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Mail (MX) Server Survey
June 1st, 2016

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 Queried2,189,222   100.0%
Number of Servers that didn't respond380,48617.38%
    Server didn't open socket372,44217.01%
    Server didn't provide banner8,0440.37%
Server provided banner1,808,73682.62%
Server banner identifies software in use1,083,78649.51%

As indicated by the above table, of the 2,189,222 servers queried, only 1,083,786 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
Exim596,75855.06%
Postfix349,96032.29%
Sendmail63,9225.90%
MailEnable26,5822.45%
Microsoft17,5981.62%
MDaemon15,2441.41%
IMail2,9700.27%
CommuniGate Pro2,0770.19%
Lotus Domino1,5870.15%
WinWebMail1,4290.13%
XMail1,2830.12%
Qmail Toaster9980.09%
SurgeSMTP7630.07%
Kerio6380.06%
Merak3990.04%
ArGoSoft2810.03%
OpenSMTPD2550.02%
MagicMail2300.02%
Post.Office1970.02%
GroupWise1620.01%
Gordano Messaging Suite (GMS)1590.01%
Trend Micro970.01%
InterScan VirusWall520.00%
Mirapoint370.00%
VisNetic330.00%
OpenVMS150.00%
Mercury130.00%
ModusMail110.00%
WebSTAR V100.00%
Interscan90.00%
Neon Mail Server70.00%
MessageWall50.00%
NetIQ MailMarshal30.00%
WebSTAR10.00%
MAILsweeper10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (596,758 servers)

Version Number of Servers Percent
4.87278,85446.73%
4.86192,14632.20%
4.8528,5764.79%
4.8415,5992.61%
4.8014,9632.51%
4.7214,1452.37%
4.7610,9711.84%
4.829,8891.66%
4.80.18,9561.50%
4.86.26,2171.04%
Other16,4422.76%

Postfix (349,960 servers)

Version Number of Servers Percent
Other349,960100.00%

Sendmail (63,922 servers)

Version Number of Servers Percent
8.14.514,45522.61%
8.14.413,02620.38%
8.13.812,42619.44%
8.13.17,46011.67%
8.14.33,7285.83%
8.14.91,8772.94%
8.14.71,4442.26%
8.15.21,4302.24%
8.12.11.200603081,2721.99%
8.14.27171.12%
Other6,0879.52%

MailEnable (26,582 servers)

Version Number of Servers Percent
8.60--2,1668.15%
9.00--2,0557.73%
6.5--1,4785.56%
8.53--1,4565.48%
1.986--1,2294.62%
8.51--1,0043.78%
8.04--7442.80%
5.10--6542.46%
8.60-8.60-6062.28%
8.50--6062.28%
8.00--5041.90%
4.26--4841.82%
7.06--4401.66%
6.0--4331.63%
7.0--3211.21%
7.07--2911.09%
7.50--2821.06%
9.12--9.122781.05%
8.55--2731.03%
Other11,27842.43%

Microsoft (17,598 servers)

Version Number of Servers Percent
6.0.3790.467512,12268.88%
7.5.7601.175141,5368.73%
6.0.3790.39591,4188.06%
8.5.9600.163845953.38%
6.0.3790.18303572.03%
7.0.6002.182643061.74%
8.0.9200.163842471.40%
5.0.2195.73811991.13%
5.0.2195.53291901.08%
Other6283.57%

MDaemon (15,244 servers)

Version Number of Servers Percent
16.0.11,5219.98%
15.5.31,0666.99%
16.0.28095.31%
15.0.37554.95%
13.5.16844.49%
11.0.36814.47%
11.0.06334.15%
13.0.45903.87%
13.0.55833.82%
15.5.24022.64%
13.6.33602.36%
12.5.63292.16%
16.0.03092.03%
12.5.42921.92%
10.0.02891.90%
10.1.22491.63%
14.5.22431.59%
15.5.12401.57%
10.1.11791.17%
10.1.01781.17%
14.0.31771.16%
9.6.11561.02%
14.5.31531.00%
9.6.61531.00%
Other4,21327.64%

IMail (2,970 servers)

Version Number of Servers Percent
12.5.4.14646815.76%
12.5.3.932849.56%
8.222819.46%
12.4.1.152247.54%
9.232056.90%
8.151595.35%
12.3.0.1001565.25%
8.051324.44%
11.03862.90%
11.5812.73%
12.2.0.235591.99%
12.5.3.99571.92%
12.5.1.60551.85%
7.07501.68%
11.02481.62%
12.5.2.62471.58%
12.4.1.9441.48%
7.15401.35%
10.02381.28%
11.01321.08%
12.1.0.270301.01%
6.06301.01%
Other36412.26%

