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Mail (MX) Server Survey
February 1st, 2023

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 Queried789,515   100.0%
Number of Servers that didn't respond132,76916.82%
    Server didn't open socket130,54616.53%
    Server didn't provide banner2,2230.28%
Server provided banner656,74683.18%
Server banner identifies software in use435,76155.19%

As indicated by the above table, of the 789,515 servers queried, only 435,761 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
Exim259,55959.56%
Postfix147,29533.80%
Sendmail15,5893.58%
MailEnable8,2681.90%
MDaemon1,8720.43%
Microsoft8860.20%
CommuniGate Pro5020.12%
IMail3320.08%
XMail3030.07%
OpenSMTPD2670.06%
SurgeSMTP2250.05%
Qmail Toaster1510.03%
MagicMail1040.02%
Lotus Domino910.02%
WinWebMail770.02%
Merak560.01%
Kerio510.01%
Post.Office480.01%
ArGoSoft280.01%
GroupWise270.01%
Gordano Messaging Suite (GMS)90.00%
OpenVMS60.00%
VisNetic50.00%
Trend Micro30.00%
ModusMail20.00%
Interscan10.00%
Mercury10.00%
Neon Mail Server10.00%
Mirapoint10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (259,559 servers)

Version Number of Servers Percent
4.95191,48073.77%
4.9620,7487.99%
4.94.213,7995.32%
4.9310,1053.89%
4.923,8031.47%
4.942,7261.05%
Other16,8986.51%

Postfix (147,295 servers)

Version Number of Servers Percent
Other147,295100.00%

Sendmail (15,589 servers)

Version Number of Servers Percent
8.15.25,99638.46%
8.16.13,72523.90%
8.14.71,72411.06%
8.14.41,56110.01%
8.13.87604.88%
8.14.54232.71%
8.14.92481.59%
8.17.12471.58%
8.13.12271.46%
Other6784.35%

MailEnable (8,268 servers)

Version Number of Servers Percent
10.42--3,12137.75%
10.34--7238.74%
10.27--3654.41%
10.25--3063.70%
10.43-10.43-2332.82%
10.43--2142.59%
10.43--10.431752.12%
9.00--1662.01%
10.31--1011.22%
9.00--9.00951.15%
Other2,76933.49%

MDaemon (1,872 servers)

Version Number of Servers Percent
22.0.327514.69%
21.5.21256.68%
13.5.11166.20%
13.0.5784.17%
11.0.3653.47%
13.0.4603.21%
11.0.0593.15%
22.0.2573.04%
14.5.2472.51%
16.5.2472.51%
19.5.4442.35%
19.5.5371.98%
12.5.6331.76%
21.0.3291.55%
10.0.0241.28%
21.0.1221.18%
21.5.1211.12%
22.0.0201.07%
21.5.0191.01%
9.6.6191.01%
Other67536.06%

Microsoft (886 servers)

Version Number of Servers Percent
6.0.3790.467526329.68%
8.5.9600.1638412914.56%
10.0.14393.416910611.96%
10.0.17763.16979610.84%
7.5.7601.17514677.56%
6.0.3790.3959465.19%
5.0.2195.5329444.97%
8.0.9200.16384222.48%
5.0.2195.6713171.92%
7.0.6002.18264131.47%
10.0.17763.1111.24%
10.0.14393.0101.13%
Other627.00%

CommuniGate Pro (502 servers)

Version Number of Servers Percent
6.2.145410.76%
6.2.15479.36%
6.1.20224.38%
6.3.17163.19%
6.1.16142.79%
6.3.14132.59%
6.0.11122.39%
6.3.16122.39%
6.1.18122.39%
6.0.9122.39%
5.2.20112.19%
5.4.11101.99%
6.2.1291.79%
6.3.681.59%
7.1.171.39%
6.2.1671.39%
6.3.1571.39%
6.3.1371.39%
6.1.1961.20%
Other21643.03%

IMail (332 servers)

Version Number of Servers Percent
12.5.8.414012.05%
12.5.6.101309.04%
12.5.7.59298.73%
12.6.0.17247.23%
9.23236.93%
12.5.8.58185.42%
12.4.1.15154.52%
12.5.6.105144.22%
8.05133.92%
12.5.8.59123.61%
12.5.3.93113.31%
8.15113.31%
8.2292.71%
12.5.8.5492.71%
12.3.0.10092.71%
12.5.4.14661.81%
10.0261.81%
12.5.5.11751.51%
12.5.5.11541.20%
11.541.20%
Other4012.05%

XMail (303 servers)

Version Number of Servers Percent
1.2718360.40%
1.227424.42%
1.25144.62%
1.26134.29%
1.2472.31%
1.1561.98%
Other61.98%

OpenSMTPD (267 servers)

Version Number of Servers Percent
Other267100.00%

SurgeSMTP (225 servers)

