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Mail (MX) Server Survey
July 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 Queried1,616,615   100.0%
Number of Servers that didn't respond300,75718.60%
    Server didn't open socket293,87618.18%
    Server didn't provide banner6,8810.43%
Server provided banner1,315,85881.40%
Server banner identifies software in use819,48050.69%

As indicated by the above table, of the 1,616,615 servers queried, only 819,480 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
Exim466,85356.97%
Postfix289,40135.32%
Sendmail30,6403.74%
MailEnable16,9012.06%
MDaemon6,1210.75%
Microsoft3,6270.44%
CommuniGate Pro1,1230.14%
IMail1,1120.14%
XMail6910.08%
Qmail Toaster5420.07%
SurgeSMTP4400.05%
OpenSMTPD4170.05%
WinWebMail4080.05%
Lotus Domino3810.05%
Kerio1640.02%
MagicMail1440.02%
Merak1420.02%
Post.Office1170.01%
ArGoSoft850.01%
GroupWise590.01%
Gordano Messaging Suite (GMS)360.00%
Trend Micro350.00%
OpenVMS90.00%
VisNetic90.00%
InterScan VirusWall70.00%
Mercury40.00%
Interscan30.00%
WebSTAR V30.00%
ModusMail20.00%
MessageWall10.00%
Neon Mail Server10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (466,853 servers)

Version Number of Servers Percent
4.93283,42260.71%
4.9275,46216.16%
4.9123,9725.13%
4.93.0.420,3914.37%
4.92.314,3653.08%
4.877,9451.70%
4.897,7621.66%
4.846,4381.38%
Other27,0965.80%

Postfix (289,401 servers)

Version Number of Servers Percent
Other289,401100.00%

Sendmail (30,640 servers)

Version Number of Servers Percent
8.15.212,99542.41%
8.14.45,43517.74%
8.14.72,9019.47%
8.13.82,6178.54%
8.14.52,1727.09%
8.13.11,4424.71%
8.14.98282.70%
8.14.35361.75%
Other1,7145.59%

MailEnable (16,901 servers)

Version Number of Servers Percent
10.25--4,15624.59%
10.27--3,04318.00%
9.00--7764.59%
10.29--4942.92%
10.12--2741.62%
9.16--2681.59%
8.60--2591.53%
10.29--10.291991.18%
10.29-10.29-1991.18%
10.30--1941.15%
9.00--9.001721.02%
10.20--1711.01%
6.5--1711.01%
8.53--1711.01%
Other6,35437.60%

MDaemon (6,121 servers)

Version Number of Servers Percent
19.5.51,02716.78%
13.5.14246.93%
13.6.33716.06%
13.0.42534.13%
13.0.52433.97%
11.0.32173.55%
11.0.02093.41%
16.5.21782.91%
19.5.41612.63%
12.5.61352.21%
12.5.41252.04%
14.5.21101.80%
19.5.3911.49%
19.0.3801.31%
10.0.0771.26%
10.1.2731.19%
15.0.3701.14%
16.0.4681.11%
10.1.0631.03%
Other2,14635.06%

Microsoft (3,627 servers)

Version Number of Servers Percent
6.0.3790.46751,50441.47%
8.5.9600.1638456215.49%
7.5.7601.1751440111.06%
10.0.14393.26082777.64%
6.0.3790.39592005.51%
10.0.17763.11203.31%
5.0.2195.53291082.98%
8.0.9200.16384832.29%
6.0.3790.1830551.52%
5.0.2195.6713501.38%
7.0.6002.18264481.32%
5.0.2195.7381411.13%
Other1784.91%

CommuniGate Pro (1,123 servers)

Version Number of Servers Percent
6.2.14665.88%
6.2.14.595.25%
6.2.15.494.36%
6.2.15322.85%
5.3.13.302.67%
6.2.12282.49%
6.0.11.252.23%
5.1.16211.87%
5.4.11201.78%
6.1.20.201.78%
6.1.20201.78%
6.0.11191.69%
5.2.20.191.69%
6.2.12.191.69%
6.1.16.181.60%
6.1.16171.51%
5.4.11.171.51%
6.1.18151.34%
6.0.9131.16%
5.2.20121.07%
Other60453.78%

IMail (1,112 servers)

Version Number of Servers Percent
12.5.7.5914613.13%
12.5.6.10112911.60%
12.4.1.1511410.25%
12.5.8.411019.08%
9.23655.85%
12.5.3.93544.86%
8.22534.77%
12.5.5.115443.96%
12.3.0.100433.87%
8.05413.69%
8.15353.15%
11.03272.43%
12.5.4.146252.25%
12.5.6.105232.07%
10.02211.89%
12.5.7.58201.80%
12.5.5.117191.71%
7.15121.08%
8.00121.08%
7.07121.08%
11.5121.08%
Other1049.35%

XMail (691 servers)

Version Number of Servers Percent
1.2735150.80%
1.2222332.27%
1.26365.21%
1.25314.49%
1.24213.04%
Other294.20%

Qmail Toaster (542 servers)

Version Number of Servers Percent
1.339172.14%
1.0313925.65%
1.03.561.11%
Other61.11%

SurgeSMTP (440 servers)

Version Number of Servers Percent
7.3o4-49521.59%
7.4e-15913.41%
7.3e2-2357.95%
7.4m-1286.36%
7.3i2-2214.77%
7.1e-1214.77%
6.5a2-2204.55%
6.7c-1143.18%
7.2a-1122.73%
7.2i-1112.50%
7.0c2-281.82%
3.9e-171.59%
7.4g-161.36%
7.4i-161.36%
6.5a-151.14%
7.4a-151.14%
6.9c-151.14%
4.0u4-451.14%
Other7717.50%

