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Mail (MX) Server Survey
March 1st, 2015

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 Queried2,441,369   100.0%
Number of Servers that didn't respond430,94317.65%
    Server didn't open socket421,63817.27%
    Server didn't provide banner9,3050.38%
Server provided banner2,010,42682.35%
Server banner identifies software in use1,140,13846.70%

As indicated by the above table, of the 2,441,369 servers queried, only 1,140,138 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
Exim597,35752.39%
Postfix349,91330.69%
Sendmail88,5197.76%
Microsoft36,1633.17%
MailEnable30,3132.66%
MDaemon18,5391.63%
IMail4,4710.39%
CommuniGate Pro2,6540.23%
Lotus Domino2,6350.23%
WinWebMail2,1040.18%
XMail1,6680.15%
Qmail Toaster1,3190.12%
Kerio9240.08%
SurgeSMTP8710.08%
Merak6350.06%
ArGoSoft4170.04%
MagicMail2740.02%
Post.Office2470.02%
GroupWise2450.02%
Gordano Messaging Suite (GMS)2150.02%
OpenSMTPD1920.02%
Trend Micro1540.01%
InterScan VirusWall760.01%
Mirapoint630.01%
VisNetic460.00%
Mercury270.00%
Interscan210.00%
OpenVMS180.00%
WebSTAR V150.00%
Neon Mail Server120.00%
ModusMail100.00%
NetIQ MailMarshal80.00%
MessageWall60.00%
MAILsweeper40.00%
WebSTAR30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (597,357 servers)

Version Number of Servers Percent
4.84286,84548.02%
4.82198,64633.25%
4.8021,9703.68%
4.80.121,8423.66%
4.7617,9843.01%
4.7216,7272.80%
4.698,4231.41%
Other24,9204.17%

Postfix (349,913 servers)

Version Number of Servers Percent
Other349,913100.00%

Sendmail (88,519 servers)

Version Number of Servers Percent
8.13.819,42221.94%
8.14.518,45120.84%
8.14.414,94016.88%
8.13.111,22412.68%
8.14.36,2687.08%
8.12.11.200603082,1932.48%
8.13.6.200606142,0132.27%
8.14.71,9862.24%
8.14.91,3941.57%
8.14.21,1871.34%
8.11.61,0451.18%
8.12.109831.11%
8.14.18941.01%
Other6,5197.36%

Microsoft (36,163 servers)

Version Number of Servers Percent
6.0.3790.467527,50976.07%
6.0.3790.39592,9938.28%
7.5.7601.175142,3406.47%
6.0.3790.18308152.25%
7.0.6002.182644461.23%
5.0.2195.73813741.03%
Other1,6864.66%

MailEnable (30,313 servers)

Version Number of Servers Percent
1.986--2,4418.05%
6.5--2,1257.01%
5.10--1,1943.94%
8.51--1,0393.43%
8.04--1,0273.39%
8.53--9813.24%
4.26--8702.87%
6.0--8492.80%
8.50--8122.68%
8.00--7812.58%
7.06--7592.50%
8.55--5611.85%
7.07--5031.66%
7.50--4711.55%
8.56--4591.51%
1.981--4561.50%
7.0--4501.48%
6.70--4191.38%
6.57--4171.38%
7.53--4131.36%
Other13,28643.83%

MDaemon (18,539 servers)

Version Number of Servers Percent
14.5.21,6999.16%
14.5.31,5648.44%
11.0.31,0015.40%
11.0.09295.01%
14.0.39234.98%
13.5.18614.64%
13.0.48524.60%
13.0.57854.23%
14.0.25663.05%
12.5.64652.51%
10.0.04592.48%
10.1.23661.97%
14.5.03571.93%
13.6.23321.79%
12.5.43311.79%
10.1.13181.72%
14.5.12901.56%
13.6.02831.53%
10.1.02531.36%
9.6.12531.36%
13.5.22411.30%
13.0.22411.30%
9.6.22361.27%
9.6.62351.27%
14.0.02201.19%
13.0.32191.18%
13.6.11861.00%
Other4,07421.98%

IMail (4,471 servers)

Version Number of Servers Percent
8.2250111.21%
12.3.0.10046310.36%
12.4.2.273848.59%
9.232746.13%
12.2.0.2352736.11%
12.4.1.152255.03%
8.152094.67%
12.5.1.601894.23%
8.051864.16%
11.51453.24%
12.5.0.2461443.22%
11.031292.89%
11.011262.82%
12.4.0.1661162.59%
7.15801.79%
11.02781.74%
10.02731.63%
12.5.0.248721.61%
12.4.1.9681.52%
6.06641.43%
7.07631.41%
12.1.0.270531.19%
8.00521.16%
Other50411.27%

