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Mail (MX) Server Survey
April 1st, 2022

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 Queried852,563   100.0%
Number of Servers that didn't respond136,43516.00%
    Server didn't open socket134,24715.75%
    Server didn't provide banner2,1880.26%
Server provided banner716,12884.00%
Server banner identifies software in use475,84655.81%

As indicated by the above table, of the 852,563 servers queried, only 475,846 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
Exim288,27960.58%
Postfix155,23832.62%
Sendmail16,8943.55%
MailEnable9,3681.97%
MDaemon2,2140.47%
Microsoft1,0890.23%
CommuniGate Pro5650.12%
IMail4050.09%
Qmail Toaster3950.08%
XMail3340.07%
OpenSMTPD2620.06%
SurgeSMTP2440.05%
Lotus Domino1080.02%
MagicMail1040.02%
WinWebMail780.02%
Merak580.01%
Post.Office560.01%
Kerio550.01%
ArGoSoft330.01%
GroupWise270.01%
Gordano Messaging Suite (GMS)130.00%
Trend Micro80.00%
OpenVMS50.00%
VisNetic50.00%
ModusMail20.00%
Neon Mail Server10.00%
Interscan10.00%
Mercury10.00%
WebSTAR V10.00%
WebSTAR10.00%
Mirapoint10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (288,279 servers)

Version Number of Servers Percent
4.94.2174,90860.67%
4.9561,19921.23%
4.9319,3796.72%
4.924,8761.69%
4.944,7181.64%
4.913,4731.20%
Other19,7266.84%

Postfix (155,238 servers)

Version Number of Servers Percent
Other155,238100.00%

Sendmail (16,894 servers)

Version Number of Servers Percent
8.15.29,43755.86%
8.14.41,91511.34%
8.14.71,87611.10%
8.13.89035.35%
8.14.58635.11%
8.16.14232.50%
8.14.92781.65%
8.13.12681.59%
8.17.11701.01%
Other7614.50%

MailEnable (9,368 servers)

Version Number of Servers Percent
10.34--3,83040.88%
10.27--5966.36%
10.25--4654.96%
10.37--2602.78%
9.00--2502.67%
10.31--1441.54%
10.37--10.371321.41%
10.31-10.31-1311.40%
10.37-10.37-1211.29%
9.00--9.001091.16%
10.38--1011.08%
9.16--981.05%
Other3,13133.42%

MDaemon (2,214 servers)

Version Number of Servers Percent
21.5.229813.46%
13.5.11486.68%
21.5.11004.52%
13.0.5883.97%
11.0.0843.79%
13.0.4813.66%
11.0.3803.61%
21.0.3622.80%
16.5.2592.66%
19.5.5572.57%
14.5.2482.17%
19.5.4482.17%
21.0.2452.03%
12.5.6421.90%
21.0.1411.85%
21.5.0401.81%
10.1.2271.22%
10.0.0261.17%
12.5.4251.13%
20.0.4231.04%
Other79235.77%

Microsoft (1,089 servers)

Version Number of Servers Percent
6.0.3790.467535432.51%
8.5.9600.1638417215.79%
10.0.14393.416911410.47%
7.5.7601.17514888.08%
10.0.17763.1697857.81%
5.0.2195.5329555.05%
6.0.3790.3959555.05%
8.0.9200.16384272.48%
5.0.2195.6713201.84%
6.0.3790.1830141.29%
10.0.14393.2608131.19%
10.0.17763.1121.10%
Other807.35%

CommuniGate Pro (565 servers)

Version Number of Servers Percent
6.2.157312.92%
6.2.14549.56%
6.1.20244.25%
6.0.11173.01%
6.1.16162.83%
7.1.1162.83%
6.1.18152.65%
6.3.10152.65%
5.2.20142.48%
6.2.12142.48%
5.4.11132.30%
6.0.9122.12%
6.3.6101.77%
6.2.1691.59%
6.3.991.59%
6.3.571.24%
6.2.1071.24%
6.3.461.06%
6.0.761.06%
6.3.361.06%
6.2.761.06%
Other21638.23%

IMail (405 servers)

Version Number of Servers Percent
12.5.8.416215.31%
12.5.6.101399.63%
12.5.7.59327.90%
12.5.8.58286.91%
12.4.1.15266.42%
9.23256.17%
12.5.6.105194.69%
12.5.3.93174.20%
8.05174.20%
12.3.0.100163.95%
8.22153.70%
12.5.8.54143.46%
8.15133.21%
12.5.5.115133.21%
10.02122.96%
12.5.5.11781.98%
12.5.4.14661.48%
Other4310.62%

Qmail Toaster (395 servers)

Version Number of Servers Percent
1.329775.19%
1.038922.53%
1.03.561.52%
Other30.76%

XMail (334 servers)

Version Number of Servers Percent
1.2717953.59%
1.2210130.24%
1.26175.09%
1.25144.19%
1.2492.69%
1.1551.50%
Other92.69%

OpenSMTPD (262 servers)

