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Mail (MX) Server Survey
August 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 Queried1,953,716   100.0%
Number of Servers that didn't respond344,11717.61%
    Server didn't open socket336,84017.24%
    Server didn't provide banner7,2770.37%
Server provided banner1,609,59982.39%
Server banner identifies software in use975,49749.93%

As indicated by the above table, of the 1,953,716 servers queried, only 975,497 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
Exim539,37255.29%
Postfix318,40232.64%
Sendmail55,8395.72%
MailEnable23,4602.40%
Microsoft13,3511.37%
MDaemon13,3201.37%
IMail2,4270.25%
CommuniGate Pro1,9120.20%
Lotus Domino1,2580.13%
WinWebMail1,2310.13%
XMail1,1090.11%
Qmail Toaster8880.09%
SurgeSMTP6810.07%
Kerio5370.06%
Merak3440.04%
OpenSMTPD2550.03%
ArGoSoft2430.02%
MagicMail2270.02%
Post.Office1650.02%
Gordano Messaging Suite (GMS)1190.01%
GroupWise1180.01%
Trend Micro810.01%
InterScan VirusWall340.00%
Mirapoint330.00%
VisNetic320.00%
OpenVMS100.00%
WebSTAR V90.00%
ModusMail90.00%
Neon Mail Server80.00%
Mercury80.00%
Interscan60.00%
MessageWall50.00%
WebSTAR20.00%
NetIQ MailMarshal10.00%
MAILsweeper10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (539,372 servers)

Version Number of Servers Percent
4.87326,46560.53%
4.86110,20520.43%
4.8516,6663.09%
4.8416,2563.01%
4.8013,2452.46%
4.7211,8782.20%
4.769,6391.79%
4.828,7111.62%
4.80.17,7501.44%
Other18,5573.44%

Postfix (318,402 servers)

Version Number of Servers Percent
Other318,402100.00%

Sendmail (55,839 servers)

Version Number of Servers Percent
8.14.513,00123.28%
8.14.411,87021.26%
8.13.810,50318.81%
8.13.16,17111.05%
8.14.33,0665.49%
8.14.91,6372.93%
8.15.21,5932.85%
8.14.71,3602.44%
8.12.11.200603089161.64%
8.14.25971.07%
Other5,1259.18%

MailEnable (23,460 servers)

Version Number of Servers Percent
9.00--2,1068.98%
8.60--1,7467.44%
8.53--1,2725.42%
6.5--1,1815.03%
1.986--1,0034.28%
8.51--8733.72%
8.04--6522.78%
8.60-8.60-5362.28%
5.10--5162.20%
8.50--4822.05%
8.00--4511.92%
4.26--3981.70%
9.12--3761.60%
6.0--3641.55%
7.06--3531.50%
7.0--2661.13%
7.07--2561.09%
7.50--2461.05%
Other10,38344.26%

Microsoft (13,351 servers)

Version Number of Servers Percent
6.0.3790.46758,89666.63%
7.5.7601.175141,2989.72%
6.0.3790.39591,0237.66%
8.5.9600.163845884.40%
6.0.3790.18302672.00%
7.0.6002.182642631.97%
8.0.9200.163842221.66%
5.0.2195.73811411.06%
Other6534.89%

MDaemon (13,320 servers)

Version Number of Servers Percent
16.0.41,61912.15%
13.5.16184.64%
11.0.35924.44%
16.0.25814.36%
11.0.05434.08%
15.5.35334.00%
13.0.45273.96%
15.0.35223.92%
13.0.54993.75%
16.0.34653.49%
16.0.13972.98%
13.6.33312.48%
12.5.62832.12%
10.0.02501.88%
12.5.42411.81%
15.5.22381.79%
10.1.22241.68%
14.5.22081.56%
10.1.11561.17%
10.1.01551.16%
15.5.11511.13%
9.6.11361.02%
Other4,05130.41%

IMail (2,427 servers)

Version Number of Servers Percent
12.5.4.14632813.51%
12.5.3.932168.90%
8.222118.69%
12.4.1.151807.42%
9.231606.59%
8.151315.40%
12.5.5.1151194.90%
12.3.0.1001184.86%
8.051054.33%
11.03733.01%
11.5682.80%
12.2.0.235481.98%
12.5.3.99421.73%
7.07421.73%
11.02411.69%
12.5.1.60371.52%
7.15351.44%
12.5.2.62351.44%
10.02331.36%
12.4.1.9321.32%
12.1.0.270291.19%
8.00261.07%
Other31813.10%

