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Mail (MX) Server Survey
January 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 Queried2,456,033   100.0%
Number of Servers that didn't respond439,50417.89%
    Server didn't open socket429,91417.50%
    Server didn't provide banner9,5900.39%
Server provided banner2,016,52982.11%
Server banner identifies software in use1,136,97246.29%

As indicated by the above table, of the 2,456,033 servers queried, only 1,136,972 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
Exim591,71752.04%
Postfix346,05330.44%
Sendmail90,9868.00%
Microsoft39,0343.43%
MailEnable30,4042.67%
MDaemon18,7831.65%
IMail4,6690.41%
Lotus Domino2,7950.25%
CommuniGate Pro2,7130.24%
WinWebMail2,1610.19%
XMail1,6900.15%
Qmail Toaster1,3560.12%
Kerio9640.08%
SurgeSMTP8850.08%
Merak6710.06%
ArGoSoft4060.04%
MagicMail2740.02%
GroupWise2570.02%
Post.Office2570.02%
Gordano Messaging Suite (GMS)2200.02%
OpenSMTPD1770.02%
Trend Micro1640.01%
InterScan VirusWall820.01%
Mirapoint710.01%
VisNetic530.00%
Mercury260.00%
Interscan220.00%
OpenVMS180.00%
WebSTAR V160.00%
Neon Mail Server140.00%
ModusMail100.00%
NetIQ MailMarshal100.00%
MessageWall70.00%
MAILsweeper40.00%
WebSTAR30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (591,717 servers)

Version Number of Servers Percent
4.82291,69149.30%
4.84187,82731.74%
4.80.123,0263.89%
4.8022,7983.85%
4.7619,0043.21%
4.7216,6902.82%
4.699,2861.57%
4.776,1921.05%
Other15,2032.57%

Postfix (346,053 servers)

Version Number of Servers Percent
Other346,053100.00%

Sendmail (90,986 servers)

Version Number of Servers Percent
8.13.820,26322.27%
8.14.518,78620.65%
8.14.415,05416.55%
8.13.111,68612.84%
8.14.36,5707.22%
8.12.11.200603082,3522.59%
8.13.6.200606142,1942.41%
8.14.71,9962.19%
8.14.21,2601.38%
8.14.91,2251.35%
8.11.61,0921.20%
8.12.101,0311.13%
8.14.19211.01%
Other6,5567.21%

Microsoft (39,034 servers)

Version Number of Servers Percent
6.0.3790.467529,99976.85%
6.0.3790.39593,2768.39%
7.5.7601.175142,3195.94%
6.0.3790.18308822.26%
7.0.6002.182644541.16%
5.0.2195.73814121.06%
Other1,6924.33%

MailEnable (30,404 servers)

Version Number of Servers Percent
1.986--2,5858.50%
6.5--2,1877.19%
5.10--1,3084.30%
8.04--1,0613.49%
8.51--9673.18%
4.26--9473.11%
6.0--9243.04%
8.00--8142.68%
7.06--8132.67%
8.50--7872.59%
8.55--6021.98%
8.53--5651.86%
7.07--5241.72%
1.981--4851.60%
7.50--4761.57%
7.0--4711.55%
6.57--4551.50%
7.53--4451.46%
6.70--4321.42%
8.55--8.553631.19%
Other13,19343.39%

MDaemon (18,783 servers)

Version Number of Servers Percent
14.5.21,8309.74%
14.0.31,3136.99%
11.0.31,0505.59%
11.0.09475.04%
13.0.48674.62%
13.5.17864.18%
13.0.57824.16%
14.0.26973.71%
14.5.06133.26%
14.5.15673.02%
10.0.04882.60%
12.5.64802.56%
13.6.23812.03%
10.1.23802.02%
12.5.43431.83%
10.1.13291.75%
13.6.03131.67%
14.0.02831.51%
13.5.22771.47%
10.1.02751.46%
9.6.12731.45%
13.0.32521.34%
9.6.62511.34%
13.0.22471.32%
9.6.22421.29%
13.6.12151.14%
Other4,30222.90%

IMail (4,669 servers)

Version Number of Servers Percent
12.3.0.10057112.23%
8.2253911.54%
12.4.2.273657.82%
9.232956.32%
12.2.0.2352876.15%
11.52545.44%
8.152244.80%
12.4.1.152144.58%
8.051934.13%
12.5.0.2461934.13%
11.011352.89%
11.031342.87%
12.4.0.1661302.78%
12.4.1.9921.97%
11.02841.80%
7.15821.76%
10.02741.58%
12.1.0.270721.54%
6.06661.41%
7.07651.39%
8.00571.22%
Other54311.63%

Lotus Domino (2,795 servers)

