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Mail (MX) Server Survey
May 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 Queried1,077,377   100.0%
Number of Servers that didn't respond181,73916.87%
    Server didn't open socket179,00316.61%
    Server didn't provide banner2,7360.25%
Server provided banner895,63883.13%
Server banner identifies software in use580,30053.86%

As indicated by the above table, of the 1,077,377 servers queried, only 580,300 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
Exim340,66758.71%
Postfix200,45934.54%
Sendmail19,8863.43%
MailEnable11,2631.94%
MDaemon2,8840.50%
Microsoft1,5490.27%
CommuniGate Pro7060.12%
IMail5490.09%
Qmail Toaster4650.08%
XMail4000.07%
OpenSMTPD3730.06%
SurgeSMTP3170.05%
Lotus Domino1600.03%
WinWebMail1350.02%
MagicMail1300.02%
Merak770.01%
Kerio760.01%
Post.Office600.01%
ArGoSoft460.01%
GroupWise420.01%
Gordano Messaging Suite (GMS)190.00%
OpenVMS120.00%
Trend Micro80.00%
VisNetic40.00%
InterScan VirusWall40.00%
ModusMail20.00%
Mercury20.00%
Interscan10.00%
MessageWall10.00%
WebSTAR V10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (340,667 servers)

Version Number of Servers Percent
4.94.2142,91641.95%
4.95136,87240.18%
4.9323,0306.76%
4.925,8821.73%
4.945,1221.50%
4.914,1071.21%
Other22,7386.67%

Postfix (200,459 servers)

Version Number of Servers Percent
Other200,459100.00%

Sendmail (19,886 servers)

Version Number of Servers Percent
8.15.210,37652.18%
8.14.72,46112.38%
8.14.42,44812.31%
8.13.81,1035.55%
8.14.59824.94%
8.16.15983.01%
8.13.13471.74%
8.14.93171.59%
8.17.12671.34%
8.14.32141.08%
Other7733.89%

MailEnable (11,263 servers)

Version Number of Servers Percent
10.34--4,57840.65%
10.27--6796.03%
10.25--5424.81%
10.37--3052.71%
9.00--2952.62%
10.31-10.31-1721.53%
10.31--1611.43%
10.37--10.371571.39%
10.37-10.37-1251.11%
10.29--1211.07%
9.16--1161.03%
9.00--9.001141.01%
Other3,89834.61%

MDaemon (2,884 servers)

Version Number of Servers Percent
21.5.245615.81%
13.5.11866.45%
21.5.11234.26%
13.0.51184.09%
19.5.41013.50%
13.0.4943.26%
11.0.0893.09%
11.0.3883.05%
21.0.3812.81%
19.5.5762.64%
16.5.2752.60%
12.5.6612.12%
21.0.1551.91%
21.0.2521.80%
14.5.2501.73%
21.5.0481.66%
10.0.0381.32%
10.1.2351.21%
12.5.4341.18%
20.0.4331.14%
Other99134.36%

Microsoft (1,549 servers)

Version Number of Servers Percent
6.0.3790.467548531.31%
8.5.9600.1638424615.88%
10.0.14393.416915710.14%
7.5.7601.175141348.65%
10.0.17763.16971308.39%
6.0.3790.3959946.07%
5.0.2195.5329583.74%
8.0.9200.16384432.78%
5.0.2195.6713322.07%
10.0.17763.1231.48%
10.0.14393.2608171.10%
7.0.6002.18264171.10%
6.0.3790.1830171.10%
Other966.20%

CommuniGate Pro (706 servers)

Version Number of Servers Percent
6.2.158411.90%
6.2.14709.92%
6.1.20283.97%
6.3.10263.68%
6.0.11212.97%
6.2.12182.55%
5.2.20182.55%
6.3.9172.41%
5.4.11162.27%
7.1.1162.27%
6.1.16152.12%
5.1.16131.84%
6.1.18121.70%
6.3.6111.56%
6.0.9111.56%
6.3.5111.56%
6.2.1091.27%
6.2.781.13%
6.3.481.13%
Other29441.64%

IMail (549 servers)

Version Number of Servers Percent
12.5.8.417213.11%
12.5.6.101549.84%
12.5.7.59488.74%
12.5.8.58458.20%
9.23356.38%
12.5.5.115244.37%
12.5.8.54224.01%
12.5.3.93224.01%
8.22224.01%
8.05224.01%
12.4.1.15193.46%
12.3.0.100173.10%
12.5.6.105162.91%
8.15152.73%
12.5.4.146142.55%
10.02122.19%
12.5.5.11791.64%
12.5.8.5991.64%
7.0771.28%
Other6511.84%

Qmail Toaster (465 servers)

Version Number of Servers Percent
1.333672.26%
1.0311925.59%
1.03.561.29%
Other40.86%

XMail (400 servers)

Version Number of Servers Percent
1.2722857.00%
1.2211929.75%
1.26164.00%
1.25153.75%
1.2482.00%
1.1551.25%
Other92.25%

OpenSMTPD (373 servers)

Version Number of Servers Percent
Other373100.00%

SurgeSMTP (317 servers)

