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Mail (MX) Server Survey
January 1st, 2017

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 Queried2,020,506   100.0%
Number of Servers that didn't respond359,98017.82%
    Server didn't open socket352,18317.43%
    Server didn't provide banner7,7970.39%
Server provided banner1,660,52682.18%
Server banner identifies software in use1,007,75449.88%

As indicated by the above table, of the 2,020,506 servers queried, only 1,007,754 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
Exim559,60955.53%
Postfix333,49433.09%
Sendmail53,6605.32%
MailEnable23,8152.36%
MDaemon13,5101.34%
Microsoft12,2231.21%
IMail2,2900.23%
CommuniGate Pro1,8980.19%
Lotus Domino1,1930.12%
WinWebMail1,1890.12%
XMail1,1060.11%
Qmail Toaster8760.09%
SurgeSMTP6900.07%
Kerio4960.05%
Merak3110.03%
OpenSMTPD2940.03%
MagicMail2620.03%
ArGoSoft2190.02%
Post.Office1640.02%
Gordano Messaging Suite (GMS)1210.01%
GroupWise1130.01%
Trend Micro740.01%
InterScan VirusWall320.00%
VisNetic310.00%
Mirapoint270.00%
OpenVMS140.00%
ModusMail90.00%
WebSTAR V70.00%
Mercury70.00%
MessageWall60.00%
Interscan60.00%
Neon Mail Server40.00%
WebSTAR20.00%
MAILsweeper10.00%
NetIQ MailMarshal10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (559,609 servers)

Version Number of Servers Percent
4.87407,59472.84%
4.8661,43510.98%
4.8420,0023.57%
4.8012,3132.20%
4.859,7991.75%
4.729,7051.73%
4.768,4151.50%
4.827,9161.41%
4.80.16,4941.16%
Other15,9362.85%

Postfix (333,494 servers)

Version Number of Servers Percent
Other333,494100.00%

Sendmail (53,660 servers)

Version Number of Servers Percent
8.14.512,82823.91%
8.14.411,76121.92%
8.13.89,61417.92%
8.13.15,88210.96%
8.14.32,7125.05%
8.15.22,0333.79%
8.14.91,5482.88%
8.14.71,4632.73%
8.12.11.200603088861.65%
8.14.25561.04%
Other4,3778.16%

MailEnable (23,815 servers)

Version Number of Servers Percent
9.00--2,92912.30%
8.60--1,5756.61%
8.53--1,1935.01%
6.5--1,0904.58%
1.986--9053.80%
8.51--8263.47%
8.04--6112.57%
5.10--4832.03%
8.60-8.60-4772.00%
8.50--4601.93%
8.00--3881.63%
6.0--3391.42%
4.26--3311.39%
7.06--3261.37%
9.50--2991.26%
9.12--2961.24%
Other11,28747.39%

MDaemon (13,510 servers)

Version Number of Servers Percent
16.5.11,3069.67%
16.5.21,0707.92%
16.0.41,0287.61%
13.5.15974.42%
11.0.35474.05%
11.0.05323.94%
13.0.45213.86%
13.0.54983.69%
16.5.03942.92%
15.0.33502.59%
13.6.33332.46%
12.5.62872.12%
15.5.32772.05%
12.5.42411.78%
10.0.02351.74%
16.0.12341.73%
14.5.22251.67%
16.0.22181.61%
10.1.22151.59%
15.5.21621.20%
10.1.01421.05%
10.1.11401.04%
Other3,95829.30%

Microsoft (12,223 servers)

Version Number of Servers Percent
6.0.3790.46757,79863.80%
7.5.7601.175141,28010.47%
6.0.3790.39599217.53%
8.5.9600.163846985.71%
6.0.3790.18302612.14%
7.0.6002.182642381.95%
8.0.9200.163842121.73%
5.0.2195.53291771.45%
5.0.2195.73811421.16%
Other4964.06%

IMail (2,290 servers)

Version Number of Servers Percent
12.5.5.11530813.45%
12.5.4.1461998.69%
12.4.1.151968.56%
8.221918.34%
12.5.3.931667.25%
9.231576.86%
8.151205.24%
12.3.0.1001155.02%
8.05873.80%
11.03693.01%
11.5582.53%
7.07371.62%
10.02361.57%
7.15341.48%
11.02341.48%
12.5.1.60331.44%
12.5.3.99311.35%
12.1.0.270301.31%
12.2.0.235281.22%
12.5.2.62241.05%
8.00241.05%
12.4.1.9231.00%
Other29012.66%

