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Mail (MX) Server Survey
December 1st, 2022

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 Queried804,432   100.0%
Number of Servers that didn't respond123,91215.40%
    Server didn't open socket120,10514.93%
    Server didn't provide banner3,8070.47%
Server provided banner680,52084.60%
Server banner identifies software in use453,40556.36%

As indicated by the above table, of the 804,432 servers queried, only 453,405 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
Exim275,27960.71%
Postfix148,36332.72%
Sendmail15,7043.46%
MailEnable8,6081.90%
MDaemon1,8960.42%
Microsoft9310.21%
CommuniGate Pro5390.12%
Qmail Toaster4550.10%
IMail3450.08%
XMail3120.07%
OpenSMTPD2630.06%
SurgeSMTP2190.05%
MagicMail1050.02%
Lotus Domino910.02%
WinWebMail630.01%
Merak530.01%
Kerio470.01%
Post.Office450.01%
ArGoSoft290.01%
GroupWise250.01%
Gordano Messaging Suite (GMS)110.00%
OpenVMS60.00%
VisNetic50.00%
Trend Micro40.00%
ModusMail20.00%
Neon Mail Server20.00%
WebSTAR V10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (275,279 servers)

Version Number of Servers Percent
4.95201,65573.25%
4.94.219,7227.16%
4.9614,9865.44%
4.9314,0575.11%
4.923,9281.43%
4.943,0121.09%
Other17,9196.51%

Postfix (148,363 servers)

Version Number of Servers Percent
Other148,363100.00%

Sendmail (15,704 servers)

Version Number of Servers Percent
8.15.25,98738.12%
8.16.13,77224.02%
8.14.71,72110.96%
8.14.41,59010.12%
8.13.87865.01%
8.14.54632.95%
8.14.92421.54%
8.13.12311.47%
8.17.12241.43%
Other6884.38%

MailEnable (8,608 servers)

Version Number of Servers Percent
10.34--3,84744.69%
10.27--4164.83%
10.25--3403.95%
9.00--1922.23%
10.37--1611.87%
10.39--1301.51%
10.31-10.31-1141.32%
10.31--1111.29%
10.40--981.14%
9.00--9.00951.10%
10.42--891.03%
10.42--10.42891.03%
Other2,92633.99%

MDaemon (1,896 servers)

Version Number of Servers Percent
22.0.320610.86%
21.5.21347.07%
13.5.11125.91%
22.0.2804.22%
13.0.5753.96%
13.0.4733.85%
11.0.0693.64%
11.0.3673.53%
14.5.2442.32%
16.5.2422.22%
19.5.4402.11%
19.5.5371.95%
12.5.6321.69%
21.0.3311.64%
21.5.1301.58%
22.0.0281.48%
10.0.0261.37%
21.0.1211.11%
21.0.2201.05%
12.5.4201.05%
22.0.1191.00%
Other69036.39%

Microsoft (931 servers)

Version Number of Servers Percent
6.0.3790.467528130.18%
8.5.9600.1638413314.29%
10.0.14393.416911512.35%
10.0.17763.1697929.88%
7.5.7601.17514697.41%
5.0.2195.5329485.16%
6.0.3790.3959434.62%
8.0.9200.16384252.69%
5.0.2195.6713161.72%
7.0.6002.18264131.40%
10.0.14393.0121.29%
10.0.17763.1121.29%
Other727.73%

CommuniGate Pro (539 servers)

Version Number of Servers Percent
6.2.156512.06%
6.2.14509.28%
6.1.20224.08%
6.3.15213.90%
6.3.14213.90%
6.0.11122.23%
6.0.9122.23%
6.3.13122.23%
6.1.16122.23%
6.1.18112.04%
5.4.11101.86%
5.2.2091.67%
6.2.1691.67%
5.1.1681.48%
7.1.281.48%
6.2.1281.48%
6.3.681.48%
7.1.171.30%
6.3.961.11%
6.3.1161.11%
6.3.561.11%
Other21640.07%

Qmail Toaster (455 servers)

Version Number of Servers Percent
1.337181.54%
1.038017.58%
Other40.88%

IMail (345 servers)

Version Number of Servers Percent
12.5.8.414412.75%
12.5.6.101329.28%
12.5.7.59267.54%
9.23246.96%
12.5.8.58195.51%
12.4.1.15174.93%
12.6.0.17174.93%
12.5.8.59164.64%
8.05144.06%
12.5.6.105144.06%
8.22123.48%
12.5.3.93123.48%
10.02113.19%
8.15113.19%
12.5.8.54102.90%
12.3.0.10082.32%
12.5.4.14651.45%
12.5.5.11751.45%
12.5.5.11551.45%
11.541.16%
Other3911.30%

XMail (312 servers)

Version Number of Servers Percent
1.2718258.33%
1.228226.28%
1.26134.17%
1.25134.17%
1.2492.88%
1.1561.92%
Other72.24%

OpenSMTPD (263 servers)

Version Number of Servers Percent
Other263100.00%

SurgeSMTP (219 servers)

