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Mail (MX) Server Survey
November 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 Queried1,628,378   100.0%
Number of Servers that didn't respond311,30619.12%
    Server didn't open socket303,52518.64%
    Server didn't provide banner7,7810.48%
Server provided banner1,317,07280.88%
Server banner identifies software in use813,74649.97%

As indicated by the above table, of the 1,628,378 servers queried, only 813,746 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
Exim463,78056.99%
Postfix288,88335.50%
Sendmail29,6713.65%
MailEnable16,4362.02%
MDaemon5,7760.71%
Microsoft3,3920.42%
CommuniGate Pro1,1290.14%
IMail1,0550.13%
XMail6680.08%
Qmail Toaster5350.07%
SurgeSMTP4470.05%
OpenSMTPD4380.05%
Lotus Domino3760.05%
WinWebMail3700.05%
Kerio1590.02%
MagicMail1530.02%
Merak1320.02%
Post.Office1100.01%
ArGoSoft800.01%
GroupWise600.01%
Gordano Messaging Suite (GMS)300.00%
Trend Micro280.00%
OpenVMS80.00%
InterScan VirusWall70.00%
VisNetic70.00%
Interscan40.00%
WebSTAR V30.00%
Mercury30.00%
ModusMail20.00%
MessageWall20.00%
WebSTAR10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (463,780 servers)

Version Number of Servers Percent
4.93347,02874.83%
4.9120,6524.45%
4.9420,6384.45%
4.9215,2503.29%
4.92.310,3322.23%
4.93.0.47,5781.63%
4.897,1311.54%
4.876,5271.41%
4.845,5541.20%
Other23,0904.98%

Postfix (288,883 servers)

Version Number of Servers Percent
Other288,883100.00%

Sendmail (29,671 servers)

Version Number of Servers Percent
8.15.213,31744.88%
8.14.45,23917.66%
8.14.72,9649.99%
8.13.82,3868.04%
8.14.52,0156.79%
8.14.97982.69%
8.13.16712.26%
8.14.35001.69%
Other1,7816.00%

MailEnable (16,436 servers)

Version Number of Servers Percent
10.27--3,72622.67%
10.25--3,52821.47%
9.00--6634.03%
10.29--4042.46%
10.30--3412.07%
10.31--2451.49%
9.16--2381.45%
10.12--2331.42%
8.60--1941.18%
10.31--10.311881.14%
9.00--9.001661.01%
Other6,51039.61%

MDaemon (5,776 servers)

Version Number of Servers Percent
19.5.591215.79%
13.5.13816.60%
13.6.33055.28%
13.0.42293.96%
13.0.52183.77%
11.0.32093.62%
11.0.01933.34%
16.5.21602.77%
20.0.21252.16%
12.5.61232.13%
12.5.41212.09%
14.5.21101.90%
19.5.41101.90%
20.0.11051.82%
20.0.0831.44%
10.0.0771.33%
10.1.2701.21%
16.0.4631.09%
10.1.0621.07%
15.0.3611.06%
19.5.3601.04%
19.0.3591.02%
Other1,94033.59%

Microsoft (3,392 servers)

Version Number of Servers Percent
6.0.3790.46751,35439.92%
8.5.9600.1638450814.98%
7.5.7601.1751437110.94%
10.0.14393.26082858.40%
6.0.3790.39591885.54%
10.0.17763.11504.42%
5.0.2195.53291073.15%
8.0.9200.16384912.68%
6.0.3790.1830531.56%
7.0.6002.18264461.36%
5.0.2195.6713421.24%
5.0.2195.7381411.21%
Other1564.60%

CommuniGate Pro (1,129 servers)

Version Number of Servers Percent
6.2.14716.29%
6.2.14.605.31%
6.2.15.524.61%
5.3.13.332.92%
6.2.15322.83%
6.1.20262.30%
6.0.11.252.21%
6.2.12242.13%
6.1.20.232.04%
5.1.16211.86%
6.1.16.211.86%
5.2.20.201.77%
6.2.12.191.68%
6.1.18191.68%
5.4.11181.59%
6.0.11171.51%
6.1.16161.42%
6.3.3121.06%
Other62054.92%

IMail (1,055 servers)

Version Number of Servers Percent
12.5.8.4112511.85%
12.5.7.5912511.85%
12.5.6.10112211.56%
12.4.1.1510710.14%
9.23646.07%
8.22524.93%
12.5.3.93504.74%
12.5.5.115413.89%
8.05413.89%
12.3.0.100383.60%
12.5.6.105282.65%
8.15282.65%
12.5.4.146222.09%
11.03211.99%
10.02211.99%
12.5.5.117181.71%
12.5.7.58171.61%
11.5131.23%
7.15111.04%
8.00111.04%
Other1009.48%

XMail (668 servers)

Version Number of Servers Percent
1.2733550.15%
1.2221932.78%
1.26355.24%
1.25284.19%
1.24233.44%
Other284.19%

Qmail Toaster (535 servers)

Version Number of Servers Percent
1.337369.72%
1.0315128.22%
1.03.561.12%
Other50.93%

SurgeSMTP (447 servers)

Version Number of Servers Percent
7.3o4-47416.55%
7.4o-17115.88%
7.4e-1337.38%
7.3e2-2276.04%
7.1e-1204.47%
7.3i2-2194.25%
7.4q-1184.03%
7.4m-1173.80%
6.5a2-2173.80%
6.7c-1132.91%
7.2i-1132.91%
7.2a-192.01%
3.9e-171.57%
7.4g-161.34%
6.9c-161.34%
4.0u4-451.12%
7.2e-251.12%
6.5a-151.12%
Other8218.34%