CommuniGate Pro (1,898 servers)

Version Number of Servers Percent
5.1.161779.33%
6.1.111296.80%
6.1.121025.37%
6.1.13824.32%
6.1.10814.27%
5.4.11753.95%
5.2.20723.79%
6.0.11713.74%
6.1.2522.74%
6.0.9482.53%
5.3.13432.27%
6.1.8412.16%
6.1.5382.00%
5.2.3361.90%
5.3.15351.84%
5.0.14351.84%
6.1.7311.63%
6.0.10301.58%
4.1.8301.58%
6.1.9231.21%
6.1.4221.16%
5.2.16211.11%
5.1.12211.11%
5.4.5201.05%
Other58330.72%

Lotus Domino (1,193 servers)

Version Number of Servers Percent
8.5.3FP621117.69%
8.5.316914.17%
8.5.2544.53%
8.5.1473.94%
7.0.2413.44%
8.5403.35%
8.5.3FP4363.02%
8.5.2FP3342.85%
8.5.3FP2332.77%
8.5.2FP4312.60%
8.5.3FP3292.43%
8.5.3FP5282.35%
8.5.3FP1262.18%
8.0.1252.10%
7.0.3211.76%
7.0.1211.76%
8.5.2FP2191.59%
8.0191.59%
8.5.1FP5181.51%
7.0161.34%
7.0.4151.26%
6.5.1141.17%
6.5.4121.01%
8.5.2FP1121.01%
Other22218.61%

WinWebMail (1,189 servers)

Version Number of Servers Percent
3.9.0.731826.75%
3.8.1.318415.48%
3.7.6.1867.23%
3.8.0.1847.06%
3.9.0.1806.73%
3.8.1.5594.96%
3.8.1.1524.37%
3.8.5.1484.04%
3.7.3.1463.87%
3.8.6.1403.36%
3.7.7.3363.03%
3.8.2.1292.44%
3.7.1.1231.93%
3.8.3.1231.93%
3.8.3.3131.09%
Other685.72%

XMail (1,106 servers)

Version Number of Servers Percent
1.2746141.68%
1.2233430.20%
1.25988.86%
1.26807.23%
1.24524.70%
1.21252.26%
1.23141.27%
Other423.80%

Qmail Toaster (876 servers)

Version Number of Servers Percent
1.379690.87%
1.03323.65%
1.2141.60%
1.03.5121.37%
Other222.51%

SurgeSMTP (690 servers)

Version Number of Servers Percent
7.1e-118426.67%
7.2a-110114.64%
6.5a2-2598.55%
6.9c-1415.94%
6.7c-1304.35%
6.5a-1273.91%
7.0c2-2273.91%
3.9e-1182.61%
5.2a-1152.17%
6.1c-1142.03%
6.3c2-2142.03%
6.4a-1121.74%
3.8k4-491.30%
4.0u4-491.30%
7.2d-581.16%
7.1f-3271.01%
Other11516.67%

Kerio (496 servers)

Version Number of Servers Percent
6.7.310420.97%
6.7.0499.88%
6.6.2459.07%
6.5.2438.67%
6.5.0346.85%
6.7.2285.65%
6.4.1244.84%
6.6.1244.84%
6.7.1214.23%
6.3.1173.43%
6.3.0163.23%
6.5.1153.02%
6.4.0132.62%
6.1.391.81%
6.6.091.81%
6.2.061.21%
5.7.961.21%
6.0.351.01%
6.1.051.01%
6.4.251.01%
Other183.63%

Merak (311 servers)

Version Number of Servers Percent
8.0.39329.90%
8.9.14313.83%
8.5.0247.72%
7.5.2196.11%
7.4.5185.79%
8.3.8154.82%
7.6.4134.18%
7.6.1123.86%
8.3.1572.25%
7.2.072.25%
7.4.272.25%
6.1.041.29%
8.9.041.29%
6.0.841.29%
Other4113.18%

OpenSMTPD (294 servers)

Version Number of Servers Percent
Other294100.00%

MagicMail (262 servers)