Version Number of Servers Percent
7.6j-13515.56%
7.3o4-4229.78%
7.6u-1188.00%
7.3e2-2156.67%
7.5c-1146.22%
7.6s-1135.78%
7.5a-194.00%
7.6h-294.00%
7.4o-183.56%
7.1e-183.56%
7.6d-173.11%
6.5a2-252.22%
7.6m-152.22%
7.4e-141.78%
7.6q-131.33%
3.9e-131.33%
6.7c-131.33%
Other4419.56%

Qmail Toaster (151 servers)

Version Number of Servers Percent
1.037549.67%
1.36945.70%
1.03.563.97%
Other10.66%

MagicMail (104 servers)

Version Number of Servers Percent
Other104100.00%

Lotus Domino (91 servers)

Version Number of Servers Percent
8.5.32123.08%
8.5.3FP61516.48%
7.055.49%
7.0.355.49%
8.5.2FP244.40%
8.5.144.40%
7.0.244.40%
6.533.30%
8.5.2FP122.20%
8.5.3FP122.20%
8.5.3FP422.20%
6.5.122.20%
8.5.1FP522.20%
8.5.2FP322.20%
7.0.4FP222.20%
7.0.3FP122.20%
8.5.3FP211.10%
8.5.3FP6HF121511.10%
8.011.10%
6.5.411.10%
6.0.111.10%
8.5.3FP511.10%
5.0.13a11.10%
5.0.811.10%
7.0.4FP111.10%
5.0.1111.10%
6.5.211.10%
6.5.4FP211.10%
6.5.311.10%
8.5.3FP311.10%
Other00.00%

WinWebMail (77 servers)

Version Number of Servers Percent
4.4.0.11620.78%
3.9.0.71519.48%
4.2.0.11114.29%
4.3.0.156.49%
3.8.6.156.49%
3.7.3.145.19%
3.8.1.345.19%
3.8.0.145.19%
3.8.5.122.60%
4.0.0.122.60%
4.1.0.122.60%
3.8.3.111.30%
1.011.30%
3.7.6.111.30%
3.9.2.111.30%
3.8.1.511.30%
3.8.1.611.30%
3.7.5.111.30%
Other00.00%

Merak (56 servers)

Version Number of Servers Percent
8.0.31526.79%
8.9.11323.21%
7.6.1712.50%
8.3.858.93%
7.4.523.57%
9.0.323.57%
8.0.111.79%
8.9.211.79%
8.3.611.79%
6.1.011.79%
4.2.111.79%
8.9.711.79%
7.6.011.79%
7.4.411.79%
6.0.811.79%
7.0.111.79%
8.9.011.79%
5.8.211.79%
Other00.00%

Kerio (51 servers)

Version Number of Servers Percent
6.7.31121.57%
6.7.0713.73%
6.6.1611.76%
6.7.159.80%
6.5.259.80%
6.6.259.80%
6.7.235.88%
5.7.923.92%
6.3.023.92%
6.5.123.92%
6.0.1011.96%
6.0.811.96%
6.5.011.96%
Other00.00%

Post.Office (48 servers)

Version Number of Servers Percent
4.41837.50%
4.3918.75%
4.2.2816.67%
4.1.2.436.25%
3.5.336.25%
4.224.17%
4.2.1.124.17%
3.9.212.08%
4.112.08%
3.1.212.08%
Other00.00%

ArGoSoft (28 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)828.57%
1.8 (1.8.9.3)414.29%
1.8 (1.8.9.5)310.71%
1.8 (1.8.8.8)27.14%
1.8 (1.8.7.3)27.14%
1.8 (1.8.8.7)27.14%
1.8 (1.8.9.2)27.14%
1.8 (1.8.8.4)13.57%
1.8 (1.8.1.7)13.57%
1.8 (1.8.6.0)13.57%
1.8 (1.8.9.1)13.57%
1.8 (1.8.9.4)13.57%
Other00.00%

GroupWise (27 servers)

Version Number of Servers Percent
18.3.1518.52%
18.2.1414.81%
18.1.127.41%
18.4.127.41%
18.4.027.41%
6.5.713.70%
14.2.113.70%
14.2.313.70%
18.0.013.70%
6.5.013.70%
14.2.013.70%
8.0.313.70%
14.0.013.70%
18.2.013.70%
18.4.213.70%
18.0.213.70%
14.2.213.70%
Other00.00%

Gordano Messaging Suite (GMS) (9 servers)

Version Number of Servers Percent
Other9100.00%

OpenVMS (6 servers)

Version Number of Servers Percent
8.4466.67%
7.3233.33%
Other00.00%

VisNetic (5 servers)

Version Number of Servers Percent
9.3.2.0360.00%
8.0.3120.00%
5.0.1120.00%
Other00.00%

Trend Micro (3 servers)

Version Number of Servers Percent
5.183100.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Interscan (1 servers)

Version Number of Servers Percent
3.8-Build_30131100.00%
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
3.0.71100.00%
Other00.00%

Mirapoint (1 servers)

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

InterScan VirusWall (1 servers)

Version Number of Servers Percent
Other1100.00%




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