CommuniGate Pro (2,654 servers)

Version Number of Servers Percent
5.1.1626710.06%
6.0.92248.44%
6.0.111415.31%
6.0.101405.28%
6.0.71033.88%
5.4.11893.35%
5.2.20873.28%
6.0.8702.64%
4.1.8682.56%
6.0.5592.22%
5.0.14572.15%
5.3.13562.11%
5.2.19521.96%
6.1491.85%
5.2.3491.85%
5.1.12421.58%
4.2.10411.54%
5.4.4381.43%
5.2.16361.36%
5.3.15341.28%
5.4.8321.21%
5.4.10321.21%
5.4.1311.17%
6.0.1301.13%
5.4.6291.09%
Other79830.07%

Lotus Domino (2,635 servers)

Version Number of Servers Percent
8.5.340515.37%
8.5.3FP627810.55%
8.5.21345.09%
8.5.3FP31114.21%
8.5.11053.98%
7.0.2943.57%
8.5.3FP2843.19%
8.5.2FP4762.88%
8.5.3FP4742.81%
8.5742.81%
8.5.3FP5722.73%
8.5.3FP1662.50%
8.5.2FP2652.47%
8.5.2FP3612.31%
7.0.3532.01%
8.5.1FP5461.75%
7.0461.75%
6.5.3401.52%
6.5.1381.44%
8.0371.40%
7.0.1371.40%
8.0.2351.33%
8.0.1351.33%
8.5.2FP1331.25%
6.5321.21%
6.5.4311.18%
Other47317.95%

WinWebMail (2,104 servers)

Version Number of Servers Percent
3.8.1.336617.40%
3.9.0.721610.27%
3.7.6.11878.89%
3.8.0.11828.65%
3.9.0.11537.27%
3.8.1.51255.94%
3.8.5.11075.09%
3.8.1.11065.04%
3.8.6.11044.94%
3.7.3.1984.66%
3.7.7.3843.99%
3.7.1.1612.90%
3.8.2.1582.76%
3.7.5.1341.62%
3.8.3.1331.57%
3.9.0.5331.57%
3.8.3.3281.33%
3.7.0.3221.05%
3.6.3.1221.05%
Other854.04%

XMail (1,668 servers)

Version Number of Servers Percent
1.2759635.73%
1.2247828.66%
1.2521112.65%
1.261498.93%
1.24804.80%
1.21392.34%
1.23261.56%
1.20201.20%
Other694.14%

Qmail Toaster (1,319 servers)

Version Number of Servers Percent
1.31,25094.77%
1.2272.05%
1.03.5151.14%
Other272.05%

Kerio (924 servers)

Version Number of Servers Percent
6.7.318419.91%
6.7.0899.63%
6.6.2879.42%
6.5.0687.36%
6.5.2677.25%
6.7.2566.06%
6.4.1545.84%
6.6.1424.55%
6.3.1414.44%
6.7.1414.44%
6.5.1272.92%
6.4.0232.49%
6.3.0222.38%
6.4.2171.84%
6.6.0141.52%
6.0.10111.19%
6.1.3101.08%
Other717.68%

SurgeSMTP (871 servers)

Version Number of Servers Percent
6.7c-116318.71%
6.5a2-215918.25%
6.5a-1627.12%
6.3c2-2596.77%
5.2a-1313.56%
6.8g-1303.44%
5.3h2-2273.10%
6.4a-1262.99%
6.8h-8242.76%
3.9e-1232.64%
3.8k4-4202.30%
6.1c-1161.84%
6.8c-1161.84%
4.0u4-4131.49%
6.0a5-5111.26%
Other19121.93%

Merak (635 servers)

Version Number of Servers Percent
8.0.321233.39%
8.9.17812.28%
8.5.0497.72%
8.3.8345.35%
7.4.5294.57%
7.6.4284.41%
7.5.2284.41%
7.0.1152.36%
7.6.1132.05%
8.3.15121.89%
9.0.0111.73%
7.4.2101.57%
7.2.0101.57%
8.9.081.26%
6.2.181.26%
8.2.481.26%
Other8212.91%

ArGoSoft (417 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)10725.66%
1.8 (1.8.9.5)6014.39%
1.8 (1.8.9.3)5813.91%
1.8 (1.8.9.1)378.87%
1.8 (1.8.8.7)266.24%
1.8 (1.8.8.8)225.28%
1.8 (1.8.9.4)143.36%
1.8 (1.8.9.2)133.12%
1.8 (1.8.6.0)102.40%
1.8 (1.8.7.3)71.68%
1.8 (1.8.8.9)51.20%
Other5813.91%

MagicMail (274 servers)

Version Number of Servers Percent
Other274100.00%

Post.Office (247 servers)

