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Mail (MX) Server Survey
June 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 Queried2,419,667   100.0%
Number of Servers that didn't respond440,95118.22%
    Server didn't open socket430,36517.79%
    Server didn't provide banner10,5860.44%
Server provided banner1,978,71681.78%
Server banner identifies software in use1,131,87346.78%

As indicated by the above table, of the 2,419,667 servers queried, only 1,131,873 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
Exim597,43452.78%
Postfix352,97831.19%
Sendmail83,7057.40%
Microsoft31,6662.80%
MailEnable29,7002.62%
MDaemon18,1391.60%
IMail4,1730.37%
CommuniGate Pro2,5450.22%
Lotus Domino2,3750.21%
WinWebMail1,9650.17%
XMail1,6180.14%
Qmail Toaster1,2700.11%
Kerio8740.08%
SurgeSMTP8420.07%
Merak5960.05%
ArGoSoft4020.04%
MagicMail2710.02%
Post.Office2430.02%
GroupWise2180.02%
OpenSMTPD2170.02%
Gordano Messaging Suite (GMS)2100.02%
Trend Micro1460.01%
InterScan VirusWall720.01%
Mirapoint580.01%
VisNetic460.00%
Mercury250.00%
OpenVMS180.00%
WebSTAR V150.00%
Interscan140.00%
Neon Mail Server110.00%
ModusMail90.00%
MessageWall70.00%
NetIQ MailMarshal50.00%
MAILsweeper30.00%
WebSTAR30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (597,434 servers)

Version Number of Servers Percent
4.85344,49757.66%
4.8291,25915.28%
4.8462,16310.40%
4.8020,9293.50%
4.80.119,9303.34%
4.7216,8852.83%
4.7616,5302.77%
4.697,4601.25%
Other17,7812.98%

Postfix (352,978 servers)

Version Number of Servers Percent
Other352,978100.00%

Sendmail (83,705 servers)

Version Number of Servers Percent
8.14.517,93421.43%
8.13.817,92921.42%
8.14.414,87117.77%
8.13.110,42912.46%
8.14.35,8096.94%
8.12.11.200603082,0692.47%
8.14.71,8712.24%
8.14.91,6511.97%
8.13.6.200606141,4321.71%
8.14.21,1131.33%
8.11.69531.14%
8.12.109111.09%
Other6,7338.04%

Microsoft (31,666 servers)

Version Number of Servers Percent
6.0.3790.467523,61974.59%
6.0.3790.39592,5317.99%
7.5.7601.175142,3437.40%
6.0.3790.18307242.29%
7.0.6002.182644431.40%
8.5.9600.163843681.16%
5.0.2195.73813361.06%
Other1,3024.11%

MailEnable (29,700 servers)

Version Number of Servers Percent
1.986--2,1267.16%
6.5--2,0536.91%
8.53--1,3964.70%
8.60--1,0913.67%
8.51--1,0633.58%
5.10--1,0613.57%
8.04--9553.22%
8.60-8.60-7962.68%
4.26--7932.67%
8.50--7762.61%
6.0--7672.58%
8.60--8.607232.43%
8.00--6912.33%
7.06--6722.26%
8.55--4551.53%
7.07--4401.48%
7.0--4131.39%
1.981--4071.37%
6.88-6.88-4031.36%
7.50--4001.35%
6.70--3831.29%
6.57--3811.28%
7.53--3671.24%
8.56--3191.07%
Other10,76936.26%

MDaemon (18,139 servers)

Version Number of Servers Percent
15.0.11,6258.96%
15.0.01,1046.09%
11.0.39915.46%
14.5.39355.15%
11.0.08704.80%
13.5.18664.77%
13.0.48344.60%
14.5.27864.33%
13.0.57454.11%
14.0.36123.37%
12.5.64552.51%
10.0.04222.33%
14.0.24112.27%
10.1.23441.90%
12.5.43261.80%
10.1.13001.65%
13.6.22751.52%
13.6.02491.37%
10.1.02361.30%
9.6.22301.27%
14.5.02291.26%
9.6.12291.26%
9.6.62211.22%
13.0.22181.20%
13.0.32001.10%
13.5.21951.08%
Other4,23123.33%

IMail (4,173 servers)

Version Number of Servers Percent
8.2245911.00%
12.3.0.1003889.30%
12.4.2.273388.10%
9.232626.28%
12.5.1.602566.13%
12.5.2.622235.34%
8.152135.10%
12.4.1.151984.74%
8.051694.05%
12.2.0.2351523.64%
11.51283.07%
11.031212.90%
12.5.0.2461112.66%
12.4.0.166862.06%
7.15791.89%
10.02691.65%
11.02691.65%
11.01671.61%
12.4.1.9631.51%
7.07621.49%
6.06591.41%
8.00521.25%
12.1.0.270471.13%
Other50212.03%