Version Number of Servers Percent
8.5.344816.03%
8.5.3FP62448.73%
8.5.21545.51%
8.5.3FP31164.15%
8.5.11124.01%
7.0.21093.90%
8.5.3FP2973.47%
8.5.3FP4893.18%
8.5.3FP5832.97%
8.5802.86%
8.5.2FP4782.79%
8.5.2FP2752.68%
8.5.3FP1722.58%
8.5.2FP3682.43%
7.0.3572.04%
8.5.1FP5481.72%
7.0441.57%
8.0.1391.40%
6.5.3391.40%
8.0.2381.36%
8.0371.32%
7.0.1361.29%
6.5.4351.25%
6.5.1351.25%
8.5.2FP1331.18%
6.5321.14%
Other49717.78%

CommuniGate Pro (2,713 servers)

Version Number of Servers Percent
5.1.1627710.21%
6.0.92659.77%
6.0.101947.15%
6.0.71104.05%
6.0.8973.58%
5.2.20943.46%
5.4.11863.17%
4.1.8772.84%
6.0.5692.54%
5.3.13592.17%
5.0.14552.03%
5.2.19471.73%
4.2.10471.73%
5.2.3461.70%
5.1.12421.55%
5.4.4371.36%
5.3.15361.33%
5.2.16361.33%
5.4.1341.25%
6.0.1331.22%
5.4.8331.22%
5.4.6321.18%
5.4.10321.18%
Other87532.25%

WinWebMail (2,161 servers)

Version Number of Servers Percent
3.8.1.338417.77%
3.8.0.11979.12%
3.7.6.11868.61%
3.9.0.11637.54%
3.9.0.71627.50%
3.8.1.51285.92%
3.8.1.11165.37%
3.7.3.11135.23%
3.8.5.11125.18%
3.8.6.11074.95%
3.7.7.3914.21%
3.7.1.1673.10%
3.8.2.1592.73%
3.8.3.1391.80%
3.7.5.1381.76%
3.9.0.5351.62%
3.8.3.3271.25%
3.7.0.3241.11%
3.7.0.5221.02%
Other914.21%

XMail (1,690 servers)

Version Number of Servers Percent
1.2759835.38%
1.2247828.28%
1.2522413.25%
1.261528.99%
1.24824.85%
1.21422.49%
1.23251.48%
1.20171.01%
Other724.26%

Qmail Toaster (1,356 servers)

Version Number of Servers Percent
1.31,28594.76%
1.2302.21%
1.03.5161.18%
Other251.84%

Kerio (964 servers)

Version Number of Servers Percent
6.7.318519.19%
6.7.09810.17%
6.6.2919.44%
6.5.2727.47%
6.5.0697.16%
6.7.2586.02%
6.4.1565.81%
6.3.1454.67%
6.7.1424.36%
6.6.1404.15%
6.5.1262.70%
6.4.0242.49%
6.3.0232.39%
6.4.2222.28%
6.6.0161.66%
6.2.0111.14%
6.1.3101.04%
6.0.10101.04%
Other666.85%

SurgeSMTP (885 servers)

Version Number of Servers Percent
6.5a2-218020.34%
6.7c-113315.03%
6.5a-1697.80%
6.3c2-2637.12%
5.2a-1343.84%
6.4a-1343.84%
5.3h2-2273.05%
3.9e-1252.82%
3.8k4-4212.37%
6.1c-1212.37%
6.8c-1192.15%
6.7f-2171.92%
4.0u4-4161.81%
6.0a5-5121.36%
6.7a-1101.13%
6.8e-191.02%
Other19522.03%

Merak (671 servers)

Version Number of Servers Percent
8.0.322833.98%
8.9.19013.41%
8.5.0487.15%
8.3.8375.51%
7.5.2324.77%
7.4.5314.62%
7.6.4294.32%
7.0.1162.38%
7.6.1131.94%
9.0.0111.64%
8.3.15111.64%
7.2.0101.49%
8.9.0101.49%
8.2.491.34%
7.4.291.34%
6.2.181.19%
7.1.671.04%
Other7210.73%

ArGoSoft (406 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)10425.62%
1.8 (1.8.9.3)6315.52%
1.8 (1.8.9.5)5613.79%
1.8 (1.8.9.1)368.87%
1.8 (1.8.8.7)276.65%
1.8 (1.8.8.8)235.67%
1.8 (1.8.9.2)153.69%
1.8 (1.8.9.4)112.71%
1.8 (1.8.6.0)81.97%
1.8 (1.8.7.3)71.72%
1.8 (1.8.8.9)61.48%
Other5012.32%

MagicMail (274 servers)

Version Number of Servers Percent
Other274100.00%

GroupWise (257 servers)