Version Number of Servers Percent
7.6j-13817.35%
7.3o4-42511.42%
7.6s-1188.22%
7.3e2-2167.31%
7.5c-1146.39%
7.5a-1104.57%
7.1e-183.65%
7.4o-183.65%
7.4e-173.20%
7.6h-273.20%
6.5a2-262.74%
7.6d-162.74%
7.6m-162.74%
6.7c-162.74%
7.3i2-241.83%
3.9e-131.37%
Other3716.89%

MagicMail (105 servers)

Version Number of Servers Percent
Other105100.00%

Lotus Domino (91 servers)

Version Number of Servers Percent
8.5.31718.68%
8.5.3FP61314.29%
7.066.59%
8.5.155.49%
7.0.344.40%
8.5.2FP244.40%
7.0.233.30%
8.5.1FP522.20%
7.0.4FP222.20%
6.5.322.20%
7.5.122.20%
8.0.122.20%
8.5.2FP322.20%
6.522.20%
8.5.222.20%
8.022.20%
8.5.3FP422.20%
8.5.2FP122.20%
8.5.3FP511.10%
5.0.1111.10%
8.5.3FP211.10%
6.5.4FP211.10%
7.0.3FP111.10%
6.5.211.10%
8.5.1FP311.10%
8.5.3FP111.10%
7.0.4FP111.10%
6.5.111.10%
8.5.1FP411.10%
8.5.3FP6HF121511.10%
5.0.811.10%
8.5.2FP411.10%
5.0.13a11.10%
6.5.411.10%
8.5.3FP311.10%
Other00.00%

WinWebMail (63 servers)

Version Number of Servers Percent
4.2.0.11219.05%
3.9.0.71117.46%
4.4.0.1914.29%
3.8.6.146.35%
3.7.3.146.35%
4.3.0.146.35%
4.1.0.134.76%
3.8.1.334.76%
4.0.0.123.17%
3.8.1.523.17%
3.8.0.123.17%
3.9.3.111.59%
3.8.5.111.59%
3.9.2.111.59%
1.011.59%
3.7.6.111.59%
3.9.2.211.59%
3.7.5.111.59%
Other00.00%

Merak (53 servers)

Version Number of Servers Percent
8.0.31426.42%
8.9.11324.53%
7.6.1713.21%
8.3.835.66%
7.4.535.66%
9.0.323.77%
7.4.411.89%
8.9.011.89%
7.0.111.89%
6.0.811.89%
8.5.011.89%
7.6.011.89%
8.9.711.89%
6.1.011.89%
8.3.611.89%
8.9.211.89%
5.8.211.89%
Other00.00%

Kerio (47 servers)

Version Number of Servers Percent
6.7.31123.40%
6.6.1612.77%
6.6.2612.77%
6.7.0510.64%
6.7.148.51%
6.5.248.51%
6.3.024.26%
6.7.224.26%
6.5.124.26%
6.0.1012.13%
5.7.912.13%
6.3.112.13%
6.0.812.13%
6.5.012.13%
Other00.00%

Post.Office (45 servers)

Version Number of Servers Percent
4.41431.11%
4.3920.00%
4.2.2920.00%
4.1.2.436.67%
3.9.224.44%
3.5.324.44%
4.212.22%
4.1.112.22%
3.5.3J12.22%
4.112.22%
3.1.212.22%
4.2.1.112.22%
Other00.00%

ArGoSoft (29 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)827.59%
1.8 (1.8.9.3)310.34%
1.8 (1.8.9.5)310.34%
1.8 (1.8.8.8)26.90%
1.8 (1.8.7.3)26.90%
1.8 (1.8.9.1)26.90%
1.8 (1.8.6.1)13.45%
1.8 (1.8.1.7)13.45%
1.8 (1.8.8.7)13.45%
1.8 (1.8.8.4)13.45%
1.8 (1.8.6.0)13.45%
1.8 (1.8.9.4)13.45%
1.8 (1.8.2.1)13.45%
1.8 (1.8.9.2)13.45%
1.8 (1.8.2.5)13.45%
Other00.00%

GroupWise (25 servers)

Version Number of Servers Percent
18.2.1416.00%
18.4.0416.00%
18.3.1416.00%
18.1.128.00%
14.2.114.00%
14.2.314.00%
18.0.014.00%
6.5.014.00%
14.2.014.00%
8.0.314.00%
18.4.114.00%
14.2.214.00%
14.0.014.00%
18.2.014.00%
18.0.214.00%
Other00.00%

Gordano Messaging Suite (GMS) (11 servers)

Version Number of Servers Percent
Other11100.00%

OpenVMS (6 servers)

Version Number of Servers Percent
8.4350.00%
7.3233.33%
8.2116.67%
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 (4 servers)

Version Number of Servers Percent
5.7250.00%
5.18250.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Neon Mail Server (2 servers)

Version Number of Servers Percent
3.0.7150.00%
3.1.2150.00%
Other00.00%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.4.11100.00%
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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