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Mail (MX) Server Survey
September 1st, 2020

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 Queried960,243   100.0%
Number of Servers that didn't respond142,38514.83%
    Server didn't open socket139,92314.57%
    Server didn't provide banner2,4620.26%
Server provided banner817,85885.17%
Server banner identifies software in use535,36855.75%

As indicated by the above table, of the 960,243 servers queried, only 535,368 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
Exim326,24160.94%
Postfix169,85831.73%
Sendmail19,5993.66%
MailEnable11,1882.09%
MDaemon3,3350.62%
Microsoft1,7140.32%
CommuniGate Pro6870.13%
IMail5310.10%
Qmail Toaster4540.08%
XMail4310.08%
SurgeSMTP2820.05%
OpenSMTPD2120.04%
Lotus Domino1770.03%
WinWebMail1450.03%
MagicMail1190.02%
Kerio960.02%
Merak920.02%
Post.Office640.01%
GroupWise440.01%
ArGoSoft410.01%
Gordano Messaging Suite (GMS)210.00%
Trend Micro130.00%
VisNetic70.00%
OpenVMS40.00%
InterScan VirusWall30.00%
Mercury20.00%
ModusMail20.00%
Interscan20.00%
WebSTAR V20.00%
Mirapoint10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (326,241 servers)

Version Number of Servers Percent
4.93235,01372.04%
4.9218,6025.70%
4.9115,0854.62%
4.9411,3563.48%
4.92.38,6242.64%
4.93.0.47,3542.25%
4.874,8961.50%
4.894,8921.50%
4.844,0071.23%
Other16,4125.03%

Postfix (169,858 servers)

Version Number of Servers Percent
Other169,858100.00%

Sendmail (19,599 servers)

Version Number of Servers Percent
8.15.29,67549.36%
8.14.43,02715.44%
8.14.71,6668.50%
8.13.81,5157.73%
8.14.51,3927.10%
8.14.96143.13%
8.13.14252.17%
8.14.32881.47%
Other9975.09%

MailEnable (11,188 servers)

Version Number of Servers Percent
10.25--2,61023.33%
10.27--2,42921.71%
9.00--4694.19%
10.29--2862.56%
10.30--2592.31%
10.12--1851.65%
9.16--1651.47%
10.30--10.301581.41%
8.60--1431.28%
9.00--9.001291.15%
10.30-10.30-1211.08%
10.29-10.29-1181.05%
Other4,11636.79%

MDaemon (3,335 servers)

Version Number of Servers Percent
19.5.556416.91%
13.5.12427.26%
13.0.41504.50%
13.0.51484.44%
11.0.01364.08%
11.0.31323.96%
13.6.3962.88%
16.5.2932.79%
12.5.6732.19%
12.5.4722.16%
19.5.4712.13%
14.5.2621.86%
20.0.0601.80%
19.5.3431.29%
10.0.0411.23%
10.1.0401.20%
10.1.2401.20%
19.0.3351.05%
16.0.4351.05%
15.0.3351.05%
13.0.2341.02%
Other1,13333.97%

Microsoft (1,714 servers)

Version Number of Servers Percent
6.0.3790.467570441.07%
8.5.9600.1638426715.58%
7.5.7601.1751418510.79%
10.0.14393.26081367.93%
6.0.3790.3959905.25%
5.0.2195.5329734.26%
10.0.17763.1533.09%
8.0.9200.16384352.04%
5.0.2195.6713301.75%
6.0.3790.1830241.40%
7.0.6002.18264201.17%
Other975.66%

CommuniGate Pro (687 servers)

Version Number of Servers Percent
6.2.147310.63%
6.2.15446.40%
6.1.20294.22%
6.2.12253.64%
5.3.13243.49%
5.2.20213.06%
6.1.16213.06%
6.0.11202.91%
6.1.18202.91%
5.4.11182.62%
6.2.13172.47%
5.1.16172.47%
6.0.9152.18%
6.0.791.31%
6.2.1091.31%
6.1.981.16%
6.2.781.16%
6.1.1281.16%
4.2.1071.02%
6.2.171.02%
6.2.971.02%
6.1.1071.02%
Other27339.74%

IMail (531 servers)

Version Number of Servers Percent
12.5.6.1016712.62%
12.5.7.596412.05%
12.5.8.416211.68%
12.4.1.15448.29%
12.5.3.93295.46%
9.23295.46%
8.22285.27%
12.3.0.100264.90%
12.5.5.115234.33%
8.15234.33%
8.05203.77%
12.5.4.146132.45%
12.5.5.117122.26%
10.02112.07%
12.5.6.105101.88%
11.581.51%
11.0361.13%
Other5610.55%

Qmail Toaster (454 servers)

Version Number of Servers Percent
1.335277.53%
1.038919.60%
1.03.561.32%
Other71.54%

XMail (431 servers)

Version Number of Servers Percent
1.2721048.72%
1.2215034.80%
1.26235.34%
1.25194.41%
1.24102.32%
1.1551.16%
Other143.25%

SurgeSMTP (282 servers)

Version Number of Servers Percent
7.3o4-46021.28%
7.4o-1289.93%
7.3e2-2279.57%
7.4e-1238.16%
7.1e-1176.03%
7.3i2-2124.26%
6.5a2-2113.90%
3.9e-182.84%
7.2a-172.48%
6.7c-172.48%
7.4m-172.48%
7.4g-151.77%
7.4p-941.42%
6.5a-141.42%
6.9c-141.42%
7.4p-1831.06%
7.2i-131.06%
5.2a-131.06%
7.4f-231.06%
7.0c2-231.06%
7.2e-231.06%
Other4014.18%