CommuniGate Pro (1,912 servers)

Version Number of Servers Percent
5.1.1619910.41%
6.1.101196.22%
6.1.11924.81%
6.0.11804.18%
6.0.9713.71%
5.2.20703.66%
6.1.8663.45%
5.4.11633.29%
6.1.7512.67%
6.1.2502.62%
6.1.5472.46%
6.1.9462.41%
5.3.13412.14%
5.2.3371.94%
5.0.14371.94%
5.3.15361.88%
6.0.10341.78%
4.1.8311.62%
6.1.6271.41%
6.1.4271.41%
5.2.16261.36%
6.0.7221.15%
5.1.12221.15%
Other61832.32%

Lotus Domino (1,258 servers)

Version Number of Servers Percent
8.5.3FP620816.53%
8.5.318214.47%
8.5.2503.97%
8.5473.74%
8.5.1453.58%
7.0.2413.26%
8.5.3FP2372.94%
8.5.3FP4352.78%
8.5.3FP3352.78%
8.5.2FP4342.70%
8.5.2FP3332.62%
8.5.3FP1292.31%
8.5.2FP2241.91%
8.0.1241.91%
7.0.3241.91%
8.5.3FP5221.75%
7.0.1221.75%
8.5.1FP5211.67%
7.0201.59%
8.0191.51%
8.0.2171.35%
6.5.1171.35%
8.5.2FP1141.11%
6.5.4131.03%
Other24519.48%

WinWebMail (1,231 servers)

Version Number of Servers Percent
3.9.0.728222.91%
3.8.1.320716.82%
3.7.6.1957.72%
3.8.0.1806.50%
3.9.0.1796.42%
3.8.1.5675.44%
3.7.3.1574.63%
3.8.5.1514.14%
3.8.1.1504.06%
3.7.7.3463.74%
3.8.6.1423.41%
3.7.1.1312.52%
3.8.2.1292.36%
3.8.3.1201.62%
3.7.5.1161.30%
3.7.0.5151.22%
3.9.0.5141.14%
3.8.3.3141.14%
Other362.92%

XMail (1,109 servers)

Version Number of Servers Percent
1.2745641.12%
1.2232829.58%
1.251099.83%
1.26857.66%
1.24474.24%
1.21282.52%
1.23141.26%
1.20121.08%
Other302.71%

Qmail Toaster (888 servers)

Version Number of Servers Percent
1.381992.23%
1.03222.48%
1.2141.58%
1.03.5101.13%
Other232.59%

SurgeSMTP (681 servers)

Version Number of Servers Percent
7.1e-121431.42%
6.5a2-2598.66%
6.9c-1456.61%
6.7c-1405.87%
7.0c2-2385.58%
6.5a-1263.82%
3.9e-1182.64%
6.4a-1172.50%
5.2a-1162.35%
7.2a-1162.35%
6.3c2-2152.20%
6.1c-1142.06%
3.8k4-4101.47%
4.0u4-481.17%
7.1f-3281.17%
5.3h2-281.17%
7.1f-971.03%
Other12217.91%

Kerio (537 servers)

Version Number of Servers Percent
6.7.311220.86%
6.7.0519.50%
6.6.2499.12%
6.5.2438.01%
6.5.0376.89%
6.7.2336.15%
6.4.1264.84%
6.7.1244.47%
6.3.1224.10%
6.6.1224.10%
6.3.0173.17%
6.5.1162.98%
6.4.0112.05%
6.6.091.68%
6.1.391.68%
6.2.081.49%
6.4.271.30%
Other417.64%

Merak (344 servers)

Version Number of Servers Percent
8.0.310931.69%
8.9.15215.12%
8.5.0277.85%
7.5.2195.52%
8.3.8174.94%
7.4.5174.94%
7.6.1123.49%
7.6.4123.49%
8.3.1592.62%
7.0.172.03%
7.2.072.03%
7.4.261.74%
8.9.041.16%
6.0.841.16%
6.1.041.16%
Other3811.05%

OpenSMTPD (255 servers)

Version Number of Servers Percent
Other255100.00%

ArGoSoft (243 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)7832.10%
1.8 (1.8.9.5)3514.40%
1.8 (1.8.9.3)2711.11%
1.8 (1.8.9.1)239.47%
1.8 (1.8.8.8)124.94%
1.8 (1.8.9.2)93.70%
1.8 (1.8.8.7)83.29%
1.8 (1.8.7.3)62.47%
1.8 (1.8.6.0)52.06%
1.8 (1.8.9.4)41.65%
1.8 (1.8.8.9)41.65%
1.8 (1.8.8.4)31.23%
1.8 (1.8.8.2)31.23%
1.8 (1.8.7.6)31.23%
Other239.47%