Version Number of Servers Percent
7.0.33714.40%
8.0.22810.89%
6.5.72610.12%
8.0.3249.34%
7.0.4197.39%
14.0.1187.00%
14.0.0145.45%
12.0.2124.67%
7.0.2124.67%
6.5.4103.89%
6.5.6103.89%
7.0.162.33%
6.0.451.95%
12.0.141.56%
6.5.541.56%
12.0.031.17%
6.5.231.17%
8.0.031.17%
6.5.031.17%
12.0.331.17%
Other135.06%

Post.Office (257 servers)

Version Number of Servers Percent
4.2.24316.73%
3.5.33614.01%
4.1.2.43413.23%
4.1.1145.45%
4.1.0.2145.45%
4.0.1103.89%
4.2.1.393.50%
3.9.2.393.50%
3.5.3J83.11%
3.1.2J72.72%
4.1.0.372.72%
4.262.33%
4.2.1.162.33%
3.8.7.451.95%
3.9.241.56%
3.1.231.17%
3.5.231.17%
3.5.131.17%
4.1.2.231.17%
3.9.131.17%
4.1.0.431.17%
3.9.1.231.17%
4.1.2.331.17%
Other218.17%

Gordano Messaging Suite (GMS) (220 servers)

Version Number of Servers Percent
Other220100.00%

OpenSMTPD (177 servers)

Version Number of Servers Percent
Other177100.00%

Trend Micro (164 servers)

Version Number of Servers Percent
5.76237.80%
5.53420.73%
5.183118.90%
7.0148.54%
7.1106.10%
8.542.44%
3.5331.83%
Other63.66%

InterScan VirusWall (82 servers)

Version Number of Servers Percent
Other82100.00%

Mirapoint (71 servers)

Version Number of Servers Percent
4.3.5-GA912.68%
4.4.3-GA79.86%
4.3.6-GA57.04%
4.4.2a-FCS57.04%
4.4.5-GA45.63%
4.1.10-GA45.63%
4.4.4-GA34.23%
4.3.7-GA34.23%
3.10.10a-GA34.23%
3.8.5-GA34.23%
3.10.4-GA34.23%
4.4.4b-GA22.82%
4.1.5-GA22.82%
4.4.5a-GA22.82%
3.10.7-GA22.82%
4.3.3-GA22.82%
4.1.9-GA22.82%
3.8.4-GA11.41%
3.7.3a-GA11.41%
3.8.7a11.41%
3.10.2-GA11.41%
4.2.4-GA11.41%
4.2.3-GA11.41%
3.7.5a-GA11.41%
4.1.6-GA11.41%
4.1.3-GA11.41%
4.1.8-GA11.41%
Other00.00%

VisNetic (53 servers)

Version Number of Servers Percent
9.3.2.01426.42%
9.1.4.1611.32%
6.2.2.047.55%
8.5.0.847.55%
7.2.4.147.55%
5.8.6.635.66%
5.5.8.323.77%
7.6.1.023.77%
9.1.4.023.77%
5.0.2.323.77%
5.3.5.023.77%
8.5.0.511.89%
8.3.0.111.89%
8.0.311.89%
5.4.5.411.89%
8.3.5.011.89%
5.4.511.89%
5.0.2.011.89%
9.1.4.1 provided by Techfount Systems Pte Ltd11.89%
Other00.00%

Mercury (26 servers)

Version Number of Servers Percent
1.481453.85%
3.321038.46%
3.2113.85%
4.x13.85%
Other00.00%

Interscan (22 servers)

Version Number of Servers Percent
3.81-Build_1022522.73%
3.81-Build_1084313.64%
3.55 (build 1016)313.64%
3.55 (build 1029)313.64%
3.53 (build 1493)29.09%
3.5 (build 1294)14.55%
3.8-Build_301314.55%
3.55 (build 1020)14.55%
3.53 (build 2013)14.55%
3.53 (build 2017)14.55%
3.8-Build_108014.55%
Other00.00%

OpenVMS (18 servers)

Version Number of Servers Percent
8.3738.89%
7.3633.33%
8.4422.22%
8.215.56%
Other00.00%

WebSTAR V (16 servers)

Version Number of Servers Percent
5.4.1637.50%
5.4.0531.25%
5.3.4318.75%
5.3.316.25%
5.3.216.25%
Other00.00%

Neon Mail Server (14 servers)

Version Number of Servers Percent
3.0.7428.57%
3.1.4321.43%
3.1.2214.29%
3.1.0214.29%
3.1.317.14%
3.0.617.14%
3.0.917.14%
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 (10 servers)

Version Number of Servers Percent
6.0.3.8550.00%
5.5.6.5220.00%
5.5.5.6110.00%
5.5.4.17110.00%
5.5.6.7110.00%
Other00.00%

MessageWall (7 servers)

Version Number of Servers Percent
1.0.87100.00%
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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