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Mail (MX) Server Survey
September 1st, 2021

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 Queried1,325,590   100.0%
Number of Servers that didn't respond235,94417.80%
    Server didn't open socket232,02717.50%
    Server didn't provide banner3,9170.30%
Server provided banner1,089,64682.20%
Server banner identifies software in use692,45052.24%

As indicated by the above table, of the 1,325,590 servers queried, only 692,450 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
Exim401,62458.00%
Postfix241,79934.92%
Sendmail24,3953.52%
MailEnable13,8372.00%
MDaemon3,9220.57%
Microsoft2,2230.32%
CommuniGate Pro8660.13%
IMail8230.12%
XMail5360.08%
Qmail Toaster5260.08%
OpenSMTPD4180.06%
SurgeSMTP3950.06%
Lotus Domino2570.04%
WinWebMail1970.03%
MagicMail1580.02%
Kerio1040.02%
Merak1040.02%
Post.Office780.01%
GroupWise550.01%
ArGoSoft550.01%
Gordano Messaging Suite (GMS)290.00%
Trend Micro190.00%
OpenVMS110.00%
InterScan VirusWall50.00%
VisNetic40.00%
ModusMail20.00%
Interscan20.00%
MessageWall20.00%
Neon Mail Server10.00%
WebSTAR10.00%
Mirapoint10.00%
Mercury10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (401,624 servers)

Version Number of Servers Percent
4.94.2287,36771.55%
4.9351,70812.87%
4.9412,6433.15%
4.928,7572.18%
4.916,7921.69%
4.92.35,0761.26%
4.894,8611.21%
Other24,4206.08%

Postfix (241,799 servers)

Version Number of Servers Percent
Other241,799100.00%

Sendmail (24,395 servers)

Version Number of Servers Percent
8.15.211,98849.14%
8.14.43,49414.32%
8.14.72,87711.79%
8.13.81,5746.45%
8.14.51,4285.85%
8.16.17523.08%
8.13.14761.95%
8.14.94501.84%
8.14.33021.24%
Other1,0544.32%

MailEnable (13,837 servers)

Version Number of Servers Percent
10.27--3,48225.16%
10.34--2,62218.95%
10.25--8786.35%
9.00--4193.03%
10.31--3102.24%
10.29--2241.62%
10.31-10.31-2181.58%
10.30--1801.30%
9.16--1541.11%
10.31--10.311431.03%
Other5,20737.63%

MDaemon (3,922 servers)

Version Number of Servers Percent
21.0.23749.54%
13.5.12767.04%
21.0.32345.97%
21.0.11624.13%
13.0.51604.08%
19.5.51563.98%
11.0.01483.77%
13.0.41473.75%
11.0.31403.57%
19.5.41353.44%
16.5.21072.73%
12.5.6822.09%
20.0.4771.96%
14.5.2741.89%
20.0.3561.43%
10.0.0491.25%
12.5.4491.25%
10.1.2401.02%
Other1,45637.12%

Microsoft (2,223 servers)

Version Number of Servers Percent
6.0.3790.467579535.76%
8.5.9600.1638435515.97%
7.5.7601.175141938.68%
10.0.14393.41691808.10%
6.0.3790.39591275.71%
10.0.17763.16971245.58%
5.0.2195.5329843.78%
8.0.9200.16384612.74%
10.0.14393.2608452.02%
5.0.2195.6713351.57%
6.0.3790.1830321.44%
10.0.17763.1311.39%
7.0.6002.18264301.35%
Other1315.89%

CommuniGate Pro (866 servers)

Version Number of Servers Percent
6.2.1510912.59%
6.2.14839.58%
6.1.20343.93%
6.0.11323.70%
6.2.12293.35%
5.2.20242.77%
5.4.11222.54%
6.1.16202.31%
6.1.18192.19%
6.3.5192.19%
6.0.9171.96%
6.3.3171.96%
5.1.16151.73%
6.3.6141.62%
6.2.10131.50%
6.3.4121.39%
6.3.7121.39%
5.2.3111.27%
6.2.7101.15%
6.0.7101.15%
6.1.1091.04%
6.1.1191.04%
Other32637.64%

IMail (823 servers)

Version Number of Servers Percent
12.5.8.4114417.50%
12.4.1.159010.94%
12.5.7.598410.21%
12.5.6.101819.84%
9.23465.59%
8.22394.74%
12.5.5.115354.25%
8.05293.52%
12.5.3.93293.52%
12.5.6.105273.28%
12.3.0.100222.67%
10.02222.67%
12.5.4.146192.31%
8.15192.31%
12.5.7.58131.58%
12.5.5.117131.58%
11.5121.46%
7.0791.09%
Other9010.94%

XMail (536 servers)

Version Number of Servers Percent
1.2727851.87%
1.2217232.09%
1.26234.29%
1.25234.29%
1.24183.36%
Other224.10%

Qmail Toaster (526 servers)

Version Number of Servers Percent
1.338473.00%
1.0313425.48%
Other81.52%

OpenSMTPD (418 servers)

Version Number of Servers Percent
Other418100.00%

SurgeSMTP (395 servers)

