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Mail (MX) Server Survey
January 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 Queried1,093,148   100.0%
Number of Servers that didn't respond183,74716.81%
    Server didn't open socket178,66016.34%
    Server didn't provide banner5,0870.47%
Server provided banner909,40183.19%
Server banner identifies software in use573,23252.44%

As indicated by the above table, of the 1,093,148 servers queried, only 573,232 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
Exim330,94857.73%
Postfix199,80134.86%
Sendmail21,4083.73%
MailEnable11,5522.02%
MDaemon3,7000.65%
Microsoft1,9030.33%
CommuniGate Pro8070.14%
IMail6130.11%
XMail4540.08%
Qmail Toaster4380.08%
OpenSMTPD3270.06%
SurgeSMTP3100.05%
WinWebMail2240.04%
Lotus Domino2020.04%
MagicMail1190.02%
Kerio1000.02%
Merak990.02%
Post.Office790.01%
ArGoSoft540.01%
GroupWise320.01%
Gordano Messaging Suite (GMS)200.00%
Trend Micro160.00%
OpenVMS60.00%
VisNetic60.00%
Interscan30.00%
WebSTAR V30.00%
InterScan VirusWall30.00%
ModusMail20.00%
MessageWall10.00%
WebSTAR10.00%
Mercury10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (330,948 servers)

Version Number of Servers Percent
4.93248,38375.05%
4.9419,1725.79%
4.9113,8624.19%
4.929,5412.88%
4.92.36,9092.09%
4.894,9361.49%
4.93.0.44,6281.40%
4.873,9731.20%
4.843,7771.14%
Other15,7674.76%

Postfix (199,801 servers)

Version Number of Servers Percent
Other199,801100.00%

Sendmail (21,408 servers)

Version Number of Servers Percent
8.15.210,37748.47%
8.14.43,45316.13%
8.14.72,0239.45%
8.13.81,5307.15%
8.14.51,2645.90%
8.14.96382.98%
8.13.14201.96%
8.14.33261.52%
8.16.12981.39%
Other1,0795.04%

MailEnable (11,552 servers)

Version Number of Servers Percent
10.27--2,91325.22%
10.25--2,25119.49%
9.00--4223.65%
10.31--3052.64%
10.31-10.31-2752.38%
10.29--2542.20%
10.31--10.312151.86%
10.30--2011.74%
9.16--1591.38%
10.12--1581.37%
9.00--9.001311.13%
8.60--1261.09%
Other4,14235.86%

MDaemon (3,700 servers)

Version Number of Servers Percent
20.0.342011.35%
19.5.53158.51%
13.5.12426.54%
13.6.32155.81%
13.0.51504.05%
13.0.41373.70%
11.0.01293.49%
11.0.31283.46%
16.5.2992.68%
14.5.2752.03%
12.5.6742.00%
19.5.4721.95%
12.5.4651.76%
20.0.2531.43%
10.0.0431.16%
15.0.3431.16%
10.1.2401.08%
16.0.4381.03%
Other1,36236.81%

Microsoft (1,903 servers)

Version Number of Servers Percent
6.0.3790.467569336.42%
8.5.9600.1638430215.87%
7.5.7601.1751420610.83%
10.0.14393.26081739.09%
6.0.3790.3959995.20%
10.0.17763.1985.15%
5.0.2195.5329693.63%
8.0.9200.16384542.84%
5.0.2195.6713311.63%
6.0.3790.1830311.63%
7.0.6002.18264261.37%
5.0.2195.7381211.10%
Other1005.25%

CommuniGate Pro (807 servers)

Version Number of Servers Percent
6.2.14485.95%
6.2.15.485.95%
6.2.14.394.83%
6.2.15232.85%
5.3.13.222.73%
6.1.20.212.60%
6.2.12202.48%
6.0.11.182.23%
6.1.16.161.98%
6.1.18151.86%
6.1.20151.86%
5.4.11151.86%
5.2.20.141.73%
6.1.16141.73%
5.1.16141.73%
6.3.3131.61%
6.2.12.91.12%
6.0.1191.12%
Other43453.78%

IMail (613 servers)

Version Number of Servers Percent
12.5.8.419415.33%
12.5.6.1017011.42%
12.5.7.596710.93%
12.4.1.15477.67%
8.22335.38%
12.5.3.93325.22%
9.23315.06%
12.3.0.100254.08%
12.5.5.115254.08%
8.05223.59%
12.5.6.105223.59%
8.15213.43%
10.02121.96%
12.5.5.117111.79%
12.5.4.146101.63%
11.581.31%
7.1581.31%
11.0381.31%
12.5.7.5881.31%
Other599.62%

XMail (454 servers)

Version Number of Servers Percent
1.2723752.20%
1.2214632.16%
1.26194.19%
1.25194.19%
1.24112.42%
1.1551.10%
Other173.74%

Qmail Toaster (438 servers)

Version Number of Servers Percent
1.332073.06%
1.0310824.66%
1.03.561.37%
Other40.91%

OpenSMTPD (327 servers)

Version Number of Servers Percent
Other327100.00%

SurgeSMTP (310 servers)