Version Number of Servers Percent
Other262100.00%

SurgeSMTP (244 servers)

Version Number of Servers Percent
7.3o4-43112.70%
7.6j-12510.25%
7.5c-1218.61%
7.6h-2176.97%
7.5a-1166.56%
7.3e2-2166.56%
7.1e-1104.10%
7.4o-1104.10%
7.4e-183.28%
7.6d-183.28%
7.6m-172.87%
6.7c-172.87%
6.5a2-252.05%
7.3i2-241.64%
3.9e-141.64%
6.9c-131.23%
7.2a-131.23%
Other4920.08%

Lotus Domino (108 servers)

Version Number of Servers Percent
8.5.32119.44%
8.5.3FP62018.52%
7.076.48%
8.5.2FP265.56%
7.0.354.63%
7.0.243.70%
8.5.143.70%
8.5.232.78%
5.0.832.78%
6.521.85%
6.5.321.85%
8.0.121.85%
7.0.3FP121.85%
8.5.2FP321.85%
8.5.3FP421.85%
8.5.1FP521.85%
8.5.3FP121.85%
8.5.2FP121.85%
8.021.85%
8.5.3FP521.85%
Other1312.04%

MagicMail (104 servers)

Version Number of Servers Percent
Other104100.00%

WinWebMail (78 servers)

Version Number of Servers Percent
4.2.0.11823.08%
3.9.0.71316.67%
4.4.0.1810.26%
3.8.6.156.41%
4.3.0.156.41%
3.8.1.356.41%
4.1.0.133.85%
3.7.3.133.85%
3.7.6.133.85%
3.7.5.122.56%
3.8.1.522.56%
3.8.0.122.56%
4.0.0.122.56%
1.022.56%
3.9.0.111.28%
3.7.6.211.28%
3.8.5.111.28%
3.8.1.111.28%
3.9.2.211.28%
Other00.00%

Merak (58 servers)

Version Number of Servers Percent
8.0.31627.59%
8.9.11220.69%
7.6.1712.07%
8.3.846.90%
8.5.035.17%
7.4.535.17%
7.6.023.45%
9.0.323.45%
7.0.111.72%
6.0.811.72%
7.4.411.72%
4.4.211.72%
8.9.711.72%
6.1.011.72%
8.3.611.72%
8.9.211.72%
8.9.011.72%
Other00.00%

Post.Office (56 servers)

Version Number of Servers Percent
4.41730.36%
4.31119.64%
4.2.21119.64%
4.1.2.458.93%
3.5.335.36%
3.9.223.57%
4.211.79%
4.1.111.79%
3.5.3J11.79%
4.0.111.79%
4.1.0.311.79%
4.111.79%
3.1.211.79%
Other00.00%

Kerio (55 servers)

Version Number of Servers Percent
6.7.31425.45%
6.7.0814.55%
6.6.1610.91%
6.6.2610.91%
6.5.259.09%
6.7.147.27%
6.5.035.45%
6.7.223.64%
6.5.123.64%
6.0.1011.82%
5.7.911.82%
6.3.111.82%
6.0.811.82%
6.6.011.82%
Other00.00%

ArGoSoft (33 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)721.21%
1.8 (1.8.9.5)412.12%
1.8 (1.8.8.8)39.09%
1.8 (1.8.9.3)39.09%
1.8 (1.8.2.1)26.06%
1.8 (1.8.9.2)26.06%
1.8 (1.8.9.1)26.06%
1.8 (1.8.7.3)26.06%
1.8 (1.8.8.9)13.03%
1.8 (1.8.8.7)13.03%
1.8 (1.8.7.6)13.03%
1.8 (1.8.5.8)13.03%
1.8 (1.8.8.4)13.03%
1.8 (1.8.9.4)13.03%
1.8 (1.8.6.1)13.03%
1.8 (1.8.2.5)13.03%
Other00.00%

GroupWise (27 servers)

Version Number of Servers Percent
18.3.1725.93%
18.1.1311.11%
18.4.0311.11%
18.2.1311.11%
14.2.127.41%
18.0.013.70%
6.5.013.70%
8.0.313.70%
14.2.013.70%
14.2.213.70%
14.0.013.70%
18.2.013.70%
14.2.313.70%
18.0.213.70%
Other00.00%

Gordano Messaging Suite (GMS) (13 servers)

Version Number of Servers Percent
Other13100.00%

Trend Micro (8 servers)

Version Number of Servers Percent
5.18450.00%
5.7337.50%
7.5ready112.50%
Other00.00%

OpenVMS (5 servers)

Version Number of Servers Percent
8.4240.00%
7.3240.00%
8.2120.00%
Other00.00%

VisNetic (5 servers)

Version Number of Servers Percent
9.3.2.0360.00%
8.0.3120.00%
5.0.1120.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%

Interscan (1 servers)

Version Number of Servers Percent
3.8-Build_30131100.00%
Other00.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
Other00.00%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.4.11100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Mirapoint (1 servers)

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

InterScan VirusWall (1 servers)

Version Number of Servers Percent
Other1100.00%




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