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Mail (MX) Server Survey
September 1st, 2014

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 Queried2,410,576   100.0%
Number of Servers that didn't respond419,17417.39%
    Server didn't open socket410,19617.02%
    Server didn't provide banner8,9780.37%
Server provided banner1,991,40282.61%
Server banner identifies software in use1,122,99546.59%

As indicated by the above table, of the 2,410,576 servers queried, only 1,122,995 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
Exim584,43152.04%
Postfix330,03729.39%
Sendmail94,0568.38%
Microsoft44,5373.97%
MailEnable30,8512.75%
MDaemon18,6661.66%
IMail4,8300.43%
Lotus Domino2,8810.26%
CommuniGate Pro2,7190.24%
WinWebMail2,0610.18%
XMail1,7290.15%
Qmail Toaster1,3310.12%
Kerio1,0150.09%
SurgeSMTP9450.08%
Merak7440.07%
ArGoSoft4600.04%
MagicMail2990.03%
Post.Office2680.02%
GroupWise2610.02%
Gordano Messaging Suite (GMS)2320.02%
Trend Micro1750.02%
OpenSMTPD1120.01%
InterScan VirusWall820.01%
Mirapoint710.01%
VisNetic580.01%
Mercury270.00%
Interscan210.00%
OpenVMS200.00%
WebSTAR V200.00%
NetIQ MailMarshal150.00%
Neon Mail Server150.00%
ModusMail100.00%
MessageWall80.00%
WebSTAR50.00%
MAILsweeper30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (584,431 servers)

Version Number of Servers Percent
4.82426,35472.95%
4.80.159,05010.10%
4.8025,0304.28%
4.7618,8313.22%
4.7216,2112.77%
4.6910,6631.82%
4.777,6821.31%
Other20,6103.53%

Postfix (330,037 servers)

Version Number of Servers Percent
Other330,037100.00%

Sendmail (94,056 servers)

Version Number of Servers Percent
8.13.821,38722.74%
8.14.519,10720.31%
8.14.414,92915.87%
8.13.112,35713.14%
8.14.37,1977.65%
8.12.11.200603082,7232.90%
8.13.6.200606142,4542.61%
8.14.71,7111.82%
8.14.21,3561.44%
8.11.61,1921.27%
8.12.101,1261.20%
8.14.11,0021.07%
Other7,5157.99%

Microsoft (44,537 servers)

Version Number of Servers Percent
6.0.3790.467534,84778.24%
6.0.3790.39593,8388.62%
7.5.7601.175142,1514.83%
6.0.3790.18301,0662.39%
7.0.6002.182644611.04%
5.0.2195.73814461.00%
Other1,7283.88%

MailEnable (30,851 servers)

Version Number of Servers Percent
1.986--2,9559.58%
6.5--2,3137.50%
5.10--1,4584.73%
8.04--1,0683.46%
4.26--1,0663.46%
6.0--1,0623.44%
8.00--9052.93%
7.06--8472.75%
8.51--8232.67%
8.50--7462.42%
1.981--5761.87%
7.50--5671.84%
7.07--5481.78%
7.0--4991.62%
7.53--4971.61%
6.57--4911.59%
6.70--4681.52%
8.51--8.514211.36%
6.03--3541.15%
Other13,18742.74%

MDaemon (18,666 servers)

Version Number of Servers Percent
14.0.31,8609.96%
14.0.21,8349.83%
11.0.31,1165.98%
11.0.01,0015.36%
13.0.49024.83%
13.0.57854.21%
13.5.16573.52%
13.6.25833.12%
14.0.05542.97%
12.5.64972.66%
10.0.04942.65%
10.1.24052.17%
13.6.04022.15%
13.5.23651.96%
10.1.13551.90%
12.5.43351.79%
13.0.33021.62%
13.6.12981.60%
9.6.12931.57%
10.1.02911.56%
13.0.22801.50%
9.6.62571.38%
9.6.22501.34%
Other4,55024.38%

IMail (4,830 servers)

Version Number of Servers Percent
12.3.0.10066613.79%
8.2253811.14%
12.2.0.2354599.50%
11.52996.19%
9.232966.13%
12.4.1.152785.76%
8.152545.26%
8.052174.49%
12.4.0.1661984.10%
11.031442.98%
12.4.1.91402.90%
11.011212.51%
12.1.0.2701102.28%
10.021072.22%
11.02951.97%
7.15861.78%
6.06831.72%
7.07641.33%
12.2.0.169611.26%
10.01521.08%
Other56211.64%

Lotus Domino (2,881 servers)

