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Mail (MX) Server Survey
February 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 Queried1,011,851   100.0%
Number of Servers that didn't respond157,12615.53%
    Server didn't open socket152,65315.09%
    Server didn't provide banner4,4730.44%
Server provided banner854,72584.47%
Server banner identifies software in use552,27854.58%

As indicated by the above table, of the 1,011,851 servers queried, only 552,278 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
Exim332,90860.28%
Postfix179,31532.47%
Sendmail20,1333.65%
MailEnable11,3912.06%
MDaemon3,3060.60%
Microsoft1,6900.31%
CommuniGate Pro7290.13%
IMail5620.10%
Qmail Toaster4520.08%
XMail4240.08%
SurgeSMTP2930.05%
OpenSMTPD2550.05%
Lotus Domino1900.03%
WinWebMail1260.02%
MagicMail1110.02%
Merak890.02%
Kerio880.02%
Post.Office680.01%
ArGoSoft480.01%
GroupWise440.01%
Gordano Messaging Suite (GMS)180.00%
Trend Micro130.00%
OpenVMS80.00%
VisNetic60.00%
InterScan VirusWall30.00%
ModusMail20.00%
Interscan20.00%
Mercury10.00%
Neon Mail Server10.00%
Mirapoint10.00%
WebSTAR V10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (332,908 servers)

Version Number of Servers Percent
4.93252,51375.85%
4.9419,9676.00%
4.9113,4804.05%
4.929,0482.72%
4.92.36,6381.99%
4.894,6261.39%
4.93.0.44,3661.31%
4.873,8761.16%
4.843,6591.10%
Other14,7354.43%

Postfix (179,315 servers)

Version Number of Servers Percent
Other179,315100.00%

Sendmail (20,133 servers)

Version Number of Servers Percent
8.15.210,11050.22%
8.14.42,94914.65%
8.14.71,9499.68%
8.13.81,3966.93%
8.14.51,2666.29%
8.14.96043.00%
8.13.13951.96%
8.16.12881.43%
8.14.32771.38%
Other8994.47%

MailEnable (11,391 servers)

Version Number of Servers Percent
10.27--3,09927.21%
10.25--2,19119.23%
9.00--4043.55%
10.31--3473.05%
10.31-10.31-2542.23%
10.29--2372.08%
10.31--10.312091.83%
10.30--1931.69%
9.16--1641.44%
10.12--1501.32%
9.00--9.001261.11%
8.60--1251.10%
Other3,89234.17%

MDaemon (3,306 servers)

Version Number of Servers Percent
20.0.346213.97%
19.5.52708.17%
13.5.12176.56%
13.0.51434.33%
13.0.41313.96%
11.0.31243.75%
11.0.01203.63%
13.6.3992.99%
16.5.2942.84%
14.5.2752.27%
12.5.6722.18%
12.5.4621.88%
19.5.4451.36%
20.0.2441.33%
10.0.0401.21%
15.0.3371.12%
16.0.4341.03%
10.1.2341.03%
Other1,20336.39%

Microsoft (1,690 servers)

Version Number of Servers Percent
6.0.3790.467563937.81%
8.5.9600.1638426615.74%
7.5.7601.175141679.88%
10.0.14393.26081589.35%
6.0.3790.3959965.68%
10.0.17763.1814.79%
5.0.2195.5329704.14%
8.0.9200.16384382.25%
6.0.3790.1830261.54%
5.0.2195.6713261.54%
5.0.2195.7381181.07%
7.0.6002.18264171.01%
Other885.21%

CommuniGate Pro (729 servers)

Version Number of Servers Percent
6.2.147610.43%
6.2.15638.64%
6.1.20415.62%
6.2.12263.57%
5.3.13233.16%
6.0.11233.16%
6.1.16223.02%
6.1.18202.74%
5.2.20192.61%
5.1.16182.47%
5.4.11182.47%
6.3.3162.19%
6.0.9131.78%
6.2.13131.78%
6.3.4101.37%
6.2.10101.37%
6.0.791.23%
6.1.981.10%
6.2.981.10%
Other29340.19%

IMail (562 servers)

Version Number of Servers Percent
12.5.8.419116.19%
12.5.7.596711.92%
12.5.6.1015910.50%
12.4.1.15478.36%
9.23335.87%
8.22295.16%
8.05244.27%
12.3.0.100234.09%
12.5.3.93223.91%
12.5.5.115223.91%
8.15213.74%
12.5.6.105162.85%
10.02122.14%
12.5.5.117101.78%
12.5.4.146101.78%
11.581.42%
7.0771.25%
12.5.7.5861.07%
7.1561.07%
Other498.72%

Qmail Toaster (452 servers)

Version Number of Servers Percent
1.334175.44%
1.039721.46%
1.03.571.55%
Other71.55%

XMail (424 servers)

Version Number of Servers Percent
1.2722152.12%
1.2214033.02%
1.26204.72%
1.25174.01%
1.2492.12%
1.1551.18%
Other122.83%

SurgeSMTP (293 servers)

