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Mail (MX) Server Survey
March 1st, 2024

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 Queried741,799   100.0%
Number of Servers that didn't respond122,01416.45%
    Server didn't open socket120,51016.25%
    Server didn't provide banner1,5040.20%
Server provided banner619,78583.55%
Server banner identifies software in use401,30854.10%

As indicated by the above table, of the 741,799 servers queried, only 401,308 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
Exim227,17256.61%
Postfix147,73536.81%
Sendmail14,4563.60%
MailEnable7,3181.82%
MDaemon1,6160.40%
Microsoft7810.19%
CommuniGate Pro4960.12%
OpenSMTPD3510.09%
XMail2780.07%
IMail2420.06%
SurgeSMTP2250.06%
Qmail Toaster1240.03%
WinWebMail1100.03%
MagicMail1030.03%
Lotus Domino830.02%
Merak500.01%
Post.Office500.01%
Kerio420.01%
ArGoSoft290.01%
GroupWise170.00%
Gordano Messaging Suite (GMS)70.00%
OpenVMS50.00%
Trend Micro50.00%
ModusMail40.00%
InterScan VirusWall30.00%
VisNetic20.00%
Mercury10.00%
MessageWall10.00%
Neon Mail Server10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (227,172 servers)

Version Number of Servers Percent
4.96.2164,97172.62%
4.9612,7765.62%
4.958,1983.61%
4.97.16,7072.95%
4.936,5092.87%
4.96.16,0822.68%
4.94.25,1862.28%
4.922,8471.25%
Other13,8966.12%

Postfix (147,735 servers)

Version Number of Servers Percent
Other147,735100.00%

Sendmail (14,456 servers)

Version Number of Servers Percent
8.16.14,94034.17%
8.15.24,24729.38%
8.14.71,2968.97%
8.14.41,2278.49%
8.13.85954.12%
8.14.55073.51%
8.17.13272.26%
8.14.92371.64%
8.17.22071.43%
8.13.11641.13%
Other7094.90%

MailEnable (7,318 servers)

Version Number of Servers Percent
10.46--3,01441.19%
10.34--3504.78%
10.43--3014.11%
10.47--2593.54%
10.27--2192.99%
10.47--10.472052.80%
10.25--1782.43%
10.47-10.47-1612.20%
10.43-10.43-1472.01%
10.42--1231.68%
9.00--841.15%
9.00--9.00821.12%
Other2,19529.99%

MDaemon (1,616 servers)

Version Number of Servers Percent
23.5.118911.70%
23.5.2875.38%
19.5.4794.89%
23.0.2764.70%
13.5.1724.46%
13.0.5603.71%
23.5.0603.71%
11.0.0553.40%
11.0.3513.16%
13.0.4503.09%
23.0.1452.78%
21.5.4402.48%
14.5.2372.29%
16.5.2372.29%
21.5.2311.92%
12.5.6271.67%
22.0.3241.49%
19.5.5201.24%
Other57635.64%

Microsoft (781 servers)

Version Number of Servers Percent
6.0.3790.467519524.97%
10.0.17763.169712816.39%
8.5.9600.1638410112.93%
10.0.14393.41699512.16%
7.5.7601.17514577.30%
6.0.3790.3959384.87%
5.0.2195.5329384.87%
8.0.9200.16384212.69%
5.0.2195.6713131.66%
10.0.20348.1111.41%
5.0.2195.7381101.28%
Other749.48%

CommuniGate Pro (496 servers)

Version Number of Servers Percent
6.2.155210.48%
6.2.14479.48%
6.4.1214.23%
6.4.0214.23%
6.3.17204.03%
6.3.18183.63%
6.1.20173.43%
6.3.20142.82%
5.4.11102.02%
6.3.19102.02%
6.1.1691.81%
5.1.1691.81%
6.3.1481.61%
7.1.681.61%
6.0.1181.61%
6.2.1271.41%
5.2.2071.41%
6.1.1871.41%
6.0.961.21%
6.3.661.21%
6.3.1551.01%
5.2.351.01%
5.1.751.01%
6.3.1351.01%
Other17134.48%

OpenSMTPD (351 servers)

Version Number of Servers Percent
Other351100.00%

XMail (278 servers)

Version Number of Servers Percent
1.2718466.19%
1.226724.10%
1.2582.88%
1.2672.52%
1.1541.44%
1.2431.08%
Other51.80%

IMail (242 servers)

Version Number of Servers Percent
12.6.1.43313.64%
12.5.8.41197.85%
12.5.6.101177.02%
9.23166.61%
12.5.8.59166.61%
12.5.6.105156.20%
12.5.7.59114.55%
12.5.3.93114.55%
8.22104.13%
12.5.8.58104.13%
8.0583.31%
12.4.1.1562.48%
12.3.0.10062.48%
12.6.0.1762.48%
12.5.4.14652.07%
7.0752.07%
12.5.5.11552.07%
8.1552.07%
12.5.8.5441.65%
10.0241.65%
11.541.65%
12.6.0.2031.24%
8.0031.24%
Other208.26%

