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Mail (MX) Server Survey
April 1st, 2021

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 Queried1,092,362   100.0%
Number of Servers that didn't respond177,14516.22%
    Server didn't open socket174,19515.95%
    Server didn't provide banner2,9500.27%
Server provided banner915,21783.78%
Server banner identifies software in use587,79753.81%

As indicated by the above table, of the 1,092,362 servers queried, only 587,797 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
Exim347,63559.14%
Postfix197,82833.66%
Sendmail21,1593.60%
MailEnable11,8782.02%
MDaemon3,5090.60%
Microsoft1,8670.32%
CommuniGate Pro7900.13%
IMail6260.11%
Qmail Toaster4970.08%
XMail4520.08%
SurgeSMTP3290.06%
OpenSMTPD3130.05%
Lotus Domino1830.03%
WinWebMail1730.03%
MagicMail1250.02%
Kerio1010.02%
Merak910.02%
Post.Office700.01%
ArGoSoft560.01%
GroupWise460.01%
Gordano Messaging Suite (GMS)290.00%
Trend Micro120.00%
OpenVMS80.00%
VisNetic70.00%
InterScan VirusWall30.00%
ModusMail20.00%
Mercury20.00%
Interscan20.00%
MessageWall10.00%
WebSTAR V10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (347,635 servers)

Version Number of Servers Percent
4.93248,23371.41%
4.9438,96711.21%
4.9113,4953.88%
4.929,0692.61%
4.92.36,5461.88%
4.894,7781.37%
4.93.0.43,9261.13%
4.873,7931.09%
4.843,7131.07%
Other15,1154.35%

Postfix (197,828 servers)

Version Number of Servers Percent
Other197,828100.00%

Sendmail (21,159 servers)

Version Number of Servers Percent
8.15.210,36648.99%
8.14.43,16014.93%
8.14.72,25810.67%
8.13.81,4436.82%
8.14.51,2675.99%
8.14.95772.73%
8.13.14101.94%
8.16.14101.94%
8.14.32891.37%
Other9794.63%

MailEnable (11,878 servers)

Version Number of Servers Percent
10.27--3,43128.89%
10.25--2,04817.24%
9.00--4133.48%
10.31--4113.46%
10.31-10.31-2622.21%
10.29--2331.96%
10.31--10.312141.80%
10.30--1931.62%
9.16--1441.21%
10.12--1371.15%
9.00--9.001281.08%
Other4,26435.90%

MDaemon (3,509 servers)

Version Number of Servers Percent
21.0.03148.95%
13.5.12426.90%
20.0.42095.96%
19.5.51975.61%
13.0.51444.10%
20.0.31383.93%
11.0.31293.68%
13.0.41213.45%
13.6.31153.28%
11.0.01143.25%
16.5.2952.71%
12.5.6762.17%
14.5.2722.05%
19.5.4651.85%
12.5.4511.45%
10.1.2401.14%
10.0.0401.14%
15.0.3391.11%
16.0.4381.08%
Other1,27036.19%

Microsoft (1,867 servers)

Version Number of Servers Percent
6.0.3790.467568436.64%
8.5.9600.1638430116.12%
7.5.7601.1751418710.02%
10.0.14393.41691095.84%
6.0.3790.3959995.30%
5.0.2195.5329693.70%
10.0.14393.2608693.70%
10.0.17763.1697623.32%
8.0.9200.16384482.57%
10.0.17763.1412.20%
7.0.6002.18264311.66%
5.0.2195.6713261.39%
6.0.3790.1830251.34%
5.0.2195.7381221.18%
Other945.03%

CommuniGate Pro (790 servers)

Version Number of Servers Percent
6.2.149111.52%
6.2.15769.62%
6.1.20354.43%
6.2.12283.54%
6.0.11273.42%
5.3.13253.16%
5.4.11212.66%
6.1.16212.66%
5.2.20202.53%
6.1.18192.41%
6.3.3172.15%
6.0.9141.77%
5.1.16131.65%
6.1.9101.27%
6.2.10101.27%
6.3.6101.27%
5.2.391.14%
6.0.791.14%
6.3.491.14%
4.2.1091.14%
6.2.1391.14%
Other30838.99%

IMail (626 servers)

Version Number of Servers Percent
12.5.8.4111017.57%
12.5.7.597511.98%
12.5.6.1016610.54%
12.4.1.15528.31%
8.22386.07%
9.23365.75%
12.5.3.93284.47%
8.05243.83%
12.5.5.115223.51%
12.3.0.100213.35%
8.15213.35%
10.02162.56%
12.5.6.105162.56%
12.5.4.146142.24%
12.5.5.117101.60%
Other7712.30%

Qmail Toaster (497 servers)

Version Number of Servers Percent
1.337274.85%
1.0311322.74%
1.03.571.41%
Other51.01%

XMail (452 servers)

Version Number of Servers Percent
1.2723852.65%
1.2214431.86%
1.26204.42%
1.25204.42%
1.24112.43%
1.1551.11%
Other143.10%

SurgeSMTP (329 servers)

Version Number of Servers Percent
7.3o4-44112.46%
7.5a-13911.85%
7.4o-13811.55%
7.3e2-2226.69%
7.1e-1185.47%
7.4e-1154.56%
6.5a2-2144.26%
7.5c-1144.26%
7.3i2-2113.34%
6.7c-1103.04%
7.2i-192.74%
7.5d-261.82%
3.9e-151.52%
7.4m-151.52%
7.2a-151.52%
7.5b-1851.52%
7.5b-2241.22%
6.9c-141.22%
Other6419.45%