Version Number of Servers Percent
7.4o-15317.10%
7.3o4-44715.16%
7.5a-1216.77%
7.3e2-2196.13%
7.1e-1144.52%
7.4e-1144.52%
7.3i2-2134.19%
6.5a2-2123.87%
7.4m-1103.23%
6.7c-192.90%
7.2a-172.26%
7.4g-161.94%
3.9e-161.94%
7.2i-161.94%
7.4q-151.61%
6.9c-141.29%
7.2e-241.29%
Other6019.35%

WinWebMail (224 servers)

Version Number of Servers Percent
4.2.0.15022.32%
3.9.0.73816.96%
3.8.1.32410.71%
3.8.0.1156.70%
3.9.0.1135.80%
4.3.0.1114.91%
4.1.0.173.12%
4.0.0.173.12%
3.8.1.162.68%
3.9.2.162.68%
3.7.6.152.23%
3.8.6.152.23%
3.8.5.141.79%
3.8.1.541.79%
1.041.79%
3.8.3.141.79%
3.7.7.341.79%
3.7.3.141.79%
3.7.0.331.34%
Other104.46%

Lotus Domino (202 servers)

Version Number of Servers Percent
8.5.3FP64220.79%
8.5.33718.32%
8.5.2115.45%
8.5.2FP2104.95%
7.0.283.96%
7.073.47%
8.5.162.97%
8.5.3FP152.48%
8.552.48%
7.0.352.48%
6.5.341.98%
8.5.3FP541.98%
8.5.3FP441.98%
8.5.2FP431.49%
5.0.831.49%
8.5.2FP331.49%
7.0.3FP131.49%
6.531.49%
Other3919.31%

MagicMail (119 servers)

Version Number of Servers Percent
Other119100.00%

Kerio (100 servers)

Version Number of Servers Percent
6.7.32121.00%
6.7.01313.00%
6.6.21010.00%
6.7.21010.00%
6.6.199.00%
6.7.188.00%
6.5.266.00%
6.5.055.00%
6.4.144.00%
6.3.122.00%
5.7.922.00%
5.7.622.00%
6.5.122.00%
6.0.1011.00%
6.4.011.00%
6.0.811.00%
6.1.411.00%
6.6.011.00%
6.1.011.00%
Other00.00%

Merak (99 servers)

Version Number of Servers Percent
8.0.32626.26%
8.9.12424.24%
7.6.188.08%
8.5.055.05%
9.0.355.05%
7.4.555.05%
8.3.844.04%
7.6.422.02%
6.0.822.02%
7.0.122.02%
7.6.022.02%
7.5.222.02%
6.1.011.01%
4.2.111.01%
5.8.211.01%
8.9.711.01%
8.0.111.01%
6.2.111.01%
7.4.411.01%
8.3.611.01%
8.9.211.01%
8.9.011.01%
6.0.711.01%
6.0.311.01%
Other00.00%

Post.Office (79 servers)

Version Number of Servers Percent
4.42329.11%
4.31721.52%
4.2.21417.72%
3.5.378.86%
4.1.2.456.33%
3.9.222.53%
4.0.122.53%
4.111.27%
3.1.2J11.27%
3.1.211.27%
4.1.111.27%
4.1.0.311.27%
3.9.1.311.27%
3.6.211.27%
3.5.3J11.27%
4.211.27%
Other00.00%

ArGoSoft (54 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1425.93%
1.8 (1.8.9.5)1018.52%
1.8 (1.8.9.3)916.67%
1.8 (1.8.9.1)47.41%
1.8 (1.8.9.2)23.70%
1.8 (1.8.8.8)23.70%
1.8 (1.8.7.3)23.70%
1.8 (1.8.1.1)11.85%
1.8 (1.8.9.4)11.85%
1.8 (1.8.6.0)11.85%
1.8 (1.8.2.1)11.85%
1.8 (1.8.8.7)11.85%
1.8 (1.8.8.4)11.85%
1.8 (1.8.5.8)11.85%
1.8 (1.8.7.6)11.85%
1.8 (1.8.8.9)11.85%
1.8 (1.8.6.1)11.85%
1.8 (1.8.2.5)11.85%
Other00.00%

GroupWise (32 servers)

Version Number of Servers Percent
18.2.1618.75%
18.2.0412.50%
18.1.1412.50%
14.2.239.38%
14.2.139.38%
14.2.026.25%
14.2.326.25%
18.1.026.25%
14.0.013.12%
6.5.013.12%
7.0.113.12%
18.0.213.12%
18.0.013.12%
6.0.213.12%
Other00.00%

Gordano Messaging Suite (GMS) (20 servers)

Version Number of Servers Percent
Other20100.00%

Trend Micro (16 servers)

Version Number of Servers Percent
5.7637.50%
5.18637.50%
7.5212.50%
7.5ready16.25%
5.516.25%
Other00.00%

OpenVMS (6 servers)

Version Number of Servers Percent
8.4350.00%
7.3233.33%
8.2116.67%
Other00.00%

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%

Interscan (3 servers)

Version Number of Servers Percent
3.8-Build_3013133.33%
3.8-Build_1080133.33%
3.81-Build_1022133.33%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.1266.67%
5.3.2133.33%
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%

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
Other00.00%




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