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Mail (MX) Server Survey
December 1st, 2023

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 Queried1,201,857   100.0%
Number of Servers that didn't respond232,02719.31%
    Server didn't open socket229,11019.06%
    Server didn't provide banner2,9170.24%
Server provided banner969,83080.69%
Server banner identifies software in use609,37850.70%

As indicated by the above table, of the 1,201,857 servers queried, only 609,378 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
Exim339,57955.73%
Postfix229,70737.70%
Sendmail21,0013.45%
MailEnable11,1061.82%
MDaemon2,8100.46%
Microsoft1,4500.24%
CommuniGate Pro8140.13%
OpenSMTPD5790.10%
IMail4870.08%
XMail4580.08%
SurgeSMTP3350.05%
Qmail Toaster2020.03%
WinWebMail1940.03%
Lotus Domino1570.03%
MagicMail1500.02%
Post.Office750.01%
Kerio720.01%
Merak660.01%
ArGoSoft420.01%
GroupWise410.01%
Gordano Messaging Suite (GMS)180.00%
OpenVMS100.00%
InterScan VirusWall80.00%
Trend Micro50.00%
VisNetic40.00%
ModusMail20.00%
Mercury20.00%
MessageWall20.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (339,579 servers)

Version Number of Servers Percent
4.96.2230,51667.88%
4.9527,5788.12%
4.9623,0466.79%
4.96.112,5893.71%
4.9311,4973.39%
4.94.29,0562.67%
4.924,6871.38%
Other20,6106.07%

Postfix (229,707 servers)

Version Number of Servers Percent
Other229,707100.00%

Sendmail (21,001 servers)

Version Number of Servers Percent
8.16.16,60031.43%
8.15.25,86627.93%
8.14.72,30510.98%
8.14.42,0289.66%
8.13.89594.57%
8.14.59524.53%
8.17.14722.25%
8.13.13051.45%
8.14.92871.37%
8.17.22271.08%
Other1,0004.76%

MailEnable (11,106 servers)

Version Number of Servers Percent
10.46--4,37739.41%
10.34--5635.07%
10.43--5024.52%
10.27--3633.27%
10.25--3333.00%
10.47--2982.68%
10.47--10.472542.29%
10.42--2151.94%
10.43-10.43-2071.86%
10.47-10.47-1931.74%
9.00--1651.49%
10.45--1391.25%
Other3,49731.49%

MDaemon (2,810 servers)

Version Number of Servers Percent
23.5.039414.02%
23.0.22318.22%
13.5.11445.12%
19.5.41164.13%
13.0.5973.45%
11.0.3943.35%
11.0.0943.35%
23.0.1943.35%
13.0.4913.24%
21.5.4722.56%
16.5.2632.24%
14.5.2582.06%
22.0.3551.96%
21.5.2531.89%
12.5.6501.78%
19.5.5361.28%
12.5.4331.17%
10.0.0301.07%
Other1,00535.77%

Microsoft (1,450 servers)

Version Number of Servers Percent
6.0.3790.467538326.41%
10.0.17763.169725117.31%
8.5.9600.1638419213.24%
10.0.14393.416915610.76%
7.5.7601.175141047.17%
6.0.3790.3959815.59%
5.0.2195.5329594.07%
8.0.9200.16384332.28%
5.0.2195.6713221.52%
10.0.20348.1201.38%
5.0.2195.7381161.10%
6.0.3790.1830161.10%
10.0.17763.1151.03%
7.0.6002.18264151.03%
Other876.00%

CommuniGate Pro (814 servers)

Version Number of Servers Percent
6.2.15809.83%
6.2.14607.37%
6.3.17394.79%
6.4.0354.30%
6.1.20323.93%
6.3.20273.32%
6.3.18242.95%
6.4.1232.83%
5.4.11161.97%
6.3.19161.97%
6.0.9151.84%
6.0.11151.84%
6.1.16131.60%
6.1.18121.47%
5.2.20111.35%
6.3.14101.23%
6.3.15101.23%
6.2.12101.23%
6.3.6101.23%
5.1.1691.11%
Other34742.63%

OpenSMTPD (579 servers)

Version Number of Servers Percent
Other579100.00%

IMail (487 servers)

Version Number of Servers Percent
12.5.8.41479.65%
12.5.6.101438.83%
9.23346.98%
12.6.0.17326.57%
12.5.8.54295.95%
12.5.7.59275.54%
12.5.6.105255.13%
12.5.8.58244.93%
12.4.1.15244.93%
8.22234.72%
12.5.8.59204.11%
12.5.3.93193.90%
8.05173.49%
12.6.0.20142.87%
12.5.5.115132.67%
12.5.4.146122.46%
12.6.0.1981.64%
11.571.44%
12.3.0.10061.23%
8.0051.03%
10.0251.03%
8.1551.03%
12.5.5.11751.03%
Other438.83%

XMail (458 servers)

Version Number of Servers Percent
1.2728061.14%
1.2211424.89%
1.26183.93%
1.25163.49%
1.24132.84%
1.1551.09%
Other122.62%

SurgeSMTP (335 servers)

