent
8.0.338639.67%
8.9.110610.89%
8.5.0565.76%
8.3.8495.04%
7.5.2424.32%
7.4.5414.21%
7.6.4363.70%
7.6.1181.85%
7.0.1171.75%
7.4.2151.54%
9.0.0141.44%
8.3.15131.34%
7.6.0131.34%
8.9.0121.23%
7.2.0121.23%
6.1.0111.13%
8.2.4111.13%
6.2.1111.13%
4.4.2101.03%
Other10010.28%

SurgeSMTP (922 servers)

Version Number of Servers Percent
6.3c2-229231.67%
6.4a-1818.79%
6.1c-1566.07%
5.3h2-2566.07%
5.2a-1545.86%
3.9e-1363.90%
6.0a5-5262.82%
3.8k4-4222.39%
4.0u4-4192.06%
4.2d2-2171.84%
5.0e4-4121.30%
3.8i3-3111.19%
6.0a4-4111.19%
3.9h-18101.08%
4.2d4-4101.08%
Other20922.67%

ArGoSoft (537 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)14226.44%
1.8 (1.8.9.5)6712.48%
1.8 (1.8.9.3)6411.92%
1.8 (1.8.9.1)6111.36%
1.8 (1.8.8.7)356.52%
1.8 (1.8.8.8)285.21%
1.8 (1.8.9.2)234.28%
1.8 (1.8.9.4)152.79%
1.8 (1.8.8.9)112.05%
1.8 (1.8.6.0)81.49%
1.8 (1.8.7.3)61.12%
1.8 (1.8.8.1)61.12%
Other7113.22%

GroupWise (365 servers)

Version Number of Servers Percent
7.0.36417.53%
8.0.25214.25%
6.5.74412.05%
7.0.4328.77%
7.0.2267.12%
8.0.3205.48%
6.5.4164.38%
6.5.6164.38%
7.0.1133.56%
12.0.2123.29%
6.0.4102.74%
8.0.192.47%
8.0.071.92%
6.5.171.92%
12.0.161.64%
12.0.061.64%
7.051.37%
6.5.551.37%
6.5.241.10%
Other113.01%

MagicMail (290 servers)

Version Number of Servers Percent
Other290100.00%

Gordano Messaging Suite (GMS) (278 servers)

Version Number of Servers Percent
Other278100.00%

Post.Office (273 servers)

Version Number of Servers Percent
3.5.34115.02%
4.1.0.2238.42%
4.1.2.4238.42%
4.0.1155.49%
3.5.3J114.03%
4.1.1114.03%
4.2103.66%
4.2.2103.66%
4.1.0.382.93%
3.1.282.93%
3.9.2.372.56%
3.1.2J72.56%
3.8.372.56%
4.2.1.362.20%
4.1.0.462.20%
3.9.262.20%
3.5.441.47%
3.8.7.441.47%
4.2.1.141.47%
3.6.241.47%
4.0.1.141.47%
3.5.141.47%
3.9.2.241.47%
4.1.2.231.10%
3.9.131.10%
4.2.1.231.10%
4.2.131.10%
3.9.1.331.10%
4.131.10%
4.1.2.331.10%
3.9.1.231.10%
3.9.2.131.10%
Other196.96%

Trend Micro (228 servers)

Version Number of Servers Percent
5.79139.91%
5.55222.81%
5.183013.16%
7.02611.40%
7.1187.89%
Other114.82%

Mirapoint (111 servers)

Version Number of Servers Percent
3.10.10a-GA1513.51%
4.3.5-GA1210.81%
4.2.3-GA109.01%
4.3.6-GA98.11%
4.1.10-GA87.21%
3.10.9-GA76.31%
4.4.2a-FCS65.41%
3.10.8-GA43.60%
4.1.9-GA43.60%
4.3.3-GA32.70%
4.2.4-GA32.70%
4.1.3-GA32.70%
4.1.5-GA32.70%
3.7.5a-GA21.80%
3.8.4-GA21.80%
3.8.5-GA21.80%
3.10.3-GA21.80%
4.1.8-GA21.80%
4.0.5a21.80%
4.3.7-GA21.80%
Other109.01%

InterScan VirusWall (92 servers)

Version Number of Servers Percent
Other92100.00%

VisNetic (91 servers)

Version Number of Servers Percent
9.3.2.02527.47%
9.1.4.11112.09%
5.5.8.366.59%
8.0.3.144.40%
8.5.0.844.40%
7.6.1.044.40%
5.0.2.344.40%
9.1.4.033.30%
5.8.6.633.30%
8.0.333.30%
8.0.3.033.30%
7.2.4.133.30%
5.8.6.422.20%
5.4.5.422.20%
5.3.5.022.20%
6.2.2.022.20%
8.5.0.511.10%
8.3.0.111.10%
7-6-1-011.10%
5.0.2.011.10%
8.3.5.011.10%
9.1.4.1 da-lax-msg mail.davidco.com11.10%
6.0.9.011.10%
7.5.3.011.10%
9.1.4.1 provided by Techfount Systems Pte Ltd11.10%
8.3.0.011.10%
Other00.00%

OpenSMTPD (40 servers)

Version Number of Servers Percent
Other40100.00%

Mercury (38 servers)

Version Number of Servers Percent
1.481847.37%
3.321436.84%
1.4725.26%
3.21c25.26%
3.2112.63%
4.x12.63%
Other00.00%

Interscan (29 servers)

Version Number of Servers Percent
3.55 (build 1016)724.14%
3.81-Build_1022620.69%
3.55 (build 1029)517.24%
3.81-Build_1084310.34%
3.5 (build 1294)13.45%
3.8-Build_301313.45%
3.81-Build_105513.45%
3.51 (build 1337)13.45%
3.53 (build 2013)13.45%
3.53 (build 2017)13.45%
3.8-Build_304513.45%
3.8-Build_108013.45%
Other00.00%

WebSTAR V (21 servers)

Version Number of Servers Percent
5.4.11047.62%
5.4.0523.81%
5.3.4314.29%
5.3.229.52%
5.3.314.76%
Other00.00%

NetIQ MailMarshal (21 servers)

Version Number of Servers Percent
6.0.3.81361.90%
5.5.6.7314.29%
5.5.6.529.52%
5.5.5.614.76%
5.5.4.1714.76%
5.5.6.614.76%
Other00.00%

OpenVMS (19 servers)

Version Number of Servers Percent
8.3947.37%
8.4526.32%
7.3421.05%
8.215.26%
Other00.00%

Neon Mail Server (16 servers)

Version Number of Servers Percent
3.0.7531.25%
3.1.4318.75%
3.1.2212.50%
3.1.0212.50%
3.1.316.25%
3.0.916.25%
3.1.516.25%
3.0.616.25%
Other00.00%

WebSTAR (11 servers)

Version Number of Servers Percent
Other11100.00%

MessageWall (11 servers)

Version Number of Servers Percent
1.0.811100.00%
Other00.00%

ModusMail (8 servers)

Version Number of Servers Percent
4.35.477.0450.00%
4.1.361.21112.50%
3.2.315.0112.50%
4.35.477.8112.50%
3.1.302.0112.50%
Other00.00%

MAILsweeper (3 servers)

Version Number of Servers Percent
4.3.17.0266.67%
4.3.20.0133.33%
Other00.00%




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