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Mail (MX) Server Survey
September 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 Queried1,398,031   100.0%
Number of Servers that didn't respond302,02621.60%
    Server didn't open socket298,16221.33%
    Server didn't provide banner3,8640.28%
Server provided banner1,096,00578.40%
Server banner identifies software in use707,68450.62%

As indicated by the above table, of the 1,398,031 servers queried, only 707,684 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
Exim398,85356.36%
Postfix260,30936.78%
Sendmail24,6443.48%
MailEnable13,3121.88%
MDaemon3,7340.53%
Microsoft2,0730.29%
CommuniGate Pro9230.13%
IMail7110.10%
OpenSMTPD5890.08%
XMail5330.08%
Qmail Toaster5080.07%
SurgeSMTP3930.06%
WinWebMail2540.04%
Lotus Domino2140.03%
MagicMail1590.02%
Kerio1070.02%
Merak900.01%
Post.Office840.01%
ArGoSoft540.01%
GroupWise510.01%
Gordano Messaging Suite (GMS)410.01%
OpenVMS100.00%
Trend Micro100.00%
InterScan VirusWall70.00%
VisNetic60.00%
Mercury40.00%
ModusMail20.00%
Interscan20.00%
MessageWall20.00%
WebSTAR V20.00%
WebSTAR10.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (398,853 servers)

Version Number of Servers Percent
4.95282,94170.94%
4.94.238,7409.71%
4.9322,5625.66%
4.9612,8293.22%
4.926,8161.71%
4.944,9811.25%
4.914,6521.17%
Other25,3326.35%

Postfix (260,309 servers)

Version Number of Servers Percent
Other260,309100.00%

Sendmail (24,644 servers)

Version Number of Servers Percent
8.15.212,02748.80%
8.14.73,27913.31%
8.14.42,97312.06%
8.13.81,3385.43%
8.16.11,3005.28%
8.14.51,2445.05%
8.13.14101.66%
8.17.14021.63%
8.14.93781.53%
8.14.32561.04%
Other1,0374.21%

MailEnable (13,312 servers)

Version Number of Servers Percent
10.34--5,48841.23%
10.27--6945.21%
10.25--5794.35%
9.00--3512.64%
10.37--3272.46%
10.39--2291.72%
10.31-10.31-2111.59%
10.31--2021.52%
10.40--1411.06%
10.39--10.391401.05%
10.29--1371.03%
Other4,81336.16%

MDaemon (3,734 servers)

Version Number of Servers Percent
21.5.23058.17%
22.0.22566.86%
13.5.12406.43%
13.0.51534.10%
13.0.41383.70%
19.5.41303.48%
11.0.31283.43%
22.0.11273.40%
11.0.01203.21%
22.0.01052.81%
16.5.2902.41%
19.5.5862.30%
21.0.3842.25%
21.5.1792.12%
12.5.6752.01%
14.5.2721.93%
21.0.1481.29%
10.0.0471.26%
12.5.4441.18%
15.0.3391.04%
21.5.0391.04%
21.0.2381.02%
Other1,29134.57%

Microsoft (2,073 servers)

Version Number of Servers Percent
6.0.3790.467563630.68%
8.5.9600.1638432215.53%
10.0.17763.169721810.52%
10.0.14393.416921310.27%
7.5.7601.175141748.39%
6.0.3790.39591175.64%
5.0.2195.5329783.76%
8.0.9200.16384612.94%
5.0.2195.6713321.54%
6.0.3790.1830301.45%
7.0.6002.18264251.21%
10.0.17763.1241.16%
5.0.2195.7381211.01%
Other1225.89%

CommuniGate Pro (923 servers)

Version Number of Servers Percent
6.2.1510511.38%
6.2.14869.32%
6.1.20434.66%
6.3.13313.36%
6.0.11283.03%
5.2.20232.49%
6.3.14212.28%
6.1.16202.17%
6.2.12192.06%
5.4.11181.95%
6.0.9161.73%
6.1.18161.73%
5.1.16151.63%
6.3.6151.63%
7.1.2141.52%
6.3.11141.52%
7.1.1121.30%
6.3.5121.30%
6.3.10111.19%
6.1.11101.08%
6.2.10101.08%
Other38441.60%

IMail (711 servers)

Version Number of Servers Percent
12.5.8.418812.38%
12.5.6.101598.30%
12.5.7.59527.31%
12.5.8.58507.03%
9.23486.75%
12.4.1.15395.49%
12.5.5.115294.08%
8.22283.94%
12.5.3.93283.94%
8.05263.66%
12.5.8.54243.38%
12.5.6.105243.38%
12.5.8.59212.95%
10.02182.53%
12.6.0.17172.39%
12.5.4.146152.11%
8.15141.97%
12.3.0.100141.97%
12.5.5.117131.83%
11.0391.27%
Other9513.36%

OpenSMTPD (589 servers)

Version Number of Servers Percent
Other589100.00%

XMail (533 servers)

Version Number of Servers Percent
1.2730457.04%
1.2215228.52%
1.26224.13%
1.25213.94%
1.24152.81%
Other193.56%

Qmail Toaster (508 servers)

Version Number of Servers Percent
1.334968.70%
1.0314929.33%
1.03.561.18%
Other40.79%

SurgeSMTP (393 servers)