CommuniGate Pro (2,545 servers)

Version Number of Servers Percent
5.1.162459.63%
6.0.91817.11%
6.1.21606.29%
6.0.111405.50%
6.0.10953.73%
5.2.20943.69%
5.4.11903.54%
6.0.7712.79%
6.0.8602.36%
5.3.15572.24%
4.1.8552.16%
5.3.13542.12%
6.0.5501.96%
5.2.3501.96%
5.0.14491.93%
6.1.1471.85%
5.1.12401.57%
4.2.10341.34%
5.4.4341.34%
5.4.8301.18%
5.4.6301.18%
5.2.16301.18%
5.2.19281.10%
5.4.10271.06%
6.0.1261.02%
Other76830.18%

Lotus Domino (2,375 servers)

Version Number of Servers Percent
8.5.334514.53%
8.5.3FP628411.96%
8.5.21154.84%
8.5.1933.92%
8.5.3FP3913.83%
7.0.2823.45%
8.5.2FP4723.03%
8.5.3FP2712.99%
8.5.3FP4642.69%
8.5632.65%
8.5.2FP2622.61%
8.5.3FP5602.53%
8.5.3FP1572.40%
8.5.2FP3572.40%
7.0.3492.06%
8.5.1FP5431.81%
7.0401.68%
8.0.1381.60%
7.0.1351.47%
8.0341.43%
6.5.1321.35%
8.5.2FP1311.31%
6.5.3311.31%
8.0.2271.14%
6.5.4251.05%
Other47419.96%

WinWebMail (1,965 servers)

Version Number of Servers Percent
3.8.1.333717.15%
3.9.0.726513.49%
3.7.6.11799.11%
3.8.0.11658.40%
3.9.0.11226.21%
3.8.1.51085.50%
3.8.1.11065.39%
3.8.5.1995.04%
3.7.3.1944.78%
3.8.6.1854.33%
3.7.7.3783.97%
3.7.1.1552.80%
3.8.2.1482.44%
3.8.3.1301.53%
3.7.5.1291.48%
3.9.0.5261.32%
3.8.3.3261.32%
3.7.0.5221.12%
Other914.63%

XMail (1,618 servers)

Version Number of Servers Percent
1.2760137.14%
1.2246528.74%
1.2519712.18%
1.261408.65%
1.24744.57%
1.21362.22%
1.23221.36%
1.20191.17%
Other643.96%

Qmail Toaster (1,270 servers)

Version Number of Servers Percent
1.31,20494.80%
1.2241.89%
1.03.5151.18%
Other272.13%

Kerio (874 servers)

Version Number of Servers Percent
6.7.318020.59%
6.7.0869.84%
6.6.2819.27%
6.5.2616.98%
6.5.0596.75%
6.7.2515.84%
6.4.1465.26%
6.7.1434.92%
6.6.1404.58%
6.3.1374.23%
6.5.1313.55%
6.3.0232.63%
6.4.0182.06%
6.4.2151.72%
6.6.0141.60%
6.2.0111.26%
6.1.3101.14%
Other687.78%

SurgeSMTP (842 servers)

Version Number of Servers Percent
6.9c-116219.24%
6.7c-112214.49%
6.5a2-212214.49%
6.5a-1576.77%
6.3c2-2333.92%
3.9e-1252.97%
5.3h2-2252.97%
6.4a-1252.97%
5.2a-1232.73%
3.8k4-4192.26%
6.8g-1151.78%
6.1c-1131.54%
4.0u4-4121.43%
6.9d-11111.31%
Other17821.14%

Merak (596 servers)

Version Number of Servers Percent
8.0.319632.89%
8.9.17913.26%
8.5.0488.05%
8.3.8335.54%
7.4.5305.03%
7.5.2305.03%
7.6.4254.19%
7.6.1142.35%
8.3.15122.01%
7.0.1122.01%
9.0.0101.68%
7.4.2101.68%
7.2.091.51%
8.2.471.17%
8.9.071.17%
Other7412.42%

ArGoSoft (402 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)11328.11%
1.8 (1.8.9.3)5714.18%
1.8 (1.8.9.5)5513.68%
1.8 (1.8.9.1)358.71%
1.8 (1.8.8.7)235.72%
1.8 (1.8.8.8)215.22%
1.8 (1.8.9.2)122.99%
1.8 (1.8.9.4)102.49%
1.8 (1.8.6.0)81.99%
1.8 (1.8.7.3)71.74%
1.8 (1.8.8.9)51.24%
Other5613.93%

MagicMail (271 servers)

