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Mail (MX) Server Survey
October 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 Queried967,660   100.0%
Number of Servers that didn't respond173,20317.90%
    Server didn't open socket171,05717.68%
    Server didn't provide banner2,1460.22%
Server provided banner794,45782.10%
Server banner identifies software in use519,10353.65%

As indicated by the above table, of the 967,660 servers queried, only 519,103 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
Exim303,89258.54%
Postfix182,40235.14%
Sendmail17,1423.30%
MailEnable9,5671.84%
MDaemon2,1620.42%
Microsoft1,0960.21%
CommuniGate Pro6630.13%
IMail3830.07%
OpenSMTPD3780.07%
XMail3600.07%
SurgeSMTP2700.05%
Qmail Toaster1750.03%
MagicMail1340.03%
Lotus Domino1140.02%
WinWebMail970.02%
Kerio580.01%
Merak570.01%
Post.Office530.01%
ArGoSoft340.01%
GroupWise310.01%
Gordano Messaging Suite (GMS)120.00%
OpenVMS90.00%
Trend Micro50.00%
InterScan VirusWall30.00%
VisNetic20.00%
ModusMail10.00%
MessageWall10.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (303,892 servers)

Version Number of Servers Percent
4.96227,00174.70%
4.9531,11510.24%
4.94.212,1724.01%
4.9310,7183.53%
4.924,1131.35%
Other18,7736.18%

Postfix (182,402 servers)

Version Number of Servers Percent
Other182,402100.00%

Sendmail (17,142 servers)

Version Number of Servers Percent
8.16.15,63432.87%
8.15.24,99329.13%
8.14.71,81210.57%
8.14.41,6589.67%
8.13.87814.56%
8.14.54882.85%
8.17.13682.15%
8.13.12521.47%
8.14.92461.44%
Other9105.31%

MailEnable (9,567 servers)

Version Number of Servers Percent
10.46--3,65838.24%
10.43--5625.87%
10.34--5475.72%
10.27--3343.49%
10.25--2963.09%
10.42--1871.95%
10.47--10.471661.74%
9.00--1601.67%
10.43-10.43-1551.62%
10.47--1381.44%
10.45--1341.40%
10.47-10.47-1191.24%
9.00--9.001031.08%
Other3,00831.44%

MDaemon (2,162 servers)

Version Number of Servers Percent
23.0.242319.57%
13.5.11115.13%
23.0.11074.95%
19.5.4793.65%
13.0.5793.65%
13.0.4723.33%
11.0.3693.19%
11.0.0663.05%
16.5.2512.36%
14.5.2482.22%
21.5.4442.04%
22.0.3431.99%
12.5.6401.85%
21.5.2371.71%
19.5.5321.48%
12.5.4241.11%
21.5.3231.06%
23.0.0221.02%
Other79236.63%

Microsoft (1,096 servers)

Version Number of Servers Percent
6.0.3790.467528826.28%
10.0.17763.169716815.33%
8.5.9600.1638414513.23%
10.0.14393.416912811.68%
7.5.7601.17514756.84%
6.0.3790.3959625.66%
5.0.2195.5329504.56%
8.0.9200.16384272.46%
5.0.2195.6713191.73%
7.0.6002.18264131.19%
10.0.14393.0131.19%
6.0.3790.1830131.19%
10.0.20348.1111.00%
10.0.17763.1111.00%
Other736.66%

CommuniGate Pro (663 servers)

Version Number of Servers Percent
6.2.157010.56%
6.2.14527.84%
6.3.17365.43%
6.4.0243.62%
6.3.18223.32%
6.1.20203.02%
6.3.19172.56%
6.3.20172.56%
5.4.11121.81%
6.0.9121.81%
6.4.1121.81%
6.0.11111.66%
6.3.14101.51%
6.3.15101.51%
6.1.18101.51%
6.1.1691.36%
5.2.2091.36%
5.1.1691.36%
6.3.1691.36%
7.1.481.21%
6.2.1681.21%
7.1.171.06%
6.1.1971.06%
6.2.1271.06%
Other25538.46%

IMail (383 servers)

Version Number of Servers Percent
12.5.6.101318.09%
12.5.8.41318.09%
9.23287.31%
12.5.7.59236.01%
12.6.0.17215.48%
12.5.8.58215.48%
12.5.8.59215.48%
12.5.8.54205.22%
12.5.3.93174.44%
8.22164.18%
12.4.1.15164.18%
8.05153.92%
12.5.5.115153.92%
12.5.6.105123.13%
12.3.0.100102.61%
12.6.0.1992.35%
12.5.4.14682.09%
12.6.0.2061.57%
8.0051.31%
11.551.31%
10.0241.04%
7.0741.04%
8.1541.04%
Other4110.70%

OpenSMTPD (378 servers)

Version Number of Servers Percent
Other378100.00%

XMail (360 servers)

Version Number of Servers Percent
1.2722061.11%
1.229125.28%
1.25164.44%
1.26133.61%
1.2471.94%
1.1561.67%
Other71.94%

SurgeSMTP (270 servers)