Version Number of Servers Percent
7.7c-16017.91%
7.3o4-4257.46%
7.6j-1247.16%
7.5c-1195.67%
7.6u-1175.07%
7.3e2-2154.48%
7.7i-1133.88%
7.1e-1102.99%
7.5a-1102.99%
6.5a2-292.69%
6.9c-192.69%
7.4o-182.39%
7.6s-182.39%
7.6h-282.39%
7.4e-182.39%
7.7j-161.79%
7.7g-161.79%
7.3i2-251.49%
6.7c-151.49%
7.7h-351.49%
7.2i-151.49%
7.6d-151.49%
6.5a-141.19%
Other5115.22%

Qmail Toaster (202 servers)

Version Number of Servers Percent
1.0311054.46%
1.38441.58%
1.03.541.98%
1.03.631.49%
Other10.50%

WinWebMail (194 servers)

Version Number of Servers Percent
4.4.0.13518.04%
4.2.0.12713.92%
3.8.1.32110.82%
3.9.0.7168.25%
4.5.0.1147.22%
3.9.0.173.61%
4.1.0.173.61%
4.3.0.173.61%
3.8.0.173.61%
3.7.3.173.61%
3.8.6.163.09%
3.7.7.352.58%
4.0.0.152.58%
3.9.2.142.06%
3.9.3.131.55%
3.8.1.531.55%
3.7.1.131.55%
3.8.5.131.55%
3.8.3.121.03%
3.7.6.121.03%
3.9.0.321.03%
3.9.5.321.03%
Other63.09%

Lotus Domino (157 servers)

Version Number of Servers Percent
8.5.3FP63019.11%
8.5.32415.29%
7.074.46%
8.574.46%
8.5.274.46%
8.5.174.46%
6.563.82%
7.0.263.82%
6.5.342.55%
8.042.55%
7.0.342.55%
8.0.142.55%
8.5.2FP131.91%
8.5.1FP531.91%
6.5.131.91%
8.5.3FP331.91%
8.5.3FP521.27%
8.5.3FP121.27%
8.5.3FP421.27%
6.5.421.27%
8.5.2FP221.27%
8.5.2FP421.27%
Other2314.65%

MagicMail (150 servers)

Version Number of Servers Percent
Other150100.00%

Post.Office (75 servers)

Version Number of Servers Percent
4.43648.00%
4.31013.33%
4.2.21013.33%
3.5.356.67%
4.1.2.456.67%
3.9.222.67%
4.2.1.322.67%
4.211.33%
4.0.111.33%
3.5.111.33%
3.1.211.33%
4.2.1.111.33%
Other00.00%

Kerio (72 servers)

Version Number of Servers Percent
6.7.31520.83%
6.7.01115.28%
6.6.2912.50%
6.6.1912.50%
6.7.168.33%
6.7.245.56%
6.5.245.56%
6.4.122.78%
6.6.022.78%
6.5.022.78%
5.7.911.39%
6.0.1011.39%
6.0.311.39%
6.0.511.39%
6.0.811.39%
5.7.611.39%
6.5.111.39%
6.4.011.39%
Other00.00%

Merak (66 servers)

Version Number of Servers Percent
8.0.31928.79%
8.9.11725.76%
7.6.1710.61%
8.3.857.58%
7.4.534.55%
6.0.823.03%
8.0.111.52%
8.9.211.52%
8.3.611.52%
6.1.011.52%
7.6.411.52%
9.0.311.52%
8.5.011.52%
7.5.211.52%
4.2.111.52%
7.6.011.52%
7.4.411.52%
7.0.111.52%
5.8.211.52%
Other00.00%

ArGoSoft (42 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1330.95%
1.8 (1.8.9.5)614.29%
1.8 (1.8.9.3)511.90%
1.8 (1.8.9.1)37.14%
1.8 (1.8.8.8)24.76%
1.8 (1.8.7.3)24.76%
1.8 (1.8.8.7)24.76%
1.8 (1.8.9.2)24.76%
1.8 (1.8.6.1)12.38%
1.8 (1.8.3.5)12.38%
1.8 (1.8.7.6)12.38%
1.8 (1.8.6.0)12.38%
1.8 (1.8.9.4)12.38%
1.8 (1.8.5.9)12.38%
1.8 (1.8.8.9)12.38%
Other00.00%

GroupWise (41 servers)

Version Number of Servers Percent
18.3.11126.83%
18.4.2614.63%
18.5.0512.20%
18.2.149.76%
18.2.037.32%
18.1.124.88%
6.5.712.44%
23.4.012.44%
14.2.312.44%
18.0.012.44%
6.5.012.44%
18.4.112.44%
18.1.012.44%
14.2.212.44%
14.0.012.44%
18.0.212.44%
Other00.00%

Gordano Messaging Suite (GMS) (18 servers)

Version Number of Servers Percent
Other18100.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4660.00%
7.3330.00%
8.2110.00%
Other00.00%

InterScan VirusWall (8 servers)

Version Number of Servers Percent
Other8100.00%

Trend Micro (5 servers)

Version Number of Servers Percent
5.18360.00%
5.7120.00%
5.5120.00%
Other00.00%

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0250.00%
8.0.3125.00%
6.2.2.0125.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Mercury (2 servers)

Version Number of Servers Percent
1.48150.00%
4.x150.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

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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