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Mail (MX) Server Survey
October 1st, 2020

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 Queried1,304,444   100.0%
Number of Servers that didn't respond229,13217.57%
    Server didn't open socket224,82617.24%
    Server didn't provide banner4,3060.33%
Server provided banner1,075,31282.43%
Server banner identifies software in use674,10951.68%

As indicated by the above table, of the 1,304,444 servers queried, only 674,109 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
Exim389,06257.71%
Postfix234,57134.80%
Sendmail24,6703.66%
MailEnable13,7722.04%
MDaemon4,6730.69%
Microsoft2,5970.39%
CommuniGate Pro9440.14%
IMail7890.12%
XMail5340.08%
Qmail Toaster5100.08%
SurgeSMTP3860.06%
OpenSMTPD3600.05%
WinWebMail2920.04%
Lotus Domino2700.04%
MagicMail1390.02%
Kerio1230.02%
Merak1150.02%
Post.Office920.01%
ArGoSoft780.01%
GroupWise520.01%
Gordano Messaging Suite (GMS)280.00%
Trend Micro200.00%
OpenVMS100.00%
VisNetic60.00%
WebSTAR V30.00%
InterScan VirusWall30.00%
Mercury20.00%
ModusMail20.00%
Interscan20.00%
MessageWall10.00%
WebSTAR10.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (389,062 servers)

Version Number of Servers Percent
4.93284,14173.03%
4.9218,4284.74%
4.9117,8464.59%
4.9415,7074.04%
4.92.39,3622.41%
4.93.0.47,3851.90%
4.896,0491.55%
4.875,4851.41%
4.844,7821.23%
Other19,8775.11%

Postfix (234,571 servers)

Version Number of Servers Percent
Other234,571100.00%

Sendmail (24,670 servers)

Version Number of Servers Percent
8.15.211,32245.89%
8.14.44,27117.31%
8.14.72,3339.46%
8.13.82,0018.11%
8.14.51,5696.36%
8.14.97242.93%
8.13.15452.21%
8.14.34091.66%
Other1,4966.06%

MailEnable (13,772 servers)

Version Number of Servers Percent
10.27--3,04422.10%
10.25--2,99821.77%
9.00--5524.01%
10.29--3392.46%
10.30--3252.36%
10.12--2101.52%
9.16--1921.39%
8.60--1741.26%
10.30--10.301691.23%
9.00--9.001471.07%
10.29-10.29-1391.01%
Other5,48339.81%

MDaemon (4,673 servers)

Version Number of Servers Percent
19.5.581917.53%
13.5.12936.27%
13.6.32795.97%
13.0.51843.94%
13.0.41813.87%
11.0.31643.51%
11.0.01573.36%
16.5.21232.63%
12.5.6992.12%
19.5.4931.99%
14.5.2871.86%
12.5.4841.80%
20.0.0831.78%
20.0.1681.46%
10.1.2591.26%
10.0.0561.20%
19.0.3551.18%
19.5.3551.18%
10.1.0531.13%
16.0.4501.07%
15.0.3491.05%
Other1,58233.85%

Microsoft (2,597 servers)

Version Number of Servers Percent
6.0.3790.46751,02739.55%
8.5.9600.1638440215.48%
7.5.7601.1751428010.78%
10.0.14393.26082188.39%
6.0.3790.39591395.35%
10.0.17763.11184.54%
5.0.2195.5329762.93%
8.0.9200.16384642.46%
5.0.2195.6713381.46%
6.0.3790.1830381.46%
7.0.6002.18264351.35%
5.0.2195.7381301.16%
Other1325.08%

CommuniGate Pro (944 servers)

Version Number of Servers Percent
6.2.14879.22%
6.2.15545.72%
6.1.20323.39%
6.0.11282.97%
5.4.11242.54%
6.1.16242.54%
6.2.12242.54%
6.2.15.222.33%
6.2.14.212.22%
5.2.20212.22%
5.3.13212.22%
6.1.18192.01%
5.1.16181.91%
6.0.9131.38%
6.2.13131.38%
5.2.3111.17%
6.1.2101.06%
6.2.9101.06%
6.2.12.101.06%
Other48251.06%

IMail (789 servers)

Version Number of Servers Percent
12.5.7.5910112.80%
12.5.8.419512.04%
12.5.6.1018610.90%
12.4.1.15587.35%
9.23496.21%
8.22435.45%
12.5.3.93364.56%
8.05344.31%
12.3.0.100324.06%
8.15293.68%
12.5.5.115293.68%
11.03202.53%
12.5.6.105182.28%
12.5.5.117151.90%
10.02151.90%
12.5.4.146141.77%
12.5.7.58131.65%
11.591.14%
8.0081.01%
7.0781.01%
Other779.76%

XMail (534 servers)

Version Number of Servers Percent
1.2727852.06%
1.2216931.65%
1.26275.06%
1.25213.93%
1.24163.00%
Other234.31%

Qmail Toaster (510 servers)

Version Number of Servers Percent
1.338274.90%
1.0311622.75%
1.03.571.37%
Other50.98%

SurgeSMTP (386 servers)

Version Number of Servers Percent
7.3o4-46216.06%
7.4o-15313.73%
7.4e-1318.03%
7.3e2-2287.25%
7.3i2-2184.66%
7.1e-1184.66%
6.5a2-2164.15%
7.4m-1133.37%
7.2i-1133.37%
6.7c-1123.11%
7.4p-1892.33%
3.9e-182.07%
7.2a-182.07%
6.5a-161.55%
7.2e-251.30%
7.4q-151.30%
7.4g-151.30%
4.0u4-441.04%
5.0e4-441.04%
7.0c2-241.04%
6.9c-141.04%
Other6015.54%