SurgeSMTP (225 servers)

Version Number of Servers Percent
7.7c-13013.33%
7.7i-13013.33%
7.3e2-2156.67%
7.6j-1156.67%
7.3o4-4135.78%
7.5c-194.00%
7.5a-173.11%
7.1e-173.11%
7.4o-173.11%
6.9c-173.11%
7.6u-162.67%
7.6h-252.22%
7.7h-352.22%
7.7g-152.22%
7.4e-152.22%
7.7m-141.78%
7.2i-141.78%
7.6s-141.78%
6.5a2-241.78%
6.7c-141.78%
7.6d-141.78%
6.5a-131.33%
7.8a-131.33%
7.7j-131.33%
Other2611.56%

Qmail Toaster (124 servers)

Version Number of Servers Percent
1.037056.45%
1.35141.13%
1.03.521.61%
Other10.81%

WinWebMail (110 servers)

Version Number of Servers Percent
4.4.0.11816.36%
4.2.0.11412.73%
3.9.0.71311.82%
4.5.0.11210.91%
3.8.1.3109.09%
3.8.0.165.45%
4.3.0.143.64%
3.7.7.332.73%
3.9.2.132.73%
3.7.3.132.73%
4.1.0.132.73%
3.7.6.121.82%
3.8.1.521.82%
3.8.6.121.82%
3.8.5.121.82%
4.0.0.121.82%
3.9.0.321.82%
Other98.18%

MagicMail (103 servers)

Version Number of Servers Percent
Other103100.00%

Lotus Domino (83 servers)

Version Number of Servers Percent
8.5.31518.07%
8.5.3FP61012.05%
7.067.23%
7.0.356.02%
8.0.144.82%
7.0.244.82%
6.533.61%
6.5.333.61%
8.5.133.61%
8.5.2FP122.41%
8.5.3FP122.41%
8.022.41%
6.5.122.41%
8.5.2FP222.41%
8.5.222.41%
8.5.1FP522.41%
8.5.3FP211.20%
8.511.20%
8.5.3FP6HF121511.20%
6.0.111.20%
5.0.13a11.20%
8.5.2FP411.20%
5.0.811.20%
8.5.3FP511.20%
7.0.4FP111.20%
7.0.4FP211.20%
8.5.1FP311.20%
6.6.611.20%
6.5.211.20%
8.5.1FP211.20%
6.5.1IF111.20%
8.5.3FP311.20%
Other00.00%

Merak (50 servers)

Version Number of Servers Percent
8.9.11224.00%
8.0.31224.00%
7.6.1714.00%
8.3.8510.00%
7.4.524.00%
8.0.112.00%
8.9.212.00%
8.3.612.00%
6.1.012.00%
9.0.312.00%
7.5.212.00%
4.2.112.00%
7.6.012.00%
7.4.412.00%
6.0.812.00%
7.0.112.00%
5.8.212.00%
Other00.00%

Post.Office (50 servers)

Version Number of Servers Percent
4.42754.00%
4.2.2714.00%
3.5.3510.00%
4.348.00%
3.9.224.00%
4.1.2.424.00%
4.0.112.00%
3.1.212.00%
4.2.1.112.00%
Other00.00%

Kerio (42 servers)

Version Number of Servers Percent
6.7.3921.43%
6.7.1511.90%
6.6.1511.90%
6.7.0511.90%
6.6.249.52%
6.5.237.14%
5.7.924.76%
6.7.224.76%
6.4.112.38%
5.7.612.38%
6.0.812.38%
6.5.012.38%
6.5.112.38%
6.6.012.38%
6.3.012.38%
Other00.00%

ArGoSoft (29 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1034.48%
1.8 (1.8.9.3)517.24%
1.8 (1.8.9.5)413.79%
1.8 (1.8.6.1)13.45%
1.8 (1.8.7.3)13.45%
1.8 (1.8.8.4)13.45%
1.8 (1.8.8.8)13.45%
1.8 (1.8.1.7)13.45%
1.8 (1.8.6.0)13.45%
1.8 (1.8.8.7)13.45%
1.8 (1.8.9.1)13.45%
1.8 (1.8.9.4)13.45%
1.8 (1.8.9.2)13.45%
Other00.00%

GroupWise (17 servers)

Version Number of Servers Percent
18.5.0317.65%
18.1.1211.76%
18.2.1211.76%
18.3.1211.76%
14.2.115.88%
14.2.315.88%
18.0.015.88%
18.4.115.88%
23.4.015.88%
18.4.215.88%
14.2.215.88%
18.0.215.88%
Other00.00%

Gordano Messaging Suite (GMS) (7 servers)

Version Number of Servers Percent
Other7100.00%

OpenVMS (5 servers)

Version Number of Servers Percent
8.4360.00%
7.3120.00%
8.2120.00%
Other00.00%

Trend Micro (5 servers)

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

ModusMail (4 servers)

Version Number of Servers Percent
4.1.361.214100.00%
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%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
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%

Mirapoint (1 servers)

Version Number of Servers Percent
4.4.5-GA1100.00%
Other00.00%




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