CommuniGate Pro (2,077 servers)

Version Number of Servers Percent
5.1.1621710.45%
6.1.10984.72%
6.1.8944.53%
6.0.11924.43%
6.1.9803.85%
6.0.9793.80%
5.4.11733.51%
5.2.20693.32%
6.1.5653.13%
6.1.7643.08%
6.1.2532.55%
6.0.10462.21%
6.1.6452.17%
5.3.13442.12%
5.0.14422.02%
5.3.15401.93%
5.2.3381.83%
4.1.8371.78%
6.0.7331.59%
6.1.4291.40%
5.2.16281.35%
5.4.8251.20%
5.4.6211.01%
5.1.12211.01%
Other64431.01%

Lotus Domino (1,587 servers)

Version Number of Servers Percent
8.5.3FP625315.94%
8.5.322514.18%
8.5.2734.60%
8.5.1633.97%
7.0.2573.59%
8.5493.09%
8.5.3FP2483.02%
8.5.3FP3442.77%
8.5.2FP3412.58%
8.5.2FP4382.39%
8.5.3FP4382.39%
8.5.3FP5332.08%
8.5.3FP1322.02%
7.0.3291.83%
8.5.2FP2291.83%
8.0.1271.70%
7.0271.70%
6.5.1251.58%
7.0.1241.51%
8.5.1FP5231.45%
8.0231.45%
6.5.4201.26%
6.5191.20%
8.5.2FP1191.20%
6.5.3181.13%
8.0.2161.01%
Other29418.53%

WinWebMail (1,429 servers)

Version Number of Servers Percent
3.9.0.730821.55%
3.8.1.324216.93%
3.7.6.11117.77%
3.9.0.11037.21%
3.8.0.11007.00%
3.8.1.5765.32%
3.7.3.1634.41%
3.8.1.1584.06%
3.8.5.1563.92%
3.7.7.3533.71%
3.8.6.1463.22%
3.7.1.1372.59%
3.8.2.1352.45%
3.8.3.1221.54%
3.7.5.1211.47%
3.8.3.3171.19%
3.7.0.5161.12%
Other654.55%

XMail (1,283 servers)

Version Number of Servers Percent
1.2753641.78%
1.2235427.59%
1.2513710.68%
1.261068.26%
1.24564.36%
1.21292.26%
1.23151.17%
1.20131.01%
Other372.88%

Qmail Toaster (998 servers)

Version Number of Servers Percent
1.392993.09%
1.2151.50%
1.03151.50%
1.03.5131.30%
Other262.61%

SurgeSMTP (763 servers)

Version Number of Servers Percent
7.1e-122128.96%
6.5a2-2749.70%
6.9c-1638.26%
6.7c-1435.64%
7.0c2-2425.50%
6.5a-1303.93%
6.3c2-2233.01%
3.9e-1212.75%
6.4a-1182.36%
5.2a-1172.23%
6.1c-1162.10%
3.8k4-4131.70%
7.1f-46131.70%
5.3h2-2111.44%
7.1f-3291.18%
7.1f-991.18%
4.0u4-491.18%
Other13117.17%

Kerio (638 servers)

Version Number of Servers Percent
6.7.314122.10%
6.7.06910.82%
6.6.2517.99%
6.5.2507.84%
6.5.0416.43%
6.7.2385.96%
6.4.1294.55%
6.6.1294.55%
6.3.1253.92%
6.7.1253.92%
6.5.1223.45%
6.4.0182.82%
6.3.0162.51%
6.6.0132.04%
6.1.391.41%
6.4.271.10%
6.2.071.10%
Other487.52%

Merak (399 servers)

Version Number of Servers Percent
8.0.313132.83%
8.9.16015.04%
8.5.0287.02%
8.3.8215.26%
7.5.2194.76%
7.4.5194.76%
7.6.4164.01%
7.6.1123.01%
8.3.15102.51%
7.0.192.26%
7.2.071.75%
6.1.051.25%
8.9.051.25%
7.4.251.25%
6.0.841.00%
Other4812.03%

ArGoSoft (281 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)8831.32%
1.8 (1.8.9.5)3813.52%
1.8 (1.8.9.1)3111.03%
1.8 (1.8.9.3)3010.68%
1.8 (1.8.8.7)134.63%
1.8 (1.8.8.8)134.63%
1.8 (1.8.9.2)72.49%
1.8 (1.8.6.0)62.14%
1.8 (1.8.9.4)62.14%
1.8 (1.8.7.3)62.14%
1.8 (1.8.8.9)41.42%
1.8 (1.8.7.6)31.07%
1.8 (1.8.9.0)31.07%
1.8 (1.8.5.9)31.07%
1.8 (1.8.8.4)31.07%
Other279.61%

