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Mail (MX) Server Survey
March 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 Queried1,323,609   100.0%
Number of Servers that didn't respond278,39921.03%
    Server didn't open socket274,62920.75%
    Server didn't provide banner3,7700.28%
Server provided banner1,045,21078.97%
Server banner identifies software in use683,33751.63%

As indicated by the above table, of the 1,323,609 servers queried, only 683,337 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
Exim395,01057.81%
Postfix240,81035.24%
Sendmail23,8523.49%
MailEnable13,4611.97%
MDaemon3,7200.54%
Microsoft2,0560.30%
CommuniGate Pro8790.13%
IMail7230.11%
XMail5110.07%
Qmail Toaster4920.07%
OpenSMTPD4440.06%
SurgeSMTP3890.06%
Lotus Domino2010.03%
WinWebMail1730.03%
MagicMail1540.02%
Kerio1030.02%
Merak960.01%
Post.Office810.01%
ArGoSoft550.01%
GroupWise490.01%
Gordano Messaging Suite (GMS)310.00%
Trend Micro130.00%
OpenVMS120.00%
InterScan VirusWall50.00%
VisNetic50.00%
ModusMail20.00%
Interscan20.00%
Mercury20.00%
MessageWall20.00%
Mirapoint10.00%
Neon Mail Server10.00%
WebSTAR10.00%
WebSTAR V10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (395,010 servers)

Version Number of Servers Percent
4.94.2297,26975.26%
4.9328,2097.14%
4.9520,2545.13%
4.927,5531.91%
4.947,0571.79%
4.915,3871.36%
4.894,2441.07%
4.92.34,0091.01%
Other21,0285.32%

Postfix (240,810 servers)

Version Number of Servers Percent
Other240,810100.00%

Sendmail (23,852 servers)

Version Number of Servers Percent
8.15.211,94850.09%
8.14.43,11713.07%
8.14.73,06212.84%
8.13.81,4506.08%
8.14.51,3205.53%
8.16.16862.88%
8.13.13901.64%
8.14.93791.59%
8.14.32661.12%
8.17.12511.05%
Other9834.12%

MailEnable (13,461 servers)

Version Number of Servers Percent
10.34--5,24938.99%
10.27--8776.52%
10.25--7095.27%
10.37--4273.17%
9.00--3832.85%
10.37--10.372762.05%
10.31--2191.63%
10.37-10.37-2111.57%
10.31-10.31-1881.40%
10.29--1591.18%
9.16--1421.05%
Other4,62134.33%

MDaemon (3,720 servers)

Version Number of Servers Percent
21.5.12998.04%
21.5.22687.20%
13.5.12476.64%
13.0.41443.87%
21.0.31433.84%
13.0.51403.76%
11.0.01303.49%
11.0.31273.41%
19.5.41243.33%
19.5.51062.85%
16.5.2972.61%
21.5.0962.58%
21.0.2842.26%
12.5.6762.04%
14.5.2701.88%
21.0.1641.72%
12.5.4491.32%
20.0.4461.24%
10.1.2411.10%
15.0.3401.08%
10.0.0401.08%
Other1,28934.65%

Microsoft (2,056 servers)

Version Number of Servers Percent
6.0.3790.467565731.96%
8.5.9600.1638432715.90%
10.0.14393.41691989.63%
7.5.7601.175141818.80%
10.0.17763.16971587.68%
6.0.3790.39591296.27%
5.0.2195.5329793.84%
8.0.9200.16384582.82%
5.0.2195.6713361.75%
10.0.17763.1311.51%
7.0.6002.18264281.36%
6.0.3790.1830271.31%
10.0.14393.2608221.07%
Other1256.08%

CommuniGate Pro (879 servers)

Version Number of Servers Percent
6.2.159410.69%
6.2.14869.78%
6.1.20434.89%
6.0.11293.30%
6.2.12262.96%
5.2.20232.62%
6.3.9212.39%
6.1.16212.39%
6.3.6192.16%
5.4.11182.05%
6.3.5171.93%
6.0.9161.82%
6.1.18151.71%
5.1.16141.59%
6.3.3131.48%
6.3.7121.37%
7.1.1121.37%
6.2.7101.14%
5.2.3101.14%
6.2.1091.02%
6.1.1091.02%
6.2.1691.02%
6.3.491.02%
6.1.1191.02%
Other33538.11%

IMail (723 servers)

Version Number of Servers Percent
12.5.8.4112317.01%
12.5.7.597610.51%
12.5.6.1017610.51%
12.4.1.15567.75%
9.23446.09%
8.05304.15%
12.5.6.105304.15%
12.5.3.93294.01%
8.22283.87%
12.5.5.115273.73%
12.3.0.100233.18%
12.5.8.54223.04%
10.02192.63%
8.15182.49%
12.5.4.146162.21%
12.5.5.117131.80%
7.0781.11%
12.5.7.5881.11%
Other7710.65%

XMail (511 servers)

Version Number of Servers Percent
1.2727553.82%
1.2215931.12%
1.25234.50%
1.26203.91%
1.24152.94%
Other193.72%

Qmail Toaster (492 servers)

Version Number of Servers Percent
1.334469.92%
1.0313627.64%
1.03.571.42%
Other51.02%

OpenSMTPD (444 servers)

Version Number of Servers Percent
Other444100.00%

SurgeSMTP (389 servers)