Version Number of Servers Percent
7.7c-15520.37%
7.6j-1238.52%
7.3o4-4197.04%
7.6u-1186.67%
7.5c-1155.56%
7.3e2-2145.19%
7.7g-1124.44%
7.5a-182.96%
6.9c-182.96%
7.6h-282.96%
7.4e-182.96%
7.1e-172.59%
6.5a2-272.59%
7.6s-162.22%
7.4o-162.22%
7.6d-162.22%
7.3i2-241.48%
6.7c-141.48%
Other4215.56%

Qmail Toaster (175 servers)

Version Number of Servers Percent
1.039453.71%
1.37643.43%
1.03.531.71%
Other21.14%

MagicMail (134 servers)

Version Number of Servers Percent
Other134100.00%

Lotus Domino (114 servers)

Version Number of Servers Percent
8.5.31815.79%
8.5.3FP61311.40%
8.5.176.14%
7.065.26%
7.0.354.39%
7.0.254.39%
6.543.51%
8.5.2FP143.51%
8.543.51%
6.5.132.63%
8.5.2FP232.63%
8.5.3FP332.63%
8.0.132.63%
8.5.3FP121.75%
8.021.75%
6.5.421.75%
8.5.221.75%
8.5.1FP521.75%
8.5.3FP521.75%
6.5.321.75%
7.0.4FP221.75%
7.0.3FP121.75%
Other1815.79%

WinWebMail (97 servers)

Version Number of Servers Percent
4.4.0.12020.62%
4.2.0.11212.37%
3.9.0.71111.34%
3.8.1.377.22%
3.8.6.166.19%
4.5.0.155.15%
4.3.0.155.15%
3.7.3.144.12%
4.1.0.144.12%
3.8.0.133.09%
4.0.0.133.09%
3.8.1.122.06%
3.8.3.111.03%
1.011.03%
3.7.6.111.03%
3.8.5.111.03%
3.9.3.111.03%
3.8.2.111.03%
3.7.0.311.03%
3.9.5.311.03%
3.7.1.111.03%
3.9.2.111.03%
3.7.7.311.03%
3.9.0.111.03%
3.8.1.511.03%
3.8.1.611.03%
3.7.5.111.03%
Other00.00%

Kerio (58 servers)

Version Number of Servers Percent
6.7.31017.24%
6.6.1813.79%
6.6.2712.07%
6.7.0712.07%
6.7.158.62%
6.5.246.90%
6.5.035.17%
5.7.923.45%
6.4.123.45%
6.5.123.45%
6.0.1011.72%
6.0.311.72%
6.3.111.72%
6.0.811.72%
6.7.211.72%
5.7.611.72%
6.6.011.72%
6.3.011.72%
Other00.00%

Merak (57 servers)

Version Number of Servers Percent
8.0.31729.82%
8.9.11526.32%
7.6.1712.28%
7.4.535.26%
8.3.835.26%
7.6.423.51%
8.0.111.75%
8.9.211.75%
6.1.011.75%
9.0.311.75%
8.5.011.75%
4.2.111.75%
7.4.411.75%
6.0.811.75%
7.0.111.75%
5.8.211.75%
Other00.00%

Post.Office (53 servers)

Version Number of Servers Percent
4.41935.85%
4.2.21018.87%
4.3815.09%
3.5.359.43%
4.1.2.435.66%
3.9.223.77%
4.211.89%
3.5.111.89%
4.2.1.311.89%
4.111.89%
3.1.211.89%
4.2.1.111.89%
Other00.00%

ArGoSoft (34 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1029.41%
1.8 (1.8.9.5)514.71%
1.8 (1.8.9.3)411.76%
1.8 (1.8.9.1)38.82%
1.8 (1.8.8.8)25.88%
1.8 (1.8.8.7)25.88%
1.8 (1.8.9.2)25.88%
1.8 (1.8.6.1)12.94%
1.8 (1.8.7.3)12.94%
1.8 (1.8.7.6)12.94%
1.8 (1.8.8.4)12.94%
1.8 (1.8.6.0)12.94%
1.8 (1.8.8.9)12.94%
Other00.00%

GroupWise (31 servers)

Version Number of Servers Percent
18.3.1722.58%
18.2.1516.13%
18.4.239.68%
18.5.039.68%
18.2.026.45%
14.2.226.45%
14.2.113.23%
18.1.113.23%
14.2.313.23%
18.0.013.23%
6.5.013.23%
18.4.113.23%
18.1.013.23%
14.0.013.23%
18.0.213.23%
Other00.00%

Gordano Messaging Suite (GMS) (12 servers)

Version Number of Servers Percent
Other12100.00%

OpenVMS (9 servers)

Version Number of Servers Percent
8.4555.56%
7.3333.33%
8.2111.11%
Other00.00%

Trend Micro (5 servers)

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

InterScan VirusWall (3 servers)

Version Number of Servers Percent
Other3100.00%

VisNetic (2 servers)

Version Number of Servers Percent
8.0.3150.00%
9.3.2.0150.00%
Other00.00%

ModusMail (1 servers)

Version Number of Servers Percent
4.1.361.211100.00%
Other00.00%

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
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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