OpenSMTPD (255 servers)

Version Number of Servers Percent
Other255100.00%

MagicMail (230 servers)

Version Number of Servers Percent
Other230100.00%

Post.Office (197 servers)

Version Number of Servers Percent
4.2.24422.34%
3.5.32613.20%
4.32311.68%
4.1.2.42311.68%
4.2.1.394.57%
4.2.1.163.05%
3.1.2J63.05%
4.0.152.54%
4.1.152.54%
3.9.2.352.54%
4.242.03%
4.1.0.242.03%
3.8.7.431.52%
3.9.231.52%
3.5.131.52%
4.1.2.331.52%
3.5.3J31.52%
3.1.231.52%
4.1.2.221.02%
3.5.421.02%
3.9.1.221.02%
4.1.0.321.02%
3.6.221.02%
Other94.57%

GroupWise (162 servers)

Version Number of Servers Percent
14.2.03722.84%
14.0.1169.88%
8.0.3148.64%
7.0.3127.41%
6.5.7116.79%
14.0.0106.17%
8.0.284.94%
14.0.274.32%
7.0.263.70%
7.0.453.09%
6.0.442.47%
7.0.142.47%
6.5.631.85%
12.0.331.85%
6.0.321.23%
8.0.121.23%
8.0.021.23%
12.0.121.23%
6.5.421.23%
6.5.521.23%
12.0.421.23%
12.0.021.23%
6.0.221.23%
Other42.47%

Gordano Messaging Suite (GMS) (159 servers)

Version Number of Servers Percent
Other159100.00%

Trend Micro (97 servers)

Version Number of Servers Percent
5.73738.14%
5.51919.59%
5.181717.53%
7.01111.34%
7.133.09%
8.533.09%
3.5322.06%
7.522.06%
7.1.11.03%
8.5.211.03%
811.03%
Other00.00%

InterScan VirusWall (52 servers)

Version Number of Servers Percent
Other52100.00%

Mirapoint (37 servers)

Version Number of Servers Percent
4.4.3-GA718.92%
4.3.5-GA410.81%
4.4.5-GA410.81%
4.4.2a-FCS38.11%
4.3.6-GA38.11%
4.1.10-GA25.41%
4.4.7-GA25.41%
4.4.4-GA25.41%
3.10.10a-GA25.41%
4.3.3-GA25.41%
4.4.5a-GA12.70%
4.1.9-GA12.70%
3.7.5a-GA12.70%
3.8.4-GA12.70%
3.10.2-GA12.70%
4.4.6-GA12.70%
Other00.00%

VisNetic (33 servers)

Version Number of Servers Percent
9.3.2.0824.24%
9.1.4.1412.12%
5.0.2.339.09%
6.2.2.039.09%
8.5.0.826.06%
5.5.8.326.06%
8.5.0.513.03%
5.8.6.613.03%
8.3.0.113.03%
8.0.3.113.03%
9.1.4.013.03%
7.6.1.013.03%
5.0.2.013.03%
8.0.313.03%
9.1.4.1 provided by Techfount Systems Pte Ltd13.03%
5.3.5.013.03%
7.2.4.113.03%
Other00.00%

OpenVMS (15 servers)

Version Number of Servers Percent
8.4533.33%
8.3533.33%
7.3533.33%
Other00.00%

Mercury (13 servers)

Version Number of Servers Percent
3.32753.85%
1.48430.77%
3.2117.69%
4.x17.69%
Other00.00%

ModusMail (11 servers)

Version Number of Servers Percent
4.35.477.0654.55%
4.1.361.21218.18%
3.2.315.019.09%
4.35.477.819.09%
3.1.302.019.09%
Other00.00%

WebSTAR V (10 servers)

Version Number of Servers Percent
5.4.1660.00%
5.4.0330.00%
5.3.2110.00%
Other00.00%

Interscan (9 servers)

Version Number of Servers Percent
3.81-Build_1084222.22%
3.55 (build 1029)222.22%
3.5 (build 1294)111.11%
3.8-Build_3013111.11%
3.81-Build_1022111.11%
3.8-Build_1080111.11%
3.55 (build 1016)111.11%
Other00.00%

Neon Mail Server (7 servers)

Version Number of Servers Percent
3.1.2228.57%
3.0.7228.57%
3.1.0228.57%
3.1.4114.29%
Other00.00%

MessageWall (5 servers)

Version Number of Servers Percent
1.0.85100.00%
Other00.00%

NetIQ MailMarshal (3 servers)

Version Number of Servers Percent
5.5.6.5133.33%
5.5.6.7133.33%
6.0.3.8133.33%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

MAILsweeper (1 servers)

Version Number of Servers Percent
4.3.20.01100.00%
Other00.00%




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