MagicMail (227 servers)

Version Number of Servers Percent
Other227100.00%

Post.Office (165 servers)

Version Number of Servers Percent
4.2.23521.21%
3.5.32213.33%
4.32112.73%
4.1.2.41911.52%
4.2.1.395.45%
3.9.2.363.64%
4.1.153.03%
4.0.153.03%
4.2.1.142.42%
3.1.242.42%
3.1.2J42.42%
3.5.131.82%
3.8.7.431.82%
3.5.3J31.82%
3.9.221.21%
4.1.0.221.21%
4.1.0.321.21%
4.1.2.321.21%
3.6.221.21%
3.5.421.21%
Other106.06%

Gordano Messaging Suite (GMS) (119 servers)

Version Number of Servers Percent
Other119100.00%

GroupWise (118 servers)

Version Number of Servers Percent
14.2.02420.34%
14.0.11210.17%
8.0.386.78%
14.2.186.78%
14.0.075.93%
7.0.375.93%
6.5.775.93%
14.0.265.08%
7.0.465.08%
7.0.243.39%
8.0.243.39%
12.0.332.54%
6.0.332.54%
7.0.132.54%
12.0.221.69%
6.0.221.69%
12.0.121.69%
6.5.421.69%
12.0.421.69%
Other65.08%

Trend Micro (81 servers)

Version Number of Servers Percent
5.72935.80%
5.51518.52%
5.181417.28%
7.0911.11%
7.144.94%
8.533.70%
7.522.47%
3.5322.47%
7.1.11.23%
9.011.23%
811.23%
Other00.00%

InterScan VirusWall (34 servers)

Version Number of Servers Percent
Other34100.00%

Mirapoint (33 servers)

Version Number of Servers Percent
4.4.3-GA618.18%
4.3.5-GA412.12%
4.4.5-GA412.12%
4.4.2a-FCS39.09%
4.3.6-GA39.09%
3.10.10a-GA26.06%
4.4.4-GA26.06%
4.4.7-GA26.06%
4.1.10-GA26.06%
4.1.9-GA13.03%
4.4.5a-GA13.03%
3.7.5a-GA13.03%
4.3.3-GA13.03%
4.4.6-GA13.03%
Other00.00%

VisNetic (32 servers)

Version Number of Servers Percent
9.3.2.01031.25%
9.1.4.139.38%
8.5.0.826.25%
5.5.8.326.25%
6.2.2.026.25%
5.0.2.326.25%
5.8.6.613.12%
8.5.0.513.12%
8.3.0.113.12%
8.0.3.113.12%
9.1.4.013.12%
7.6.1.013.12%
5.0.2.013.12%
8.0.313.12%
9.1.4.1 provided by Techfount Systems Pte Ltd13.12%
5.3.5.013.12%
7.2.4.113.12%
Other00.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4440.00%
7.3330.00%
8.3330.00%
Other00.00%

WebSTAR V (9 servers)

Version Number of Servers Percent
5.4.1666.67%
5.4.0222.22%
5.3.4111.11%
Other00.00%

ModusMail (9 servers)

Version Number of Servers Percent
4.35.477.0555.56%
4.1.361.21222.22%
3.2.315.0111.11%
4.35.477.8111.11%
Other00.00%

Neon Mail Server (8 servers)

Version Number of Servers Percent
3.1.2225.00%
3.0.7225.00%
3.1.0225.00%
3.1.4112.50%
3.0.8112.50%
Other00.00%

Mercury (8 servers)

Version Number of Servers Percent
3.32450.00%
1.48225.00%
3.21112.50%
4.x112.50%
Other00.00%

Interscan (6 servers)

Version Number of Servers Percent
3.81-Build_1084116.67%
3.5 (build 1294)116.67%
3.8-Build_3013116.67%
3.8-Build_1080116.67%
3.81-Build_1022116.67%
3.55 (build 1016)116.67%
Other00.00%

MessageWall (5 servers)

Version Number of Servers Percent
1.0.85100.00%
Other00.00%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

NetIQ MailMarshal (1 servers)

Version Number of Servers Percent
5.5.6.71100.00%
Other00.00%

MAILsweeper (1 servers)

Version Number of Servers Percent
4.3.20.01100.00%
Other00.00%




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