Version Number of Servers Percent
7.3o4-45313.62%
7.6h-24411.31%
7.5c-1338.48%
7.5a-1246.17%
7.3e2-2225.66%
7.6d-1174.37%
7.1e-1164.11%
7.4o-1164.11%
7.6j-1153.86%
7.4e-1153.86%
6.7c-192.31%
7.3i2-282.06%
7.2i-171.80%
6.5a2-271.80%
7.6m-161.54%
7.5d-761.54%
6.5a-151.29%
7.4m-141.03%
6.9c-141.03%
7.2a-141.03%
3.9e-141.03%
Other7017.99%

Lotus Domino (201 servers)

Version Number of Servers Percent
8.5.3FP64120.40%
8.5.33416.92%
8.5.1104.98%
8.573.48%
8.5.273.48%
8.5.2FP273.48%
7.073.48%
7.0.362.99%
7.0.252.49%
8.5.3FP352.49%
8.041.99%
8.5.1FP541.99%
6.541.99%
8.5.2FP331.49%
5.0.831.49%
7.0.3FP131.49%
8.0.131.49%
8.5.3FP131.49%
6.5.131.49%
8.5.3FP431.49%
Other3919.40%

WinWebMail (173 servers)

Version Number of Servers Percent
4.2.0.13319.08%
3.9.0.72313.29%
4.4.0.12011.56%
3.8.1.3179.83%
4.3.0.1148.09%
3.7.3.163.47%
3.9.0.163.47%
4.0.0.152.89%
3.8.0.152.89%
3.8.1.152.89%
3.7.7.342.31%
3.8.6.142.31%
3.7.6.142.31%
1.031.73%
4.1.0.131.73%
3.8.1.531.73%
3.9.3.121.16%
3.8.3.121.16%
3.7.0.321.16%
3.8.2.121.16%
3.9.5.321.16%
3.7.1.121.16%
3.8.5.121.16%
3.7.5.121.16%
Other21.16%

MagicMail (154 servers)

Version Number of Servers Percent
Other154100.00%

Kerio (103 servers)

Version Number of Servers Percent
6.7.32524.27%
6.7.01514.56%
6.6.11110.68%
6.6.298.74%
6.7.276.80%
6.7.176.80%
6.5.265.83%
6.5.065.83%
5.7.921.94%
5.7.621.94%
6.0.521.94%
6.3.021.94%
6.4.121.94%
6.3.121.94%
6.5.121.94%
Other32.91%

Merak (96 servers)

Version Number of Servers Percent
8.9.12930.21%
8.0.31919.79%
7.6.177.29%
9.0.355.21%
8.3.855.21%
7.4.544.17%
8.5.033.12%
7.5.222.08%
6.0.822.08%
7.6.422.08%
7.4.222.08%
7.6.022.08%
6.0.711.04%
8.9.711.04%
7.0.111.04%
8.9.011.04%
7.4.411.04%
4.4.211.04%
5.8.211.04%
4.2.111.04%
8.3.011.04%
8.0.111.04%
6.1.011.04%
8.3.611.04%
8.9.211.04%
6.0.311.04%
Other00.00%

Post.Office (81 servers)

Version Number of Servers Percent
4.42530.86%
4.31619.75%
4.2.21214.81%
3.5.378.64%
4.1.2.467.41%
4.2.1.322.47%
3.9.222.47%
4.222.47%
4.2.1.122.47%
3.1.211.23%
4.111.23%
4.0.111.23%
3.5.111.23%
3.5.3J11.23%
4.1.111.23%
4.2.111.23%
Other00.00%

ArGoSoft (55 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1730.91%
1.8 (1.8.9.3)814.55%
1.8 (1.8.9.5)712.73%
1.8 (1.8.8.8)35.45%
1.8 (1.8.9.1)35.45%
1.8 (1.8.2.1)23.64%
1.8 (1.8.9.2)23.64%
1.8 (1.8.8.7)23.64%
1.8 (1.8.7.6)23.64%
1.8 (1.8.8.9)23.64%
1.8 (1.8.7.3)23.64%
1.8 (1.8.5.8)11.82%
1.8 (1.8.8.4)11.82%
1.8 (1.8.9.4)11.82%
1.8 (1.8.3.5)11.82%
1.8 (1.8.2.5)11.82%
Other00.00%

GroupWise (49 servers)

Version Number of Servers Percent
18.3.11122.45%
18.2.1918.37%
18.1.1510.20%
18.2.0510.20%
14.2.236.12%
18.1.024.08%
14.2.124.08%
14.0.024.08%
18.3.024.08%
14.2.312.04%
14.2.012.04%
6.5.012.04%
8.0.312.04%
18.0.012.04%
18.4.012.04%
6.5.712.04%
18.0.212.04%
Other00.00%

Gordano Messaging Suite (GMS) (31 servers)

Version Number of Servers Percent
Other31100.00%

Trend Micro (13 servers)

Version Number of Servers Percent
5.7430.77%
5.18430.77%
5.5215.38%
7.5ready17.69%
7.017.69%
7.117.69%
Other00.00%

OpenVMS (12 servers)

Version Number of Servers Percent
8.4650.00%
7.3433.33%
8.318.33%
8.218.33%
Other00.00%

InterScan VirusWall (5 servers)

Version Number of Servers Percent
Other5100.00%

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%

Interscan (2 servers)

Version Number of Servers Percent
3.8-Build_3013150.00%
3.81-Build_1022150.00%
Other00.00%

Mercury (2 servers)

Version Number of Servers Percent
1.48150.00%
4150.00%
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%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.4.11100.00%
Other00.00%




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