Version Number of Servers Percent
4.2.24618.62%
3.5.33614.57%
4.1.2.43413.77%
4.1.0.2124.86%
4.1.1124.86%
3.9.2.393.64%
4.2.1.393.64%
4.0.193.64%
3.1.2J62.43%
4.1.0.362.43%
3.5.3J62.43%
4.2.1.162.43%
4.262.43%
3.9.241.62%
3.1.241.62%
3.8.7.441.62%
4.1.2.331.21%
4.331.21%
3.9.1.231.21%
4.1.0.431.21%
3.9.131.21%
Other239.31%

GroupWise (245 servers)

Version Number of Servers Percent
7.0.33313.47%
14.0.12911.84%
8.0.22610.61%
6.5.7249.80%
8.0.3208.16%
7.0.4156.12%
7.0.2135.31%
14.0.0114.49%
12.0.2114.49%
6.5.493.67%
6.5.693.67%
6.0.462.45%
7.0.162.45%
14.0.241.63%
6.5.031.22%
6.5.531.22%
8.0.031.22%
12.0.131.22%
8.0.131.22%
Other145.71%

Gordano Messaging Suite (GMS) (215 servers)

Version Number of Servers Percent
Other215100.00%

OpenSMTPD (192 servers)

Version Number of Servers Percent
Other192100.00%

Trend Micro (154 servers)

Version Number of Servers Percent
5.75938.31%
5.53019.48%
5.182918.83%
7.0127.79%
7.1106.49%
8.542.60%
3.5331.95%
7.521.30%
Other53.25%

InterScan VirusWall (76 servers)

Version Number of Servers Percent
Other76100.00%

Mirapoint (63 servers)

Version Number of Servers Percent
4.3.5-GA914.29%
4.4.3-GA711.11%
4.3.6-GA57.94%
4.4.2a-FCS57.94%
4.1.10-GA46.35%
4.4.5a-GA46.35%
4.4.5-GA34.76%
4.4.4-GA34.76%
3.10.4-GA34.76%
3.10.10a-GA34.76%
4.3.7-GA23.17%
4.3.3-GA23.17%
4.1.5-GA23.17%
3.10.2-GA11.59%
3.8.4-GA11.59%
3.7.3a-GA11.59%
3.8.7a11.59%
3.7.5a-GA11.59%
4.2.3-GA11.59%
4.1.3-GA11.59%
4.1.6-GA11.59%
4.1.8-GA11.59%
4.1.9-GA11.59%
3.8.5-GA11.59%
Other00.00%

VisNetic (46 servers)

Version Number of Servers Percent
9.3.2.01021.74%
9.1.4.1613.04%
8.5.0.848.70%
6.2.2.048.70%
5.3.5.024.35%
9.1.4.024.35%
7.2.4.124.35%
7.6.1.024.35%
5.5.8.324.35%
5.0.2.324.35%
5.8.6.612.17%
9.1.4.1 provided by Techfount Systems Pte Ltd12.17%
7.2.4.012.17%
5.0.2.012.17%
8.3.0.112.17%
5.4.512.17%
8.0.3.112.17%
8.5.0.512.17%
8.0.312.17%
5.4.5.412.17%
Other00.00%

Mercury (27 servers)

Version Number of Servers Percent
1.481451.85%
3.321140.74%
3.2113.70%
4.x13.70%
Other00.00%

Interscan (21 servers)

Version Number of Servers Percent
3.81-Build_1022523.81%
3.81-Build_1084314.29%
3.55 (build 1016)314.29%
3.55 (build 1029)314.29%
3.5 (build 1294)14.76%
3.8-Build_301314.76%
3.55 (build 1020)14.76%
3.53 (build 1493)14.76%
3.53 (build 2013)14.76%
3.53 (build 2017)14.76%
3.8-Build_108014.76%
Other00.00%

OpenVMS (18 servers)

Version Number of Servers Percent
8.3844.44%
7.3633.33%
8.4422.22%
Other00.00%

WebSTAR V (15 servers)

Version Number of Servers Percent
5.4.1746.67%
5.4.0533.33%
5.3.4320.00%
Other00.00%

Neon Mail Server (12 servers)

Version Number of Servers Percent
3.0.7433.33%
3.1.2216.67%
3.1.4216.67%
3.1.318.33%
3.1.018.33%
3.0.618.33%
3.0.918.33%
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%

NetIQ MailMarshal (8 servers)

Version Number of Servers Percent
6.0.3.8450.00%
5.5.6.5225.00%
5.5.4.17112.50%
5.5.6.7112.50%
Other00.00%

MessageWall (6 servers)

Version Number of Servers Percent
1.0.86100.00%
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%

WebSTAR (3 servers)

Version Number of Servers Percent
Other3100.00%



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