Version Number of Servers Percent
7.3o4-43711.67%
7.6j-13511.04%
7.5c-1309.46%
7.5a-1206.31%
7.3e2-2195.99%
7.6h-2175.36%
7.4o-1134.10%
7.1e-1123.79%
7.6d-1123.79%
7.4e-1103.15%
7.6m-182.52%
6.7c-182.52%
6.5a2-282.52%
7.3i2-272.21%
7.2i-151.58%
6.9c-141.26%
3.9e-141.26%
Other6821.45%

Lotus Domino (160 servers)

Version Number of Servers Percent
8.5.3FP63521.88%
8.5.32616.25%
8.5.274.38%
8.5.174.38%
7.063.75%
8.5.2FP263.75%
8.553.12%
8.5.1FP553.12%
7.0.353.12%
7.0.242.50%
8.5.2FP131.88%
8.5.3FP131.88%
8.5.3FP431.88%
8.5.3FP331.88%
8.5.2FP331.88%
7.0.3FP131.88%
6.521.25%
8.5.3FP521.25%
8.5.1FP421.25%
6.5.121.25%
6.5.421.25%
5.0.821.25%
7.5.121.25%
6.5.321.25%
7.0.4FP221.25%
Other1811.25%

WinWebMail (135 servers)

Version Number of Servers Percent
4.2.0.12820.74%
3.9.0.71813.33%
4.4.0.11813.33%
4.3.0.1107.41%
3.8.1.3107.41%
3.7.3.164.44%
3.8.6.164.44%
4.1.0.153.70%
3.9.0.142.96%
1.032.22%
4.0.0.132.22%
3.7.6.132.22%
3.8.3.121.48%
3.7.7.321.48%
3.8.5.121.48%
3.8.0.121.48%
3.8.1.121.48%
3.7.5.121.48%
3.8.1.521.48%
Other75.19%

MagicMail (130 servers)

Version Number of Servers Percent
Other130100.00%

Merak (77 servers)

Version Number of Servers Percent
8.9.12127.27%
8.0.31924.68%
7.6.1810.39%
7.4.545.19%
9.0.345.19%
8.3.833.90%
8.5.022.60%
8.0.111.30%
7.4.211.30%
8.9.211.30%
8.3.611.30%
6.1.011.30%
4.4.211.30%
7.6.411.30%
8.3.011.30%
4.2.111.30%
8.9.711.30%
7.6.011.30%
6.0.811.30%
6.0.711.30%
8.9.011.30%
6.0.311.30%
5.8.211.30%
Other00.00%

Kerio (76 servers)

Version Number of Servers Percent
6.7.31519.74%
6.7.01215.79%
6.6.1810.53%
6.6.279.21%
6.7.167.89%
6.5.267.89%
6.5.045.26%
6.3.133.95%
6.4.122.63%
6.3.022.63%
5.7.922.63%
5.7.622.63%
6.5.122.63%
6.7.222.63%
6.0.1011.32%
6.0.811.32%
6.1.411.32%
Other00.00%

Post.Office (60 servers)

Version Number of Servers Percent
4.41728.33%
4.2.21118.33%
4.31016.67%
3.5.3610.00%
4.1.2.446.67%
3.5.135.00%
3.9.223.33%
4.211.67%
4.1.111.67%
3.5.3J11.67%
4.2.1.311.67%
4.111.67%
3.1.211.67%
4.2.1.111.67%
Other00.00%

ArGoSoft (46 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1430.43%
1.8 (1.8.9.5)510.87%
1.8 (1.8.9.1)48.70%
1.8 (1.8.9.3)36.52%
1.8 (1.8.8.8)24.35%
1.8 (1.8.7.3)24.35%
1.8 (1.8.8.7)24.35%
1.8 (1.8.7.6)24.35%
1.8 (1.8.9.2)24.35%
1.8 (1.8.2.1)24.35%
1.8 (1.8.6.1)12.17%
1.8 (1.8.5.8)12.17%
1.8 (1.8.8.4)12.17%
1.8 (1.8.9.4)12.17%
1.8 (1.8.3.5)12.17%
1.8 (1.8.1.7)12.17%
1.8 (1.8.8.9)12.17%
1.8 (1.8.2.5)12.17%
Other00.00%

GroupWise (42 servers)

Version Number of Servers Percent
18.3.11023.81%
18.2.1511.90%
18.1.149.52%
18.4.049.52%
14.2.237.14%
14.2.124.76%
18.1.024.76%
18.2.024.76%
6.5.712.38%
18.0.012.38%
6.5.012.38%
18.3.012.38%
8.0.312.38%
14.2.012.38%
14.0.012.38%
6.5.212.38%
14.2.312.38%
18.0.212.38%
Other00.00%

Gordano Messaging Suite (GMS) (19 servers)

Version Number of Servers Percent
Other19100.00%

OpenVMS (12 servers)

Version Number of Servers Percent
8.4758.33%
7.3325.00%
8.318.33%
8.218.33%
Other00.00%

Trend Micro (8 servers)

Version Number of Servers Percent
5.18450.00%
5.7337.50%
5.5112.50%
Other00.00%

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0250.00%
8.0.3125.00%
5.0.1125.00%
Other00.00%

InterScan VirusWall (4 servers)

Version Number of Servers Percent
Other4100.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Mercury (2 servers)

Version Number of Servers Percent
1.48150.00%
4.x150.00%
Other00.00%

Interscan (1 servers)

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

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
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%




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