Version Number of Servers Percent
Other271100.00%

Post.Office (243 servers)

Version Number of Servers Percent
4.2.24618.93%
3.5.33313.58%
4.1.2.43012.35%
4.1.0.2156.17%
4.1.1124.94%
4.2.1.3104.12%
4.3104.12%
4.0.193.70%
3.9.2.383.29%
4.262.47%
3.1.2J62.47%
4.2.1.152.06%
4.1.0.352.06%
3.5.3J52.06%
3.9.141.65%
4.1.2.341.65%
3.8.7.441.65%
3.1.231.23%
3.5.131.23%
3.9.231.23%
Other229.05%

GroupWise (218 servers)

Version Number of Servers Percent
14.0.13415.60%
7.0.32511.47%
8.0.3219.63%
6.5.7219.63%
8.0.2198.72%
7.0.2125.50%
14.0.0125.50%
7.0.4125.50%
12.0.294.13%
7.0.162.75%
6.5.662.75%
14.0.252.29%
6.0.452.29%
6.5.452.29%
12.0.341.83%
6.5.531.38%
8.0.031.38%
Other167.34%

OpenSMTPD (217 servers)

Version Number of Servers Percent
Other217100.00%

Gordano Messaging Suite (GMS) (210 servers)

Version Number of Servers Percent
Other210100.00%

Trend Micro (146 servers)

Version Number of Servers Percent
5.75739.04%
5.182718.49%
5.52617.81%
7.0128.22%
7.1117.53%
8.542.74%
3.5332.05%
7.521.37%
Other42.74%

InterScan VirusWall (72 servers)

Version Number of Servers Percent
Other72100.00%

Mirapoint (58 servers)

Version Number of Servers Percent
4.3.5-GA915.52%
4.4.3-GA610.34%
4.3.6-GA58.62%
4.4.2a-FCS58.62%
4.4.5-GA46.90%
4.1.10-GA46.90%
4.4.4-GA35.17%
4.4.6-GA23.45%
3.8.4-GA23.45%
4.3.3-GA23.45%
4.4.5a-GA23.45%
4.1.5-GA23.45%
4.3.7-GA23.45%
3.10.2-GA11.72%
3.8.7a11.72%
3.10.10a-GA11.72%
4.2.3-GA11.72%
3.7.5a-GA11.72%
4.1.6-GA11.72%
3.10.4-GA11.72%
4.1.9-GA11.72%
4.1.3-GA11.72%
3.8.5-GA11.72%
Other00.00%

VisNetic (46 servers)

Version Number of Servers Percent
9.3.2.01021.74%
9.1.4.1510.87%
6.2.2.048.70%
8.5.0.848.70%
5.8.6.636.52%
5.0.2.324.35%
9.1.4.024.35%
7.2.4.124.35%
7.6.1.024.35%
5.5.8.324.35%
8.0.312.17%
5.0.2.012.17%
9.1.4.1 provided by Techfount Systems Pte Ltd12.17%
7.2.4.012.17%
5.4.5.412.17%
5.4.512.17%
8.0.3.112.17%
8.3.0.112.17%
8.5.0.512.17%
5.3.5.012.17%
Other00.00%

Mercury (25 servers)

Version Number of Servers Percent
1.481248.00%
3.321144.00%
3.2114.00%
4.x14.00%
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
5.4.1640.00%
5.4.0533.33%
5.3.4213.33%
5.3.316.67%
5.3.216.67%
Other00.00%

Interscan (14 servers)

Version Number of Servers Percent
3.55 (build 1016)321.43%
3.81-Build_1084214.29%
3.81-Build_1022214.29%
3.55 (build 1029)214.29%
3.5 (build 1294)17.14%
3.8-Build_301317.14%
3.53 (build 2013)17.14%
3.53 (build 2017)17.14%
3.8-Build_108017.14%
Other00.00%

Neon Mail Server (11 servers)

Version Number of Servers Percent
3.0.7436.36%
3.1.4218.18%
3.1.2218.18%
3.1.0218.18%
3.1.319.09%
Other00.00%

ModusMail (9 servers)

Version Number of Servers Percent
4.35.477.0555.56%
4.1.361.21111.11%
3.2.315.0111.11%
4.35.477.8111.11%
3.1.302.0111.11%
Other00.00%

MessageWall (7 servers)

Version Number of Servers Percent
1.0.87100.00%
Other00.00%

NetIQ MailMarshal (5 servers)

Version Number of Servers Percent
5.5.6.5240.00%
6.0.3.8120.00%
5.5.4.17120.00%
5.5.6.7120.00%
Other00.00%

MAILsweeper (3 servers)

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

WebSTAR (3 servers)

Version Number of Servers Percent
Other3100.00%




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