Version Number of Servers Percent
Other262100.00%

ArGoSoft (219 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)7634.70%
1.8 (1.8.9.5)2712.33%
1.8 (1.8.9.1)2410.96%
1.8 (1.8.9.3)188.22%
1.8 (1.8.8.8)83.65%
1.8 (1.8.8.7)73.20%
1.8 (1.8.6.0)62.74%
1.8 (1.8.9.2)62.74%
1.8 (1.8.7.3)62.74%
1.8 (1.8.8.9)41.83%
1.8 (1.8.9.4)41.83%
1.8 (1.8.8.4)31.37%
Other3013.70%

Post.Office (164 servers)

Version Number of Servers Percent
4.2.23722.56%
4.32716.46%
4.1.2.42012.20%
3.5.31810.98%
4.2.1.384.88%
3.9.2.363.66%
3.9.242.44%
4.0.142.44%
4.1.142.44%
3.1.242.44%
3.8.7.431.83%
4.231.83%
4.2.1.131.83%
4.1.2.331.83%
3.5.131.83%
4.1.0.221.22%
4.1.0.321.22%
3.5.421.22%
Other116.71%

Gordano Messaging Suite (GMS) (121 servers)

Version Number of Servers Percent
Other121100.00%

GroupWise (113 servers)

Version Number of Servers Percent
14.2.13026.55%
14.2.01412.39%
6.5.787.08%
14.0.187.08%
14.0.276.19%
14.0.076.19%
8.0.365.31%
7.0.443.54%
7.0.343.54%
8.0.232.65%
7.0.232.65%
12.0.432.65%
12.0.221.77%
6.0.221.77%
12.0.121.77%
6.0.321.77%
Other87.08%

Trend Micro (74 servers)

Version Number of Servers Percent
5.72939.19%
5.181317.57%
5.51216.22%
7.0810.81%
7.545.41%
7.122.70%
3.5322.70%
8.511.35%
8.5.211.35%
9.011.35%
811.35%
Other00.00%

InterScan VirusWall (32 servers)

Version Number of Servers Percent
Other32100.00%

VisNetic (31 servers)

Version Number of Servers Percent
9.3.2.0929.03%
5.8.6.626.45%
5.0.2.326.45%
6.2.2.026.45%
5.5.8.326.45%
9.1.4.126.45%
7.6.1.013.23%
8.5.0.813.23%
9.1.4.1 provided by Techfount Systems Pte Ltd13.23%
5.0.2.013.23%
5.3.5.013.23%
8.5.0.513.23%
8.0.3.113.23%
9.1.4.013.23%
8.3.0.113.23%
7.2.4.013.23%
8.0.313.23%
7.2.4.113.23%
Other00.00%

Mirapoint (27 servers)

Version Number of Servers Percent
4.4.3-GA518.52%
4.4.5-GA414.81%
4.4.2a-FCS311.11%
4.3.5-GA311.11%
4.4.4-GA27.41%
4.4.7-GA27.41%
4.1.10-GA27.41%
4.1.9-GA13.70%
4.4.5a-GA13.70%
4.3.6-GA13.70%
3.10.10a-GA13.70%
3.7.5a-GA13.70%
4.4.6-GA13.70%
Other00.00%

OpenVMS (14 servers)

Version Number of Servers Percent
8.4535.71%
7.3428.57%
8.3428.57%
8.217.14%
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%

WebSTAR V (7 servers)

Version Number of Servers Percent
5.4.1457.14%
5.4.0114.29%
5.3.2114.29%
5.3.4114.29%
Other00.00%

Mercury (7 servers)

Version Number of Servers Percent
3.32457.14%
3.21114.29%
1.48114.29%
4.x114.29%
Other00.00%

MessageWall (6 servers)

Version Number of Servers Percent
1.0.86100.00%
Other00.00%

Interscan (6 servers)

Version Number of Servers Percent
3.81-Build_1022233.33%
3.81-Build_1084116.67%
3.5 (build 1294)116.67%
3.8-Build_3013116.67%
3.8-Build_1080116.67%
Other00.00%

Neon Mail Server (4 servers)

Version Number of Servers Percent
3.1.0250.00%
3.1.2125.00%
3.0.7125.00%
Other00.00%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

MAILsweeper (1 servers)

Version Number of Servers Percent
4.3.20.01100.00%
Other00.00%

NetIQ MailMarshal (1 servers)

Version Number of Servers Percent
5.5.6.71100.00%
Other00.00%



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