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Mail (MX) Server Survey
March 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 Queried773,395   100.0%
Number of Servers that didn't respond121,49215.71%
    Server didn't open socket119,76315.49%
    Server didn't provide banner1,7290.22%
Server provided banner651,90384.29%
Server banner identifies software in use430,74855.70%

As indicated by the above table, of the 773,395 servers queried, only 430,748 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
Exim253,41058.83%
Postfix148,56834.49%
Sendmail15,5773.62%
MailEnable8,0851.88%
MDaemon1,8880.44%
Microsoft8790.20%
CommuniGate Pro5050.12%
IMail3310.08%
XMail3040.07%
OpenSMTPD2930.07%
SurgeSMTP2280.05%
Qmail Toaster1670.04%
MagicMail1110.03%
WinWebMail810.02%
Lotus Domino810.02%
Merak580.01%
Post.Office480.01%
Kerio470.01%
ArGoSoft320.01%
GroupWise240.01%
Gordano Messaging Suite (GMS)100.00%
OpenVMS50.00%
VisNetic40.00%
Trend Micro40.00%
ModusMail20.00%
Interscan10.00%
Mercury10.00%
Neon Mail Server10.00%
Mirapoint10.00%
WebSTAR V10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (253,410 servers)

Version Number of Servers Percent
4.95174,96969.05%
4.9634,37713.57%
4.94.212,7485.03%
4.939,5353.76%
4.923,5871.42%
Other18,1947.18%

Postfix (148,568 servers)

Version Number of Servers Percent
Other148,568100.00%

Sendmail (15,577 servers)

Version Number of Servers Percent
8.15.25,56335.71%
8.16.14,10926.38%
8.14.71,75611.27%
8.14.41,55910.01%
8.13.87224.64%
8.14.54733.04%
8.17.12721.75%
8.14.92561.64%
8.13.11951.25%
Other6724.31%

MailEnable (8,085 servers)

Version Number of Servers Percent
10.42--2,21327.37%
10.43--1,19114.73%
10.34--6317.80%
10.27--3354.14%
10.25--2853.53%
10.43-10.43-2533.13%
10.43--10.431902.35%
9.00--1461.81%
10.31--981.21%
9.00--9.00891.10%
Other2,65432.83%

MDaemon (1,888 servers)

Version Number of Servers Percent
22.0.325513.51%
21.5.21216.41%
13.5.11156.09%
23.0.0814.29%
13.0.5784.13%
11.0.3653.44%
11.0.0643.39%
13.0.4623.28%
19.5.4583.07%
22.0.2573.02%
14.5.2452.38%
16.5.2452.38%
19.5.5351.85%
12.5.6301.59%
21.0.3281.48%
10.0.0231.22%
12.5.4201.06%
21.0.1191.01%
Other68736.39%

Microsoft (879 servers)

Version Number of Servers Percent
6.0.3790.467523927.19%
8.5.9600.1638414216.15%
10.0.14393.416911312.86%
10.0.17763.16979310.58%
7.5.7601.17514697.85%
6.0.3790.3959445.01%
5.0.2195.5329404.55%
8.0.9200.16384262.96%
5.0.2195.6713171.93%
7.0.6002.18264121.37%
10.0.17763.191.02%
5.0.2195.738191.02%
Other667.51%

CommuniGate Pro (505 servers)

Version Number of Servers Percent
6.2.145110.10%
6.2.15499.70%
6.3.17254.95%
6.1.20224.36%
6.1.18142.77%
6.1.16142.77%
5.4.11132.57%
6.0.11122.38%
6.0.9122.38%
5.2.20112.18%
6.3.14101.98%
6.2.12101.98%
6.3.16101.98%
6.3.681.58%
6.3.1571.39%
7.1.461.19%
6.3.561.19%
7.1.161.19%
6.3.961.19%
6.1.1961.19%
6.3.1361.19%
Other20139.80%

IMail (331 servers)

Version Number of Servers Percent
12.5.8.414212.69%
12.5.7.59309.06%
12.5.6.101257.55%
9.23216.34%
12.6.0.17195.74%
12.5.8.58175.14%
12.5.6.105164.83%
12.4.1.15144.23%
12.5.3.93133.93%
12.5.8.59133.93%
8.05123.63%
8.22113.32%
12.5.8.54103.02%
8.15103.02%
10.0292.72%
12.3.0.10092.72%
12.5.4.14672.11%
12.5.5.11761.81%
12.6.0.1951.51%
12.5.5.11541.21%
11.541.21%
Other3410.27%

XMail (304 servers)

Version Number of Servers Percent
1.2718460.53%
1.227223.68%
1.25144.61%
1.26134.28%
1.2482.63%
1.1561.97%
Other72.30%

OpenSMTPD (293 servers)

Version Number of Servers Percent
Other293100.00%

SurgeSMTP (228 servers)