OpenSMTPD (360 servers)

Version Number of Servers Percent
Other360100.00%

WinWebMail (292 servers)

Version Number of Servers Percent
4.2.0.17726.37%
3.9.0.75017.12%
3.8.1.3268.90%
3.8.0.1175.82%
3.9.0.1144.79%
3.7.6.1103.42%
4.0.0.1103.42%
4.1.0.193.08%
3.7.3.193.08%
3.8.6.172.40%
3.8.3.172.40%
3.9.2.172.40%
3.8.5.162.05%
3.8.1.562.05%
3.8.1.162.05%
1.041.37%
3.7.7.341.37%
3.9.5.341.37%
3.9.3.131.03%
Other165.48%

Lotus Domino (270 servers)

Version Number of Servers Percent
8.5.3FP65319.63%
8.5.33713.70%
8.5.1155.56%
8.5.2114.07%
7.0.2114.07%
8.5.2FP2114.07%
8.582.96%
7.082.96%
8.5.3FP172.59%
8.5.1FP562.22%
7.0.362.22%
8.5.3FP562.22%
8.5.3FP451.85%
6.5.451.85%
8.5.3FP351.85%
8.0.151.85%
8.5.2FP341.48%
7.0.441.48%
6.5.341.48%
6.5.531.11%
7.0.3FP131.11%
5.0.831.11%
8.5.3FP231.11%
8.5.2FP4HF75931.11%
8.5.2FP131.11%
8.5.2FP431.11%
Other3814.07%

MagicMail (139 servers)

Version Number of Servers Percent
Other139100.00%

Kerio (123 servers)

Version Number of Servers Percent
6.7.33024.39%
6.7.01915.45%
6.6.21310.57%
6.6.197.32%
6.7.297.32%
6.7.175.69%
6.5.264.88%
6.5.064.88%
6.4.143.25%
6.3.032.44%
6.3.121.63%
5.7.921.63%
6.4.021.63%
5.7.621.63%
6.5.121.63%
Other75.69%

Merak (115 servers)

Version Number of Servers Percent
8.9.13126.96%
8.0.32824.35%
7.6.1108.70%
7.4.586.96%
8.5.065.22%
8.3.854.35%
9.0.354.35%
7.5.243.48%
7.6.421.74%
6.0.821.74%
Other1412.17%

Post.Office (92 servers)

Version Number of Servers Percent
4.32223.91%
4.42223.91%
4.2.21415.22%
3.5.388.70%
4.1.2.466.52%
4.2.1.144.35%
3.9.222.17%
4.0.122.17%
4.1.0.311.09%
3.1.2J11.09%
3.1.211.09%
4.111.09%
4.2.1.311.09%
3.5.3J11.09%
3.9.1.311.09%
3.6.211.09%
3.5.111.09%
4.1.111.09%
4.1.2.111.09%
4.211.09%
Other00.00%

ArGoSoft (78 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)2532.05%
1.8 (1.8.9.3)1519.23%
1.8 (1.8.9.5)1215.38%
1.8 (1.8.9.1)56.41%
1.8 (1.8.8.8)33.85%
1.8 (1.8.7.3)33.85%
1.8 (1.8.2.1)22.56%
1.8 (1.8.9.2)22.56%
1.8 (1.8.8.9)22.56%
1.8 (1.8.7.6)22.56%
1.8 (1.8.8.7)11.28%
1.8 (1.8.1.7)11.28%
1.8 (1.8.5.8)11.28%
1.8 (1.8.8.4)11.28%
1.8 (1.8.6.1)11.28%
1.8 (1.8.1.1)11.28%
1.8 (1.8.2.5)11.28%
Other00.00%

GroupWise (52 servers)

Version Number of Servers Percent
18.1.1917.31%
18.2.0713.46%
18.2.1611.54%
14.2.159.62%
14.2.247.69%
18.1.047.69%
14.2.335.77%
18.0.235.77%
14.2.023.85%
14.0.123.85%
18.0.011.92%
6.5.411.92%
6.5.011.92%
14.0.011.92%
7.0.111.92%
6.5.711.92%
6.0.211.92%
Other00.00%

Gordano Messaging Suite (GMS) (28 servers)

Version Number of Servers Percent
Other28100.00%

Trend Micro (20 servers)

Version Number of Servers Percent
5.7735.00%
5.18420.00%
5.5315.00%
7.5315.00%
7.5ready15.00%
7.015.00%
7.115.00%
Other00.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4660.00%
7.3220.00%
8.3220.00%
Other00.00%

VisNetic (6 servers)

Version Number of Servers Percent
9.3.2.0466.67%
8.0.3116.67%
6.2.2.0116.67%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.1266.67%
5.3.2133.33%
Other00.00%

InterScan VirusWall (3 servers)

Version Number of Servers Percent
Other3100.00%

Mercury (2 servers)

Version Number of Servers Percent
3.32150.00%
1.48150.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Interscan (2 servers)

Version Number of Servers Percent
3.8-Build_3013150.00%
3.81-Build_1022150.00%
Other00.00%

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Mirapoint (1 servers)

Version Number of Servers Percent
4.4.5-GA1100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%




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