Version Number of Servers Percent
7.3o4-44716.04%
7.4o-14515.36%
7.5a-1268.87%
7.3e2-2227.51%
7.1e-1175.80%
7.4e-1144.78%
6.5a2-2124.10%
7.3i2-2113.75%
6.7c-182.73%
7.5b-1872.39%
3.9e-162.05%
7.2a-162.05%
7.4m-151.71%
7.4g-151.71%
6.9c-141.37%
6.5a-131.02%
7.2i-131.02%
Other5217.75%

OpenSMTPD (255 servers)

Version Number of Servers Percent
Other255100.00%

Lotus Domino (190 servers)

Version Number of Servers Percent
8.5.34021.05%
8.5.3FP63618.95%
8.5.2FP294.74%
7.094.74%
8.5.184.21%
8.5.284.21%
7.0.363.16%
8.5.3FP452.63%
7.0.242.11%
8.5.3FP142.11%
8.5.3FP342.11%
8.531.58%
7.0.431.58%
6.5.431.58%
8.5.3FP531.58%
7.0.3FP131.58%
8.5.2FP331.58%
6.531.58%
7.0.4FP221.05%
8.0.121.05%
6.5.321.05%
7.5.121.05%
5.0.821.05%
8.5.3FP221.05%
8.5.2FP121.05%
8.5.2FP421.05%
6.5.121.05%
8.021.05%
5.0.1321.05%
Other147.37%

WinWebMail (126 servers)

Version Number of Servers Percent
4.2.0.13124.60%
3.9.0.72419.05%
3.8.1.3118.73%
4.3.0.197.14%
3.9.0.153.97%
3.7.6.153.97%
3.8.6.153.97%
4.0.0.153.97%
3.8.1.143.17%
3.8.1.532.38%
3.8.0.132.38%
3.8.5.132.38%
1.032.38%
3.7.3.132.38%
4.1.0.132.38%
3.7.5.121.59%
Other75.56%

MagicMail (111 servers)

Version Number of Servers Percent
Other111100.00%

Merak (89 servers)

Version Number of Servers Percent
8.0.32528.09%
8.9.12224.72%
7.6.1910.11%
9.0.355.62%
7.4.555.62%
8.5.044.49%
8.3.844.49%
7.6.022.25%
6.0.822.25%
8.3.611.12%
8.9.211.12%
8.0.111.12%
6.1.011.12%
4.2.111.12%
5.8.211.12%
8.9.711.12%
7.6.411.12%
7.4.411.12%
7.0.111.12%
8.9.011.12%
Other00.00%

Kerio (88 servers)

Version Number of Servers Percent
6.7.31719.32%
6.7.01213.64%
6.7.21011.36%
6.6.1910.23%
6.7.189.09%
6.6.289.09%
6.5.266.82%
6.5.055.68%
6.3.022.27%
5.7.922.27%
6.4.122.27%
6.0.1011.14%
6.4.011.14%
6.3.111.14%
6.0.811.14%
6.6.011.14%
6.5.111.14%
6.1.011.14%
Other00.00%

Post.Office (68 servers)

Version Number of Servers Percent
4.31826.47%
4.41725.00%
4.2.21420.59%
4.1.2.445.88%
3.5.334.41%
3.9.222.94%
4.1.122.94%
4.2.1.122.94%
3.5.3J11.47%
3.6.211.47%
4.1.0.311.47%
4.111.47%
3.1.211.47%
3.1.2J11.47%
Other00.00%

ArGoSoft (48 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1429.17%
1.8 (1.8.9.5)714.58%
1.8 (1.8.9.3)510.42%
1.8 (1.8.7.3)36.25%
1.8 (1.8.8.8)36.25%
1.8 (1.8.9.1)24.17%
1.8 (1.8.8.7)24.17%
1.8 (1.8.9.2)24.17%
1.8 (1.8.2.1)12.08%
1.8 (1.8.9.4)12.08%
1.8 (1.8.6.0)12.08%
1.8 (1.8.7.6)12.08%
1.8 (1.8.1.7)12.08%
1.8 (1.8.8.4)12.08%
1.8 (1.8.5.8)12.08%
1.8 (1.8.8.9)12.08%
1.8 (1.8.6.1)12.08%
1.8 (1.8.2.5)12.08%
Other00.00%

GroupWise (44 servers)

Version Number of Servers Percent
18.1.1818.18%
18.2.1715.91%
18.2.0511.36%
18.1.049.09%
14.2.236.82%
14.2.136.82%
14.2.324.55%
14.2.024.55%
18.0.024.55%
14.0.024.55%
6.5.012.27%
7.0.112.27%
6.5.712.27%
7.0.212.27%
18.0.212.27%
8.0.212.27%
Other00.00%

Gordano Messaging Suite (GMS) (18 servers)

Version Number of Servers Percent
Other18100.00%

Trend Micro (13 servers)

Version Number of Servers Percent
5.7538.46%
5.18430.77%
7.5215.38%
7.5ready17.69%
7.117.69%
Other00.00%

OpenVMS (8 servers)

Version Number of Servers Percent
8.4562.50%
7.3225.00%
8.2112.50%
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 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%

Interscan (2 servers)

Version Number of Servers Percent
3.8-Build_3013150.00%
3.8-Build_1080150.00%
Other00.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%

Mirapoint (1 servers)

Version Number of Servers Percent
4.4.5-GA1100.00%
Other00.00%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.3.21100.00%
Other00.00%




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