Version Number of Servers Percent
7.6j-17218.32%
7.3o4-44411.20%
7.5c-1287.12%
7.3e2-2215.34%
7.6h-2205.09%
7.4o-1164.07%
7.5a-1164.07%
7.1e-1143.56%
7.6m-1133.31%
7.6d-1123.05%
7.4e-1123.05%
7.3i2-2102.54%
6.5a2-2102.54%
6.7c-171.78%
7.2i-161.53%
7.4m-151.27%
7.2a-151.27%
7.6q-151.27%
6.9c-141.02%
3.9e-141.02%
5.0e4-441.02%
6.5a-141.02%
Other6115.52%

WinWebMail (254 servers)

Version Number of Servers Percent
4.2.0.14116.14%
4.4.0.13714.57%
3.9.0.72811.02%
3.8.1.3218.27%
4.3.0.1218.27%
3.9.0.1187.09%
3.8.0.1135.12%
3.7.3.1103.94%
3.8.1.593.54%
4.1.0.183.15%
4.0.0.172.76%
3.8.6.162.36%
3.7.7.351.97%
3.8.5.141.57%
3.8.1.141.57%
3.9.3.131.18%
3.7.1.131.18%
Other166.30%

Lotus Domino (214 servers)

Version Number of Servers Percent
8.5.3FP64521.03%
8.5.33114.49%
8.5.2104.67%
7.083.74%
8.5.183.74%
7.0.373.27%
8.573.27%
8.5.2FP262.80%
6.552.34%
8.5.3FP352.34%
7.0.252.34%
8.5.3FP541.87%
8.5.3FP141.87%
6.5.341.87%
8.041.87%
6.5.141.87%
7.0.3FP141.87%
8.5.2FP131.40%
8.5.1FP531.40%
8.5.3FP431.40%
6.5.431.40%
8.0.131.40%
8.5.2FP331.40%
Other3516.36%

MagicMail (159 servers)

Version Number of Servers Percent
Other159100.00%

Kerio (107 servers)

Version Number of Servers Percent
6.7.32422.43%
6.7.01514.02%
6.6.21110.28%
6.6.11110.28%
6.7.187.48%
6.5.287.48%
6.7.276.54%
6.5.054.67%
6.4.132.80%
6.3.132.80%
5.7.921.87%
6.3.021.87%
6.0.521.87%
6.5.121.87%
Other43.74%

Merak (90 servers)

Version Number of Servers Percent
8.9.12426.67%
8.0.32224.44%
7.6.188.89%
9.0.355.56%
7.4.544.44%
8.3.844.44%
7.6.422.22%
8.5.022.22%
7.0.122.22%
6.0.822.22%
8.0.111.11%
7.4.211.11%
8.9.211.11%
8.3.611.11%
6.1.011.11%
6.2.111.11%
7.5.211.11%
8.3.011.11%
4.2.111.11%
8.9.711.11%
7.6.011.11%
7.4.411.11%
6.0.711.11%
8.9.011.11%
5.8.211.11%
Other00.00%

Post.Office (84 servers)

Version Number of Servers Percent
4.43136.90%
4.31517.86%
4.2.21315.48%
3.5.367.14%
4.1.2.455.95%
3.5.133.57%
3.9.222.38%
4.222.38%
4.2.1.322.38%
4.1.111.19%
3.5.3J11.19%
4.111.19%
3.1.211.19%
4.2.1.111.19%
Other00.00%

ArGoSoft (54 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1527.78%
1.8 (1.8.9.3)916.67%
1.8 (1.8.9.5)611.11%
1.8 (1.8.8.8)35.56%
1.8 (1.8.9.1)35.56%
1.8 (1.8.7.3)23.70%
1.8 (1.8.8.9)23.70%
1.8 (1.8.8.7)23.70%
1.8 (1.8.7.6)23.70%
1.8 (1.8.5.8)11.85%
1.8 (1.8.8.4)11.85%
1.8 (1.8.6.0)11.85%
1.8 (1.8.1.7)11.85%
1.8 (1.8.9.4)11.85%
1.8 (1.8.3.5)11.85%
1.8 (1.8.2.1)11.85%
1.8 (1.8.9.2)11.85%
1.8 (1.8.5.9)11.85%
1.8 (1.8.2.5)11.85%
Other00.00%

GroupWise (51 servers)

Version Number of Servers Percent
18.3.11427.45%
18.2.1611.76%
18.4.0611.76%
18.1.147.84%
18.1.047.84%
14.2.235.88%
18.2.023.92%
14.0.023.92%
14.2.111.96%
18.4.111.96%
18.0.011.96%
6.5.011.96%
14.2.011.96%
18.3.011.96%
8.0.311.96%
14.2.311.96%
18.0.211.96%
6.0.411.96%
Other00.00%

Gordano Messaging Suite (GMS) (41 servers)

Version Number of Servers Percent
Other41100.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4550.00%
7.3440.00%
8.2110.00%
Other00.00%

Trend Micro (10 servers)

Version Number of Servers Percent
5.18440.00%
5.7330.00%
5.5220.00%
7.0110.00%
Other00.00%

InterScan VirusWall (7 servers)

Version Number of Servers Percent
Other7100.00%

VisNetic (6 servers)

Version Number of Servers Percent
9.3.2.0350.00%
8.0.3116.67%
6.2.2.0116.67%
5.0.1116.67%
Other00.00%

Mercury (4 servers)

Version Number of Servers Percent
1.48250.00%
4.x125.00%
4125.00%
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%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

WebSTAR V (2 servers)

Version Number of Servers Percent
5.4.1150.00%
5.3.2150.00%
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%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%




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