OpenSMTPD (438 servers)

Version Number of Servers Percent
Other438100.00%

Lotus Domino (376 servers)

Version Number of Servers Percent
8.5.3FP68522.61%
8.5.34913.03%
8.5.2195.05%
8.5.1174.52%
7.0.2164.26%
8.5133.46%
7.0112.93%
8.5.2FP2112.93%
8.5.3FP382.13%
8.5.3FP582.13%
7.0.371.86%
8.5.3FP171.86%
8.5.1FP571.86%
8.0.161.60%
8.5.3FP461.60%
8.5.2FP4HF75961.60%
6.5.351.33%
6.551.33%
8.051.33%
8.5.2FP351.33%
8.5.2FP451.33%
6.5.451.33%
7.0.441.06%
6.5.141.06%
7.0.3FP141.06%
Other5815.43%

WinWebMail (370 servers)

Version Number of Servers Percent
4.2.0.18422.70%
3.9.0.76718.11%
3.8.1.33910.54%
3.9.0.1256.76%
3.8.0.1184.86%
4.1.0.1154.05%
3.7.3.1112.97%
4.0.0.1102.70%
3.8.5.1102.70%
3.8.1.592.43%
3.7.6.192.43%
3.8.1.192.43%
3.8.6.171.89%
3.8.3.171.89%
3.9.2.171.89%
3.7.7.351.35%
4.3.0.151.35%
1.051.35%
3.9.3.141.08%
3.9.5.341.08%
Other205.41%

Kerio (159 servers)

Version Number of Servers Percent
6.7.34327.04%
6.7.02515.72%
6.6.2148.81%
6.6.1127.55%
6.7.2127.55%
6.7.1106.29%
6.5.085.03%
6.5.274.40%
6.3.153.14%
6.4.042.52%
6.4.142.52%
6.3.031.89%
5.7.921.26%
5.7.621.26%
6.5.121.26%
Other63.77%

MagicMail (153 servers)

Version Number of Servers Percent
Other153100.00%

Merak (132 servers)

Version Number of Servers Percent
8.9.13828.79%
8.0.33123.48%
7.6.196.82%
9.0.386.06%
7.4.564.55%
8.5.064.55%
8.3.864.55%
7.5.243.03%
6.0.832.27%
7.4.221.52%
7.6.421.52%
7.6.021.52%
7.0.121.52%
Other139.85%

Post.Office (110 servers)

Version Number of Servers Percent
4.32724.55%
4.42522.73%
4.2.21715.45%
3.5.398.18%
4.1.2.487.27%
4.2.1.343.64%
4.0.132.73%
4.2.1.132.73%
3.9.221.82%
Other1210.91%

ArGoSoft (80 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)2531.25%
1.8 (1.8.9.3)1316.25%
1.8 (1.8.9.5)1113.75%
1.8 (1.8.9.1)67.50%
1.8 (1.8.7.6)33.75%
1.8 (1.8.8.9)22.50%
1.8 (1.8.2.1)22.50%
1.8 (1.8.9.2)22.50%
1.8 (1.8.8.7)22.50%
1.8 (1.8.7.3)22.50%
1.8 (1.8.8.8)22.50%
1.8 (1.8.5.5)11.25%
1.8 (1.8.5.8)11.25%
1.8 (1.8.6.1)11.25%
1.8 (1.8.8.4)11.25%
1.8 (1.8.6.0)11.25%
1.8 (1.8.9.4)11.25%
1.8 (1.8.3.5)11.25%
1.8 (1.8.1.1)11.25%
1.8 (1.8.5.9)11.25%
1.8 (1.8.2.5)11.25%
Other00.00%

GroupWise (60 servers)

Version Number of Servers Percent
18.1.1915.00%
14.2.2813.33%
18.2.1711.67%
18.2.0610.00%
14.2.158.33%
18.0.246.67%
14.2.346.67%
14.2.046.67%
18.1.035.00%
14.0.023.33%
14.0.111.67%
6.5.011.67%
6.5.511.67%
7.0.111.67%
6.0.511.67%
6.5.211.67%
18.0.011.67%
6.0.211.67%
Other00.00%

Gordano Messaging Suite (GMS) (30 servers)

Version Number of Servers Percent
Other30100.00%

Trend Micro (28 servers)

Version Number of Servers Percent
5.7932.14%
5.18932.14%
5.5310.71%
7.527.14%
7.027.14%
7.5ready13.57%
813.57%
7.113.57%
Other00.00%

OpenVMS (8 servers)

Version Number of Servers Percent
8.4450.00%
7.3337.50%
8.3112.50%
Other00.00%

InterScan VirusWall (7 servers)

Version Number of Servers Percent
Other7100.00%

VisNetic (7 servers)

Version Number of Servers Percent
9.3.2.0571.43%
8.0.3114.29%
6.2.2.0114.29%
Other00.00%

Interscan (4 servers)

Version Number of Servers Percent
3.81-Build_1022250.00%
3.8-Build_3013125.00%
3.8-Build_1080125.00%
Other00.00%

WebSTAR V (3 servers)

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

Mercury (3 servers)

Version Number of Servers Percent
4.x133.33%
4133.33%
1.48133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%




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