OpenSMTPD (313 servers)

Version Number of Servers Percent
Other313100.00%

Lotus Domino (183 servers)

Version Number of Servers Percent
8.5.33820.77%
8.5.3FP63318.03%
8.5.1116.01%
8.5.2105.46%
7.073.83%
7.0.352.73%
7.0.252.73%
8.5.2FP342.19%
8.5.2FP242.19%
8.542.19%
8.5.3FP142.19%
8.5.3FP542.19%
6.5.131.64%
8.5.2FP4HF75931.64%
8.5.3FP431.64%
8.5.1FP531.64%
5.0.821.09%
7.0.3FP121.09%
7.5.121.09%
6.5.321.09%
8.5.2FP421.09%
8.5.3FP321.09%
6.521.09%
8.021.09%
6.5.521.09%
5.0.1321.09%
8.5.2FP121.09%
6.5.421.09%
Other189.84%

WinWebMail (173 servers)

Version Number of Servers Percent
4.2.0.14123.70%
3.9.0.72615.03%
3.8.1.31910.98%
4.3.0.1116.36%
3.8.0.1105.78%
4.1.0.174.05%
4.0.0.174.05%
3.9.0.163.47%
3.8.6.163.47%
3.7.6.152.89%
3.7.3.152.89%
3.8.1.142.31%
3.8.5.131.73%
3.8.1.531.73%
1.031.73%
3.7.7.331.73%
3.8.3.121.16%
3.9.3.121.16%
3.7.0.321.16%
3.9.2.121.16%
Other63.47%

MagicMail (125 servers)

Version Number of Servers Percent
Other125100.00%

Kerio (101 servers)

Version Number of Servers Percent
6.7.32120.79%
6.7.01514.85%
6.7.21211.88%
6.6.21110.89%
6.6.1109.90%
6.7.176.93%
6.5.054.95%
6.5.254.95%
6.4.121.98%
5.7.921.98%
6.3.121.98%
5.7.621.98%
6.5.121.98%
Other54.95%

Merak (91 servers)

Version Number of Servers Percent
8.9.12527.47%
8.0.32325.27%
7.6.188.79%
7.4.555.49%
9.0.344.40%
8.3.844.40%
8.5.044.40%
6.0.822.20%
7.6.022.20%
8.3.611.10%
7.6.411.10%
8.9.011.10%
7.0.111.10%
7.4.411.10%
4.2.111.10%
8.9.711.10%
5.8.211.10%
8.3.011.10%
8.0.111.10%
6.1.011.10%
8.9.211.10%
7.5.211.10%
6.0.311.10%
Other00.00%

Post.Office (70 servers)

Version Number of Servers Percent
4.41724.29%
4.31622.86%
4.2.21318.57%
3.5.3710.00%
4.1.2.445.71%
4.2.1.134.29%
3.9.222.86%
4.1.122.86%
3.5.111.43%
3.6.211.43%
4.1.0.311.43%
4.111.43%
3.1.211.43%
4.211.43%
Other00.00%

ArGoSoft (56 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1526.79%
1.8 (1.8.9.3)1017.86%
1.8 (1.8.9.5)814.29%
1.8 (1.8.8.8)35.36%
1.8 (1.8.7.3)35.36%
1.8 (1.8.9.1)23.57%
1.8 (1.8.9.2)23.57%
1.8 (1.8.8.7)23.57%
1.8 (1.8.8.9)23.57%
1.8 (1.8.5.8)11.79%
1.8 (1.8.7.6)11.79%
1.8 (1.8.8.4)11.79%
1.8 (1.8.2.1)11.79%
1.8 (1.8.6.0)11.79%
1.8 (1.8.6.1)11.79%
1.8 (1.8.1.7)11.79%
1.8 (1.8.9.4)11.79%
1.8 (1.8.2.5)11.79%
Other00.00%

GroupWise (46 servers)

Version Number of Servers Percent
18.1.1919.57%
18.2.1817.39%
18.2.0613.04%
18.1.0510.87%
14.2.036.52%
14.2.236.52%
18.3.024.35%
14.0.024.35%
14.2.324.35%
14.2.124.35%
6.5.712.17%
18.0.012.17%
18.0.212.17%
8.0.212.17%
Other00.00%

Gordano Messaging Suite (GMS) (29 servers)

Version Number of Servers Percent
Other29100.00%

Trend Micro (12 servers)

Version Number of Servers Percent
5.18650.00%
5.7325.00%
5.5216.67%
7.5ready18.33%
Other00.00%

OpenVMS (8 servers)

Version Number of Servers Percent
8.4450.00%
7.3337.50%
8.2112.50%
Other00.00%

VisNetic (7 servers)

Version Number of Servers Percent
9.3.2.0457.14%
8.0.3114.29%
6.2.2.0114.29%
5.0.1114.29%
Other00.00%

InterScan VirusWall (3 servers)

Version Number of Servers Percent
Other3100.00%

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 (2 servers)

Version Number of Servers Percent
3.8-Build_3013150.00%
3.8-Build_1080150.00%
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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