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Mail (MX) Server Survey
September 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 Queried1,162,055   100.0%
Number of Servers that didn't respond219,11718.86%
    Server didn't open socket216,30218.61%
    Server didn't provide banner2,8150.24%
Server provided banner942,93881.14%
Server banner identifies software in use602,04851.81%

As indicated by the above table, of the 1,162,055 servers queried, only 602,048 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
Exim342,33756.86%
Postfix220,81036.68%
Sendmail20,0673.33%
MailEnable11,1301.85%
MDaemon2,7500.46%
Microsoft1,4340.24%
CommuniGate Pro7710.13%
OpenSMTPD4860.08%
IMail4790.08%
XMail4380.07%
SurgeSMTP3190.05%
Qmail Toaster2170.04%
WinWebMail1620.03%
MagicMail1550.03%
Lotus Domino1550.03%
Kerio730.01%
Post.Office720.01%
Merak610.01%
GroupWise400.01%
ArGoSoft370.01%
Gordano Messaging Suite (GMS)250.00%
OpenVMS70.00%
Trend Micro60.00%
InterScan VirusWall60.00%
VisNetic30.00%
Mercury20.00%
ModusMail20.00%
MessageWall20.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (342,337 servers)

Version Number of Servers Percent
4.96249,19772.79%
4.9539,02711.40%
4.94.214,2554.16%
4.9312,4813.65%
4.924,8941.43%
Other22,4836.57%

Postfix (220,810 servers)

Version Number of Servers Percent
Other220,810100.00%

Sendmail (20,067 servers)

Version Number of Servers Percent
8.16.16,33431.56%
8.15.25,63828.10%
8.14.72,28711.40%
8.14.41,9649.79%
8.13.89554.76%
8.14.57853.91%
8.17.14242.11%
8.13.12961.48%
8.14.92811.40%
Other1,1035.50%

MailEnable (11,130 servers)

Version Number of Servers Percent
10.46--2,41821.73%
10.43--2,31220.77%
10.34--6475.81%
10.27--4143.72%
10.25--3503.14%
10.42--2472.22%
10.45--2252.02%
10.43-10.43-2061.85%
9.00--1921.73%
10.47--10.471461.31%
Other3,97335.70%

MDaemon (2,750 servers)

Version Number of Servers Percent
23.0.245516.55%
23.0.11666.04%
13.5.11495.42%
19.5.41043.78%
13.0.51033.75%
13.0.4953.45%
11.0.0923.35%
11.0.3893.24%
16.5.2692.51%
14.5.2632.29%
22.0.3612.22%
21.5.2511.85%
12.5.6481.75%
21.5.4431.56%
19.5.5401.45%
23.0.0381.38%
10.0.0351.27%
12.5.4311.13%
21.5.3281.02%
Other99036.00%

Microsoft (1,434 servers)

Version Number of Servers Percent
6.0.3790.467539627.62%
10.0.17763.169722515.69%
8.5.9600.1638418412.83%
10.0.14393.416917011.85%
7.5.7601.175141037.18%
6.0.3790.3959866.00%
5.0.2195.5329604.18%
8.0.9200.16384332.30%
5.0.2195.6713251.74%
6.0.3790.1830161.12%
7.0.6002.18264151.05%
10.0.17763.1151.05%
Other1067.39%

CommuniGate Pro (771 servers)

Version Number of Servers Percent
6.2.15779.99%
6.2.14607.78%
6.3.17344.41%
6.1.20303.89%
6.4.0263.37%
6.3.18253.24%
6.3.19212.72%
6.3.20172.20%
5.4.11162.08%
6.0.11141.82%
6.1.18141.82%
5.2.20131.69%
6.3.16131.69%
6.0.9121.56%
6.1.16121.56%
6.2.12121.56%
5.1.16111.43%
7.1.4111.43%
6.3.14101.30%
6.3.6101.30%
6.4.1101.30%
7.1.191.17%
7.1.281.04%
Other30639.69%

OpenSMTPD (486 servers)

Version Number of Servers Percent
Other486100.00%

IMail (479 servers)

Version Number of Servers Percent
12.5.6.101418.56%
12.5.8.41418.56%
12.6.0.17336.89%
12.5.7.59306.26%
9.23296.05%
12.4.1.15296.05%
12.5.8.54234.80%
12.5.8.58224.59%
8.05214.38%
12.5.8.59204.18%
12.5.5.115204.18%
12.5.6.105204.18%
12.5.3.93193.97%
8.22183.76%
12.3.0.100132.71%
12.5.4.146112.30%
12.6.0.1981.67%
12.6.0.2071.46%
8.1571.46%
11.571.46%
8.0051.04%
10.0251.04%
Other5010.44%

XMail (438 servers)

Version Number of Servers Percent
1.2725357.76%
1.2212127.63%
1.26173.88%
1.25173.88%
1.24132.97%
1.1561.37%
Other112.51%

SurgeSMTP (319 servers)