Version Number of Servers Percent
8.5.346416.11%
8.5.3FP61645.69%
8.5.21545.35%
8.5.3FP31455.03%
8.5.3FP21224.23%
8.5.3FP41164.03%
8.5.11073.71%
7.0.21053.64%
8.5.3FP5943.26%
8.5.2FP2923.19%
8.5862.99%
8.5.2FP3802.78%
8.5.3FP1782.71%
8.5.2FP4742.57%
7.0.3612.12%
8.5.1FP5531.84%
7.0451.56%
7.0.1421.46%
6.5.3401.39%
8.0.1391.35%
6.5.1391.35%
8.0.2391.35%
8.0371.28%
6.5.4371.28%
8.5.2FP1371.28%
6.5301.04%
Other50117.39%

CommuniGate Pro (2,719 servers)

Version Number of Servers Percent
6.0.930311.14%
5.1.1627510.11%
6.0.71354.97%
6.0.81314.82%
5.2.20923.38%
4.1.8873.20%
6.0.5782.87%
5.4.11692.54%
5.3.15602.21%
5.3.13592.17%
5.0.14562.06%
4.2.10521.91%
5.2.3491.80%
5.2.19461.69%
5.4.4441.62%
5.1.12431.58%
5.4.8421.54%
5.2.16371.36%
6.0.1361.32%
5.4.1361.32%
5.4.10341.25%
6.0.6341.25%
5.4.6341.25%
5.4.5311.14%
6.0.4281.03%
Other82830.45%

WinWebMail (2,061 servers)

Version Number of Servers Percent
3.8.1.335016.98%
3.8.0.12049.90%
3.7.6.11869.02%
3.9.0.11617.81%
3.8.1.51356.55%
3.8.1.11276.16%
3.7.3.11205.82%
3.8.6.11185.73%
3.8.5.11155.58%
3.7.7.3914.42%
3.8.2.1703.40%
3.7.1.1592.86%
3.9.0.5552.67%
3.8.3.1391.89%
3.7.5.1371.80%
3.8.3.3361.75%
3.7.0.5231.12%
3.7.0.3221.07%
3.7.0.7221.07%
3.6.3.1211.02%
Other703.40%

XMail (1,729 servers)

Version Number of Servers Percent
1.2758433.78%
1.2247027.18%
1.2524214.00%
1.261609.25%
1.241005.78%
1.21472.72%
1.23291.68%
1.20201.16%
1.17191.10%
Other583.35%

Qmail Toaster (1,331 servers)

Version Number of Servers Percent
1.31,25794.44%
1.2352.63%
Other392.93%

Kerio (1,015 servers)

Version Number of Servers Percent
6.7.319118.82%
6.7.010510.34%
6.6.2888.67%
6.5.0757.39%
6.5.2727.09%
6.7.2686.70%
6.4.1575.62%
6.3.1464.53%
6.6.1464.53%
6.7.1424.14%
6.5.1313.05%
6.4.0272.66%
6.3.0262.56%
6.4.2232.27%
6.6.0181.77%
6.2.0111.08%
Other898.77%

SurgeSMTP (945 servers)

Version Number of Servers Percent
6.5a2-225126.56%
6.5a-19510.05%
6.3c2-2747.83%
6.4a-1697.30%
5.2a-1464.87%
5.3h2-2373.92%
6.1c-1353.70%
3.9e-1272.86%
6.7a-1222.33%
3.8k4-4212.22%
6.0a5-5181.90%
4.0u4-4161.69%
6.7b-13141.48%
3.9h-18101.06%
Other21022.22%

Merak (744 servers)

Version Number of Servers Percent
8.0.326435.48%
8.9.19913.31%
8.5.0526.99%
8.3.8395.24%
7.4.5374.97%
7.5.2374.97%
7.6.4324.30%
7.6.1152.02%
8.3.15121.61%
7.4.2111.48%
8.9.0101.34%
7.2.0101.34%
9.0.0101.34%
8.2.491.21%
7.0.191.21%
Other9813.17%

ArGoSoft (460 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)12326.74%
1.8 (1.8.9.5)6614.35%
1.8 (1.8.9.3)6213.48%
1.8 (1.8.9.1)459.78%
1.8 (1.8.8.7)286.09%
1.8 (1.8.8.8)255.43%
1.8 (1.8.9.2)194.13%
1.8 (1.8.9.4)122.61%
1.8 (1.8.6.0)102.17%
1.8 (1.8.7.3)71.52%
1.8 (1.8.8.9)61.30%
Other5712.39%

MagicMail (299 servers)

Version Number of Servers Percent
Other299100.00%

Post.Office (268 servers)