OpenSMTPD (212 servers)

Version Number of Servers Percent
Other212100.00%

Lotus Domino (177 servers)

Version Number of Servers Percent
8.5.33218.08%
8.5.3FP63016.95%
8.5.295.08%
7.095.08%
7.0.284.52%
8.5.2FP273.95%
8.5.163.39%
7.0.352.82%
8.5.3FP452.82%
8.5.3FP542.26%
8.5.3FP142.26%
8.5.1FP531.69%
6.5.431.69%
8.5.2FP331.69%
5.0.831.69%
8.0.131.69%
6.5.321.13%
7.5.121.13%
7.0.3FP121.13%
6.521.13%
6.5.521.13%
8.5.2FP421.13%
8.5.3FP221.13%
8.5.2FP121.13%
8.021.13%
7.0.421.13%
8.5.1FP421.13%
8.521.13%
5.0.1321.13%
8.0.221.13%
Other158.47%

WinWebMail (145 servers)

Version Number of Servers Percent
4.2.0.13826.21%
3.9.0.73121.38%
3.8.1.3117.59%
3.8.0.174.83%
3.7.6.164.14%
3.8.6.164.14%
4.0.0.164.14%
3.8.1.142.76%
3.9.2.142.76%
3.9.0.142.76%
3.8.5.142.76%
3.8.1.542.76%
3.8.3.132.07%
3.7.3.132.07%
3.9.5.321.38%
4.1.0.121.38%
3.7.5.121.38%
Other85.52%

MagicMail (119 servers)

Version Number of Servers Percent
Other119100.00%

Kerio (96 servers)

Version Number of Servers Percent
6.7.32323.96%
6.7.01515.62%
6.6.299.38%
6.7.188.33%
6.6.188.33%
6.7.277.29%
6.5.066.25%
6.5.255.21%
6.5.122.08%
5.7.622.08%
5.7.922.08%
6.4.011.04%
6.0.1011.04%
6.3.111.04%
6.0.811.04%
6.6.011.04%
6.4.111.04%
6.0.611.04%
6.1.311.04%
6.1.011.04%
Other00.00%

Merak (92 servers)

Version Number of Servers Percent
8.0.32325.00%
8.9.12223.91%
7.6.11010.87%
8.5.066.52%
7.4.566.52%
8.3.844.35%
9.0.344.35%
6.0.822.17%
7.6.022.17%
8.3.611.09%
8.9.711.09%
7.0.111.09%
7.4.411.09%
7.6.411.09%
7.5.211.09%
5.8.211.09%
4.2.111.09%
8.9.211.09%
6.1.011.09%
8.0.111.09%
4.4.111.09%
8.9.011.09%
Other00.00%

Post.Office (64 servers)

Version Number of Servers Percent
4.31726.56%
4.41421.88%
4.2.21421.88%
4.1.2.469.38%
3.5.334.69%
3.9.223.12%
4.1.123.12%
3.5.3J11.56%
3.6.211.56%
4.1.0.311.56%
4.111.56%
3.1.211.56%
3.1.2J11.56%
Other00.00%

GroupWise (44 servers)

Version Number of Servers Percent
18.1.1511.36%
14.2.249.09%
18.2.049.09%
14.2.149.09%
18.2.149.09%
18.1.036.82%
18.0.236.82%
14.2.336.82%
14.0.124.55%
18.0.024.55%
14.0.024.55%
14.2.024.55%
6.5.012.27%
6.5.712.27%
7.0.112.27%
7.0.212.27%
6.0.212.27%
8.0.212.27%
Other00.00%

ArGoSoft (41 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1126.83%
1.8 (1.8.9.5)717.07%
1.8 (1.8.9.3)512.20%
1.8 (1.8.9.2)24.88%
1.8 (1.8.7.3)24.88%
1.8 (1.8.9.1)24.88%
1.8 (1.8.8.8)24.88%
1.8 (1.8.2.1)24.88%
1.8 (1.8.9.4)12.44%
1.8 (1.8.8.4)12.44%
1.8 (1.8.8.7)12.44%
1.8 (1.8.5.8)12.44%
1.8 (1.8.7.6)12.44%
1.8 (1.8.8.9)12.44%
1.8 (1.8.6.1)12.44%
1.8 (1.8.2.5)12.44%
Other00.00%

Gordano Messaging Suite (GMS) (21 servers)

Version Number of Servers Percent
Other21100.00%

Trend Micro (13 servers)

Version Number of Servers Percent
5.7646.15%
7.5430.77%
5.18323.08%
Other00.00%

VisNetic (7 servers)

Version Number of Servers Percent
9.3.2.0571.43%
8.0.3114.29%
6.2.2.0114.29%
Other00.00%

OpenVMS (4 servers)

Version Number of Servers Percent
8.4250.00%
7.3125.00%
8.3125.00%
Other00.00%

InterScan VirusWall (3 servers)

Version Number of Servers Percent
Other3100.00%

Mercury (2 servers)

Version Number of Servers Percent
3.32150.00%
1.48150.00%
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%
3.8-Build_1080150.00%
Other00.00%

WebSTAR V (2 servers)

Version Number of Servers Percent
5.4.1150.00%
5.3.2150.00%
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%



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