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Mail (MX) Server Survey
May 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 Queried1,084,800   100.0%
Number of Servers that didn't respond179,81916.58%
    Server didn't open socket176,84916.30%
    Server didn't provide banner2,9700.27%
Server provided banner904,98183.42%
Server banner identifies software in use581,20453.58%

As indicated by the above table, of the 1,084,800 servers queried, only 581,204 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
Exim344,02659.19%
Postfix195,37533.62%
Sendmail20,9783.61%
MailEnable11,8072.03%
MDaemon3,3960.58%
Microsoft1,8120.31%
CommuniGate Pro7520.13%
IMail6060.10%
Qmail Toaster4830.08%
XMail4450.08%
SurgeSMTP3290.06%
OpenSMTPD2970.05%
Lotus Domino2050.04%
WinWebMail1690.03%
MagicMail1300.02%
Kerio970.02%
Merak820.01%
Post.Office700.01%
ArGoSoft490.01%
GroupWise370.01%
Gordano Messaging Suite (GMS)220.00%
Trend Micro120.00%
OpenVMS70.00%
VisNetic60.00%
InterScan VirusWall20.00%
Interscan20.00%
ModusMail20.00%
Mercury10.00%
MessageWall10.00%
WebSTAR V10.00%
Neon Mail Server10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (344,026 servers)

Version Number of Servers Percent
4.94158,82146.17%
4.93127,45637.05%
4.9113,2013.84%
4.928,7132.53%
4.92.36,0751.77%
4.894,5791.33%
4.93.0.43,7281.08%
4.873,7021.08%
4.843,4741.01%
Other14,2774.15%

Postfix (195,375 servers)

Version Number of Servers Percent
Other195,375100.00%

Sendmail (20,978 servers)

Version Number of Servers Percent
8.15.210,43149.72%
8.14.43,08514.71%
8.14.72,20010.49%
8.13.81,4086.71%
8.14.51,2455.93%
8.14.95302.53%
8.16.14572.18%
8.13.14021.92%
8.14.32631.25%
Other9574.56%

MailEnable (11,807 servers)

Version Number of Servers Percent
10.27--3,62330.69%
10.25--1,92816.33%
9.00--3823.24%
10.31--3763.18%
10.31-10.31-2241.90%
10.29--2241.90%
10.30--1801.52%
10.31--10.311731.47%
9.16--1421.20%
9.00--9.001271.08%
10.12--1211.02%
10.32--1191.01%
Other4,18835.47%

MDaemon (3,396 servers)

Version Number of Servers Percent
21.0.13179.33%
13.5.12407.07%
19.5.51835.39%
13.0.51394.09%
21.0.01343.95%
20.0.41313.86%
11.0.31283.77%
13.0.41233.62%
11.0.01163.42%
20.0.3952.80%
16.5.2952.80%
19.5.4862.53%
12.5.6752.21%
14.5.2712.09%
12.5.4471.38%
13.6.3441.30%
10.1.2371.09%
16.0.4371.09%
10.0.0371.09%
Other1,26137.13%

Microsoft (1,812 servers)

Version Number of Servers Percent
6.0.3790.467567237.09%
8.5.9600.1638428515.73%
7.5.7601.1751418810.38%
10.0.14393.41691196.57%
6.0.3790.3959965.30%
5.0.2195.5329663.64%
10.0.17763.1697653.59%
10.0.14393.2608563.09%
8.0.9200.16384432.37%
10.0.17763.1361.99%
7.0.6002.18264301.66%
5.0.2195.6713241.32%
6.0.3790.1830241.32%
5.0.2195.7381211.16%
Other874.80%

CommuniGate Pro (752 servers)

Version Number of Servers Percent
6.2.149312.37%
6.2.158210.90%
6.1.20364.79%
6.2.12253.32%
5.3.13233.06%
6.1.16222.93%
5.4.11212.79%
6.0.11192.53%
5.2.20182.39%
6.1.18162.13%
6.0.9141.86%
6.3.3131.73%
5.1.16121.60%
6.3.6101.33%
6.3.5101.33%
5.2.3101.33%
6.0.791.20%
6.1.991.20%
6.2.1081.06%
6.2.781.06%
6.1.1981.06%
Other28638.03%

IMail (606 servers)

Version Number of Servers Percent
12.5.8.4110116.67%
12.5.7.597812.87%
12.5.6.101579.41%
12.4.1.15477.76%
9.23315.12%
8.22315.12%
12.5.3.93264.29%
12.3.0.100254.13%
8.05243.96%
8.15213.47%
12.5.5.115203.30%
10.02182.97%
12.5.6.105162.64%
12.5.4.146121.98%
12.5.5.11791.49%
7.0781.32%
11.581.32%
Other7412.21%

Qmail Toaster (483 servers)

Version Number of Servers Percent
1.336876.19%
1.0310421.53%
1.03.571.45%
Other40.83%

XMail (445 servers)

Version Number of Servers Percent
1.2723552.81%
1.2214131.69%
1.26214.72%
1.25214.72%
1.24102.25%
1.1551.12%
Other122.70%