OpenSMTPD (417 servers)

Version Number of Servers Percent
Other417100.00%

WinWebMail (408 servers)

Version Number of Servers Percent
4.2.0.19924.26%
3.9.0.76716.42%
3.8.1.34611.27%
3.9.0.1276.62%
3.8.0.1204.90%
4.1.0.1174.17%
3.7.6.1143.43%
3.7.3.1122.94%
3.8.1.1112.70%
4.0.0.1112.70%
3.8.3.181.96%
3.8.1.581.96%
3.8.5.181.96%
3.9.2.181.96%
3.8.6.171.72%
3.7.7.361.47%
1.051.23%
3.9.5.351.23%
Other297.11%

Lotus Domino (381 servers)

Version Number of Servers Percent
8.5.3FP68121.26%
8.5.34712.34%
8.5.2174.46%
8.5.1164.20%
7.0.2153.94%
8.5123.15%
7.0123.15%
8.5.2FP2123.15%
8.5.3FP392.36%
8.5.2FP392.36%
7.0.382.10%
8.5.3FP482.10%
8.5.3FP571.84%
8.0.171.84%
8.5.3FP171.84%
8.5.2FP4HF75961.57%
8.5.1FP561.57%
8.5.2FP461.57%
6.551.31%
6.5.451.31%
8.051.31%
6.5.351.31%
8.5.3FP251.31%
7.0.3FP151.31%
8.0.241.05%
6.5.541.05%
7.0.441.05%
Other5414.17%

Kerio (164 servers)

Version Number of Servers Percent
6.7.34225.61%
6.7.02615.85%
6.6.2169.76%
6.7.2137.93%
6.7.1106.10%
6.6.1106.10%
6.5.095.49%
6.5.274.27%
6.3.153.05%
6.4.142.44%
6.3.031.83%
6.4.031.83%
5.7.921.22%
5.7.621.22%
6.1.021.22%
6.5.121.22%
6.1.321.22%
Other63.66%

MagicMail (144 servers)

Version Number of Servers Percent
Other144100.00%

Merak (142 servers)

Version Number of Servers Percent
8.9.13726.06%
8.0.33323.24%
7.6.1117.75%
9.0.385.63%
8.5.074.93%
7.4.574.93%
8.3.864.23%
7.6.442.82%
7.5.232.11%
6.0.832.11%
7.4.221.41%
4.4.121.41%
7.6.021.41%
7.0.121.41%
Other1510.56%

Post.Office (117 servers)

Version Number of Servers Percent
4.32924.79%
4.42218.80%
4.2.21815.38%
4.1.2.4108.55%
3.5.386.84%
4.2.1.354.27%
4.0.132.56%
4.2.1.132.56%
3.5.132.56%
3.9.221.71%
4.1.121.71%
Other1210.26%

ArGoSoft (85 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)2529.41%
1.8 (1.8.9.5)1416.47%
1.8 (1.8.9.3)1315.29%
1.8 (1.8.9.1)67.06%
1.8 (1.8.7.3)33.53%
1.8 (1.8.7.6)33.53%
1.8 (1.8.8.8)22.35%
1.8 (1.8.8.9)22.35%
1.8 (1.8.8.7)22.35%
1.8 (1.8.9.2)22.35%
1.8 (1.8.2.1)22.35%
1.8 (1.8.6.1)11.18%
1.8 (1.8.5.5)11.18%
1.8 (1.8.5.8)11.18%
1.8 (1.8.8.4)11.18%
1.8 (1.8.9.0)11.18%
1.8 (1.8.6.0)11.18%
1.8 (1.8.9.4)11.18%
1.8 (1.8.3.5)11.18%
1.8 (1.8.1.1)11.18%
1.8 (1.8.5.9)11.18%
1.8 (1.8.2.5)11.18%
Other00.00%

GroupWise (59 servers)

Version Number of Servers Percent
18.1.1915.25%
14.2.2915.25%
18.2.0711.86%
18.2.158.47%
14.2.146.78%
14.2.346.78%
18.0.246.78%
18.1.046.78%
14.0.123.39%
14.2.023.39%
6.5.711.69%
6.5.011.69%
6.5.511.69%
7.0.111.69%
6.5.211.69%
14.0.011.69%
18.0.011.69%
6.0.211.69%
8.0.211.69%
Other00.00%

Gordano Messaging Suite (GMS) (36 servers)

Version Number of Servers Percent
Other36100.00%

Trend Micro (35 servers)

Version Number of Servers Percent
5.71028.57%
5.181028.57%
5.5514.29%
7.5514.29%
7.025.71%
7.5ready12.86%
812.86%
7.112.86%
Other00.00%

OpenVMS (9 servers)

Version Number of Servers Percent
8.4444.44%
7.3333.33%
8.3111.11%
8.2111.11%
Other00.00%

VisNetic (9 servers)

Version Number of Servers Percent
9.3.2.0777.78%
8.0.3111.11%
6.2.2.0111.11%
Other00.00%

InterScan VirusWall (7 servers)

Version Number of Servers Percent
Other7100.00%

Mercury (4 servers)

Version Number of Servers Percent
1.48250.00%
3.32125.00%
4125.00%
Other00.00%

Interscan (3 servers)

Version Number of Servers Percent
3.8-Build_3013133.33%
3.8-Build_1080133.33%
3.81-Build_1022133.33%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.13100.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
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
4.4.6-GA1100.00%
Other00.00%



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