Version Number of Servers Percent
7.6j-13013.16%
7.6u-12410.53%
7.3o4-4198.33%
7.3e2-2177.46%
7.5c-1125.26%
7.6s-1104.39%
7.5a-193.95%
7.6h-293.95%
7.1e-183.51%
7.4o-173.07%
7.6d-173.07%
7.7c-173.07%
6.5a2-252.19%
7.6m-152.19%
7.6q-141.75%
7.4e-141.75%
7.4m-131.32%
6.5a-131.32%
3.9e-131.32%
6.7c-131.32%
Other3917.11%

Qmail Toaster (167 servers)

Version Number of Servers Percent
1.038953.29%
1.37142.51%
1.03.563.59%
Other10.60%

MagicMail (111 servers)

Version Number of Servers Percent
Other111100.00%

WinWebMail (81 servers)

Version Number of Servers Percent
4.4.0.11518.52%
3.9.0.71417.28%
4.2.0.11417.28%
3.8.1.378.64%
4.3.0.156.17%
3.8.0.156.17%
3.7.3.133.70%
4.1.0.133.70%
3.8.6.133.70%
3.8.1.522.47%
3.9.2.122.47%
3.7.7.311.23%
3.8.3.111.23%
1.011.23%
3.7.6.111.23%
3.8.5.111.23%
3.8.1.611.23%
4.0.0.111.23%
3.7.5.111.23%
Other00.00%

Lotus Domino (81 servers)

Version Number of Servers Percent
8.5.31923.46%
8.5.3FP61214.81%
7.0.356.17%
7.044.94%
6.533.70%
8.5.2FP133.70%
8.5.2FP233.70%
7.0.233.70%
8.5.3FP122.47%
6.5.122.47%
8.5.122.47%
8.5.2FP322.47%
7.5.122.47%
7.0.3FP122.47%
8.011.23%
6.5.411.23%
6.0.111.23%
8.5.3FP511.23%
8.5.2FP411.23%
5.0.811.23%
8.5.3FP311.23%
8.5.3FP411.23%
7.0.4FP111.23%
5.0.1111.23%
8.5.1FP511.23%
8.0.111.23%
6.5.211.23%
6.5.4FP211.23%
7.0.4FP211.23%
8.5.1FP211.23%
6.5.311.23%
Other00.00%

Merak (58 servers)

Version Number of Servers Percent
8.0.31525.86%
8.9.11424.14%
7.6.1712.07%
8.3.858.62%
7.4.523.45%
8.0.111.72%
8.9.211.72%
8.3.611.72%
6.1.011.72%
8.5.011.72%
9.0.311.72%
7.6.411.72%
4.2.111.72%
8.9.711.72%
7.6.011.72%
7.4.411.72%
6.0.811.72%
7.0.111.72%
8.9.011.72%
5.8.211.72%
Other00.00%

Post.Office (48 servers)

Version Number of Servers Percent
4.42041.67%
4.3816.67%
4.2.2816.67%
3.5.348.33%
4.1.2.436.25%
4.224.17%
3.9.212.08%
4.112.08%
3.1.212.08%
Other00.00%

Kerio (47 servers)

Version Number of Servers Percent
6.7.3817.02%
6.7.0714.89%
6.6.1612.77%
6.6.2612.77%
6.7.1510.64%
6.5.248.51%
6.7.236.38%
5.7.924.26%
6.4.124.26%
6.5.124.26%
6.0.1012.13%
6.0.812.13%
Other00.00%

ArGoSoft (32 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1031.25%
1.8 (1.8.9.3)412.50%
1.8 (1.8.9.5)39.38%
1.8 (1.8.8.8)26.25%
1.8 (1.8.7.3)26.25%
1.8 (1.8.9.1)26.25%
1.8 (1.8.8.7)26.25%
1.8 (1.8.9.2)26.25%
1.8 (1.8.6.1)13.12%
1.8 (1.8.8.4)13.12%
1.8 (1.8.1.7)13.12%
1.8 (1.8.6.0)13.12%
1.8 (1.8.9.4)13.12%
Other00.00%

GroupWise (24 servers)

Version Number of Servers Percent
18.3.1416.67%
18.2.1312.50%
18.1.128.33%
18.4.128.33%
18.4.228.33%
6.5.714.17%
14.2.114.17%
14.2.314.17%
18.0.014.17%
6.5.014.17%
8.0.314.17%
14.0.014.17%
18.2.014.17%
18.0.214.17%
14.2.214.17%
18.4.014.17%
Other00.00%

Gordano Messaging Suite (GMS) (10 servers)

Version Number of Servers Percent
Other10100.00%

OpenVMS (5 servers)

Version Number of Servers Percent
8.4360.00%
7.3240.00%
Other00.00%

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0375.00%
8.0.3125.00%
Other00.00%

Trend Micro (4 servers)

Version Number of Servers Percent
5.18375.00%
5.5125.00%
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%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.3.21100.00%
Other00.00%

InterScan VirusWall (1 servers)

Version Number of Servers Percent
Other1100.00%




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