Version Number of Servers Percent
7.7c-16219.44%
7.6j-1288.78%
7.3o4-4237.21%
7.6u-1226.90%
7.5c-1154.70%
7.3e2-2144.39%
7.4o-1113.45%
7.1e-1103.13%
7.5a-1103.13%
7.6s-1103.13%
7.6d-1103.13%
7.6h-292.82%
7.7g-192.82%
7.4e-182.51%
6.5a2-272.19%
6.9c-172.19%
6.7c-151.57%
7.2i-151.57%
7.3i2-241.25%
Other5015.67%

Qmail Toaster (217 servers)

Version Number of Servers Percent
1.0311753.92%
1.39342.86%
1.03.541.84%
Other31.38%

WinWebMail (162 servers)

Version Number of Servers Percent
4.4.0.12917.90%
3.9.0.72012.35%
3.8.1.31911.73%
4.2.0.11710.49%
4.3.0.1106.17%
4.1.0.174.32%
3.8.0.174.32%
3.9.0.163.70%
4.5.0.163.70%
4.0.0.163.70%
3.8.6.163.70%
3.7.3.153.09%
3.9.3.131.85%
3.7.1.131.85%
3.8.1.131.85%
3.7.7.321.23%
3.8.5.121.23%
3.8.1.521.23%
Other95.56%

MagicMail (155 servers)

Version Number of Servers Percent
Other155100.00%

Lotus Domino (155 servers)

Version Number of Servers Percent
8.5.3FP62717.42%
8.5.32415.48%
8.5.1106.45%
7.074.52%
8.5.274.52%
7.0.263.87%
7.0.353.23%
8.553.23%
8.5.2FP142.58%
6.542.58%
8.042.58%
6.5.142.58%
8.5.3FP342.58%
8.5.1FP531.94%
8.5.2FP231.94%
8.0.131.94%
7.0.3FP131.94%
8.5.3FP121.29%
6.5.221.29%
5.0.13a21.29%
6.5.421.29%
8.5.2FP321.29%
6.5.321.29%
8.5.3FP521.29%
Other1811.61%

Kerio (73 servers)

Version Number of Servers Percent
6.7.31520.55%
6.7.01317.81%
6.6.1810.96%
6.6.268.22%
6.7.156.85%
6.5.256.85%
6.7.245.48%
6.5.034.11%
5.7.922.74%
6.4.122.74%
6.3.122.74%
6.5.122.74%
6.0.311.37%
6.0.811.37%
5.7.611.37%
6.6.011.37%
6.4.011.37%
6.3.011.37%
Other00.00%

Post.Office (72 servers)

Version Number of Servers Percent
4.42838.89%
4.2.21216.67%
4.31013.89%
3.5.356.94%
4.1.2.445.56%
3.5.134.17%
3.9.222.78%
4.222.78%
4.2.1.322.78%
4.0.111.39%
4.111.39%
3.1.211.39%
4.2.1.111.39%
Other00.00%

Merak (61 servers)

Version Number of Servers Percent
8.9.11626.23%
8.0.31626.23%
7.6.1813.11%
8.3.858.20%
7.4.534.92%
8.0.111.64%
8.9.211.64%
8.3.611.64%
6.1.011.64%
7.6.411.64%
8.5.011.64%
7.5.211.64%
4.2.111.64%
7.6.011.64%
7.4.411.64%
6.0.811.64%
7.0.111.64%
5.8.211.64%
Other00.00%

GroupWise (40 servers)

Version Number of Servers Percent
18.3.1922.50%
18.2.1615.00%
18.5.0512.50%
18.4.237.50%
18.1.125.00%
18.2.025.00%
14.2.225.00%
6.5.712.50%
14.2.112.50%
14.2.312.50%
18.0.012.50%
6.5.012.50%
18.4.112.50%
18.3.012.50%
18.1.012.50%
7.0.412.50%
14.0.012.50%
18.0.212.50%
Other00.00%

ArGoSoft (37 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1437.84%
1.8 (1.8.9.3)38.11%
1.8 (1.8.9.1)38.11%
1.8 (1.8.8.8)25.41%
1.8 (1.8.9.2)25.41%
1.8 (1.8.9.5)25.41%
1.8 (1.8.6.1)12.70%
1.8 (1.8.7.3)12.70%
1.8 (1.8.1.7)12.70%
1.8 (1.8.7.6)12.70%
1.8 (1.8.8.4)12.70%
1.8 (1.8.6.0)12.70%
1.8 (1.8.8.7)12.70%
1.8 (1.8.5.9)12.70%
1.8 (1.8.9.4)12.70%
1.8 (1.8.3.5)12.70%
1.8 (1.8.8.9)12.70%
Other00.00%

Gordano Messaging Suite (GMS) (25 servers)

Version Number of Servers Percent
Other25100.00%

OpenVMS (7 servers)

Version Number of Servers Percent
8.4457.14%
7.3228.57%
8.2114.29%
Other00.00%

Trend Micro (6 servers)

Version Number of Servers Percent
5.18350.00%
5.5233.33%
5.7116.67%
Other00.00%

InterScan VirusWall (6 servers)

Version Number of Servers Percent
Other6100.00%

VisNetic (3 servers)

Version Number of Servers Percent
9.3.2.0266.67%
8.0.3133.33%
Other00.00%

Mercury (2 servers)

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

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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