SurgeSMTP (329 servers)

Version Number of Servers Percent
7.3o4-44914.89%
7.4o-13711.25%
7.5a-13711.25%
7.3e2-2226.69%
7.5c-1175.17%
7.1e-1175.17%
7.4e-1144.26%
7.3i2-2113.34%
6.7c-192.74%
6.5a2-292.74%
7.2i-182.43%
7.5d-761.82%
7.5d-261.82%
7.4m-161.82%
7.5b-2251.52%
3.9e-151.52%
7.2a-151.52%
6.9c-141.22%
Other6218.84%

OpenSMTPD (297 servers)

Version Number of Servers Percent
Other297100.00%

Lotus Domino (205 servers)

Version Number of Servers Percent
8.5.3FP63919.02%
8.5.33517.07%
8.5.1157.32%
7.083.90%
8.5.2FP283.90%
8.5.283.90%
7.0.283.90%
7.0.362.93%
8.5.3FP552.44%
8.5.2FP341.95%
8.5.1FP541.95%
8.5.3FP441.95%
8.5.3FP341.95%
8.541.95%
8.5.3FP141.95%
8.5.2FP4HF75931.46%
6.5.131.46%
Other4320.98%

WinWebMail (169 servers)

Version Number of Servers Percent
4.2.0.14426.04%
3.9.0.72816.57%
3.8.1.31710.06%
4.3.0.1127.10%
3.7.3.163.55%
3.8.0.163.55%
4.0.0.163.55%
3.8.1.152.96%
3.9.0.152.96%
3.8.6.152.96%
3.7.6.142.37%
3.8.1.531.78%
3.7.0.331.78%
1.031.78%
3.7.7.331.78%
4.1.0.131.78%
3.8.5.121.18%
3.8.3.121.18%
3.9.3.121.18%
3.7.5.121.18%
3.9.2.121.18%
Other63.55%

MagicMail (130 servers)

Version Number of Servers Percent
Other130100.00%

Kerio (97 servers)

Version Number of Servers Percent
6.7.32424.74%
6.7.01414.43%
6.6.21212.37%
6.6.199.28%
6.7.277.22%
6.5.066.19%
6.7.155.15%
6.5.244.12%
6.4.133.09%
6.3.022.06%
5.7.922.06%
5.7.622.06%
6.5.122.06%
6.0.1011.03%
6.3.111.03%
6.0.811.03%
6.6.011.03%
6.1.011.03%
Other00.00%

Merak (82 servers)

Version Number of Servers Percent
8.9.12328.05%
8.0.32328.05%
7.6.178.54%
8.3.844.88%
7.4.544.88%
9.0.333.66%
7.6.022.44%
8.5.022.44%
7.5.211.22%
7.6.411.22%
8.9.011.22%
7.0.111.22%
6.0.811.22%
7.4.411.22%
5.8.211.22%
8.9.711.22%
4.2.111.22%
8.3.011.22%
8.9.211.22%
6.1.011.22%
8.3.611.22%
6.0.311.22%
Other00.00%

Post.Office (70 servers)

Version Number of Servers Percent
4.41927.14%
4.31724.29%
4.2.21420.00%
3.5.3710.00%
4.1.2.445.71%
4.1.122.86%
4.2.1.122.86%
3.9.211.43%
3.5.3J11.43%
4.111.43%
3.1.211.43%
4.211.43%
Other00.00%

ArGoSoft (49 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1428.57%
1.8 (1.8.9.3)918.37%
1.8 (1.8.9.5)510.20%
1.8 (1.8.7.3)36.12%
1.8 (1.8.9.2)24.08%
1.8 (1.8.9.1)24.08%
1.8 (1.8.2.1)24.08%
1.8 (1.8.8.7)24.08%
1.8 (1.8.8.8)24.08%
1.8 (1.8.8.9)24.08%
1.8 (1.8.5.8)12.04%
1.8 (1.8.8.4)12.04%
1.8 (1.8.6.0)12.04%
1.8 (1.8.7.6)12.04%
1.8 (1.8.9.4)12.04%
1.8 (1.8.2.5)12.04%
Other00.00%

GroupWise (37 servers)

Version Number of Servers Percent
18.1.1821.62%
18.2.1616.22%
18.1.0410.81%
18.2.0410.81%
14.2.138.11%
18.3.025.41%
18.0.212.70%
14.0.012.70%
14.2.012.70%
6.5.012.70%
7.0.112.70%
8.0.312.70%
6.5.712.70%
14.2.312.70%
18.0.012.70%
14.2.212.70%
Other00.00%

Gordano Messaging Suite (GMS) (22 servers)

Version Number of Servers Percent
Other22100.00%

Trend Micro (12 servers)

Version Number of Servers Percent
5.18433.33%
5.5216.67%
7.5216.67%
5.718.33%
7.5ready18.33%
7.018.33%
7.118.33%
Other00.00%

OpenVMS (7 servers)

Version Number of Servers Percent
8.4571.43%
7.3228.57%
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 (2 servers)

Version Number of Servers Percent
Other2100.00%

Interscan (2 servers)

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

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
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%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
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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