Version Number of Servers Percent
3.5.33914.55%
4.1.2.43513.06%
4.2.23211.94%
4.1.0.2165.97%
4.1.1145.22%
4.0.1124.48%
3.5.3J93.36%
3.9.2.393.36%
4.2.1.382.99%
4.1.0.382.99%
3.1.2J62.24%
4.2.1.162.24%
4.262.24%
4.1.2.351.87%
3.9.241.49%
3.9.141.49%
3.5.441.49%
3.8.7.441.49%
3.1.241.49%
3.5.131.12%
4.1.2.231.12%
3.9.1.231.12%
4.1.0.431.12%
3.9.2.131.12%
3.5.231.12%
4.2.1.231.12%
3.9.1.331.12%
Other197.09%

GroupWise (261 servers)

Version Number of Servers Percent
7.0.34115.71%
8.0.23011.49%
6.5.72710.34%
7.0.4228.43%
8.0.3218.05%
12.0.2197.28%
14.0.0186.90%
7.0.2166.13%
6.5.4114.21%
6.5.6103.83%
7.0.162.30%
6.5.551.92%
6.0.451.92%
8.0.141.53%
8.0.041.53%
12.0.141.53%
12.0.031.15%
Other155.75%

Gordano Messaging Suite (GMS) (232 servers)

Version Number of Servers Percent
Other232100.00%

Trend Micro (175 servers)

Version Number of Servers Percent
5.76637.71%
5.53821.71%
5.183419.43%
7.0137.43%
7.1105.71%
8.542.29%
3.5321.14%
5.1521.14%
Other63.43%

OpenSMTPD (112 servers)

Version Number of Servers Percent
Other112100.00%

InterScan VirusWall (82 servers)

Version Number of Servers Percent
Other82100.00%

Mirapoint (71 servers)

Version Number of Servers Percent
4.3.5-GA1014.08%
4.4.3-GA811.27%
4.3.6-GA79.86%
4.4.4-GA68.45%
4.1.10-GA45.63%
4.4.2a-FCS45.63%
4.2.3-GA45.63%
4.3.7-GA34.23%
3.10.10a-GA34.23%
3.10.7-GA22.82%
4.1.9-GA22.82%
3.10.4-GA22.82%
4.3.3-GA22.82%
4.4.4b-GA22.82%
4.1.5-GA22.82%
3.10.2-GA11.41%
3.8.4-GA11.41%
3.7.3a-GA11.41%
3.8.7a11.41%
3.7.5a-GA11.41%
4.1.3-GA11.41%
4.1.6-GA11.41%
4.2.4-GA11.41%
3.4.6-GR11.41%
4.1.8-GA11.41%
Other00.00%

VisNetic (58 servers)

Version Number of Servers Percent
9.3.2.01729.31%
9.1.4.158.62%
8.0.3.146.90%
8.5.0.846.90%
7.2.4.146.90%
6.2.2.035.17%
5.5.8.335.17%
5.8.6.623.45%
7.6.1.023.45%
9.1.4.023.45%
5.0.2.323.45%
8.3.5.023.45%
5.3.5.023.45%
8.5.0.511.72%
8.3.0.111.72%
8.0.3.011.72%
8.0.311.72%
5.0.2.011.72%
9.1.4.1 provided by Techfount Systems Pte Ltd11.72%
Other00.00%

Mercury (27 servers)

Version Number of Servers Percent
3.321244.44%
1.481244.44%
3.2113.70%
3.21c13.70%
4.x13.70%
Other00.00%

Interscan (21 servers)

Version Number of Servers Percent
3.81-Build_1022419.05%
3.81-Build_1084314.29%
3.55 (build 1016)314.29%
3.8-Build_301329.52%
3.55 (build 1029)29.52%
3.53 (build 1493)29.52%
3.5 (build 1294)14.76%
3.55 (build 1020)14.76%
3.53 (build 2013)14.76%
3.53 (build 2017)14.76%
3.8-Build_108014.76%
Other00.00%

OpenVMS (20 servers)

Version Number of Servers Percent
8.3840.00%
8.4735.00%
7.3420.00%
8.215.00%
Other00.00%

WebSTAR V (20 servers)

Version Number of Servers Percent
5.4.1945.00%
5.4.0735.00%
5.3.4315.00%
5.3.315.00%
Other00.00%

NetIQ MailMarshal (15 servers)

Version Number of Servers Percent
6.0.3.81066.67%
5.5.6.5213.33%
5.5.5.616.67%
5.5.4.1716.67%
5.5.6.716.67%
Other00.00%

Neon Mail Server (15 servers)

Version Number of Servers Percent
3.0.7426.67%
3.1.4320.00%
3.1.2213.33%
3.1.0213.33%
3.1.316.67%
3.0.616.67%
3.0.816.67%
3.0.916.67%
Other00.00%

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%

MessageWall (8 servers)

Version Number of Servers Percent
1.0.8787.50%
1.0.6112.50%
Other00.00%

WebSTAR (5 servers)

Version Number of Servers Percent
Other5100.00%

MAILsweeper (3 servers)

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




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