Version Number of Servers Percent
7.3o4-45614.18%
7.5c-15513.92%
7.5a-1399.87%
7.4o-1379.37%
7.3e2-2235.82%
7.1e-1174.30%
7.4e-1153.80%
7.2i-1112.78%
6.7c-1102.53%
7.5d-2102.53%
7.3i2-292.28%
7.5d-782.03%
6.5a2-271.77%
7.2a-161.52%
6.5a-151.27%
7.5b-2251.27%
3.9e-141.01%
7.4m-141.01%
Other7418.73%

Lotus Domino (257 servers)

Version Number of Servers Percent
8.5.3FP65621.79%
8.5.34015.56%
8.5.1145.45%
8.5.2124.67%
8.5103.89%
7.0.293.50%
7.083.11%
8.5.3FP383.11%
8.5.2FP4HF75962.33%
8.5.2FP351.95%
7.0.351.95%
8.5.2FP251.95%
6.551.95%
8.5.3FP441.56%
7.0.3FP141.56%
6.5.141.56%
8.041.56%
5.0.831.17%
8.0.131.17%
8.5.3FP131.17%
6.5.431.17%
6.5.531.17%
8.5.1FP531.17%
8.5.2FP431.17%
Other3714.40%

WinWebMail (197 servers)

Version Number of Servers Percent
4.2.0.14020.30%
3.9.0.72412.18%
3.8.1.32211.17%
4.3.0.12110.66%
3.9.0.1126.09%
4.1.0.1105.08%
3.7.3.1105.08%
4.0.0.194.57%
3.8.0.184.06%
3.8.1.152.54%
3.8.1.542.03%
3.7.6.131.52%
3.7.7.331.52%
3.9.3.131.52%
3.8.6.131.52%
3.7.1.121.02%
3.9.1.121.02%
3.8.3.121.02%
4.4.0.121.02%
3.8.2.121.02%
Other105.08%

MagicMail (158 servers)

Version Number of Servers Percent
Other158100.00%

Kerio (104 servers)

Version Number of Servers Percent
6.7.32524.04%
6.7.01918.27%
6.6.21211.54%
6.7.287.69%
6.6.176.73%
6.5.054.81%
6.7.154.81%
6.5.243.85%
6.3.021.92%
6.3.121.92%
5.7.921.92%
6.0.521.92%
5.7.621.92%
6.5.121.92%
Other76.73%

Merak (104 servers)

Version Number of Servers Percent
8.9.12927.88%
8.0.32423.08%
7.6.198.65%
7.4.576.73%
9.0.376.73%
8.3.843.85%
7.6.432.88%
7.6.021.92%
7.5.221.92%
7.4.221.92%
8.5.021.92%
6.0.821.92%
Other1110.58%

Post.Office (78 servers)

Version Number of Servers Percent
4.31620.51%
4.41620.51%
4.2.21519.23%
3.5.378.97%
4.1.2.467.69%
4.2.1.333.85%
3.5.133.85%
4.2.1.122.56%
4.211.28%
3.1.2J11.28%
3.1.211.28%
4.111.28%
3.5.3J11.28%
4.1.0.311.28%
4.0.111.28%
4.1.111.28%
3.9.211.28%
4.2.111.28%
Other00.00%

GroupWise (55 servers)

Version Number of Servers Percent
18.2.1814.55%
18.2.0610.91%
18.1.1610.91%
18.1.0610.91%
18.3.159.09%
14.2.247.27%
18.3.035.45%
14.0.035.45%
6.5.723.64%
14.2.323.64%
14.2.123.64%
18.0.211.82%
6.5.211.82%
14.2.011.82%
6.5.011.82%
7.0.111.82%
8.0.311.82%
18.0.011.82%
6.0.411.82%
Other00.00%

ArGoSoft (55 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1629.09%
1.8 (1.8.9.3)814.55%
1.8 (1.8.9.5)610.91%
1.8 (1.8.9.1)47.27%
1.8 (1.8.7.6)23.64%
1.8 (1.8.7.3)23.64%
1.8 (1.8.8.9)23.64%
1.8 (1.8.8.8)23.64%
1.8 (1.8.9.2)23.64%
1.8 (1.8.2.1)23.64%
1.8 (1.8.5.5)11.82%
1.8 (1.8.5.9)11.82%
1.8 (1.8.8.7)11.82%
1.8 (1.8.5.8)11.82%
1.8 (1.8.8.4)11.82%
1.8 (1.8.6.0)11.82%
1.8 (1.8.9.4)11.82%
1.8 (1.8.3.5)11.82%
1.8 (1.8.2.5)11.82%
Other00.00%

Gordano Messaging Suite (GMS) (29 servers)

Version Number of Servers Percent
Other29100.00%

Trend Micro (19 servers)

Version Number of Servers Percent
5.7736.84%
5.18421.05%
5.5210.53%
7.5210.53%
7.5ready15.26%
815.26%
7.015.26%
7.115.26%
Other00.00%

OpenVMS (11 servers)

Version Number of Servers Percent
8.4654.55%
7.3436.36%
8.319.09%
Other00.00%

InterScan VirusWall (5 servers)

Version Number of Servers Percent
Other5100.00%

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0250.00%
8.0.3125.00%
5.0.1125.00%
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 (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
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%

Mercury (1 servers)

Version Number of Servers Percent
41100.00%
Other00.00%



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