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Mail (MX) Server Survey
February 1st, 2025

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 Queried1,091,211   100.0%
Number of Servers that didn't respond217,98819.98%
    Server didn't open socket215,37819.74%
    Server didn't provide banner2,6100.24%
Server provided banner873,22380.02%
Server banner identifies software in use552,08650.59%

As indicated by the above table, of the 1,091,211 servers queried, only 552,086 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
Exim309,31756.03%
Postfix207,79837.64%
Sendmail18,6903.39%
MailEnable9,9611.80%
MDaemon2,1490.39%
Microsoft1,0730.19%
CommuniGate Pro6920.13%
OpenSMTPD5520.10%
XMail4100.07%
IMail3020.05%
SurgeSMTP3010.05%
Qmail Toaster1810.03%
MagicMail1510.03%
WinWebMail1410.03%
Lotus Domino1020.02%
Post.Office580.01%
Merak530.01%
Kerio500.01%
ArGoSoft360.01%
GroupWise290.01%
Gordano Messaging Suite (GMS)130.00%
OpenVMS90.00%
InterScan VirusWall40.00%
VisNetic30.00%
Trend Micro30.00%
ModusMail20.00%
MessageWall20.00%
WebSTAR10.00%
Mercury10.00%
Mirapoint10.00%
WebSTAR V10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (309,317 servers)

Version Number of Servers Percent
4.96.2161,08852.08%
4.9890,23029.17%
4.969,7063.14%
4.97.19,5553.09%
4.936,9072.23%
4.955,7291.85%
4.94.25,6171.82%
Other20,4856.62%

Postfix (207,798 servers)

Version Number of Servers Percent
Other207,798100.00%

Sendmail (18,690 servers)

Version Number of Servers Percent
8.16.17,52140.24%
8.15.24,31223.07%
8.14.71,8099.68%
8.14.41,4507.76%
8.13.87183.84%
8.18.16703.58%
8.14.55863.14%
8.14.92421.29%
8.17.12341.25%
8.17.1.91951.04%
Other9535.10%

MailEnable (9,961 servers)

Version Number of Servers Percent
10.49--2,42624.35%
10.48--1,60516.11%
10.46--1,14211.46%
10.34--3293.30%
10.43--2362.37%
10.25--2192.20%
10.47--2102.11%
10.27--1891.90%
10.49--10.491671.68%
10.43-10.43-1511.52%
10.48--10.481461.47%
10.49-10.49-1341.35%
10.42--1171.17%
10.47-10.47-1141.14%
9.00--1121.12%
10.47--10.471111.11%
10.48-10.48-1081.08%
Other2,44524.55%

MDaemon (2,149 servers)

Version Number of Servers Percent
24.5.237317.36%
13.5.1874.05%
19.5.4803.72%
13.0.5743.44%
13.0.4723.35%
11.0.3703.26%
11.0.0693.21%
24.5.1663.07%
16.5.2462.14%
14.5.2442.05%
24.5.0371.72%
23.0.2371.72%
12.5.6361.68%
23.0.1331.54%
23.5.3291.35%
21.5.4291.35%
24.0.2271.26%
24.0.1271.26%
10.1.2271.26%
23.5.2261.21%
21.5.2261.21%
22.0.3231.07%
Other81137.74%

Microsoft (1,073 servers)

Version Number of Servers Percent
6.0.3790.467527325.44%
10.0.17763.169721019.57%
10.0.14393.416913312.40%
8.5.9600.1638411510.72%
7.5.7601.17514736.80%
6.0.3790.3959666.15%
5.0.2195.5329413.82%
10.0.20348.1363.36%
5.0.2195.6713181.68%
8.0.9200.16384171.58%
6.0.3790.1830121.12%
10.0.17763.1111.03%
Other686.34%

CommuniGate Pro (692 servers)

Version Number of Servers Percent
6.2.15618.82%
6.2.14466.65%
6.4.1324.62%
6.3.17263.76%
6.1.20253.61%
6.3.20233.32%
6.3.18223.18%
6.4.0192.75%
6.0.11142.02%
6.3.38142.02%
5.1.16131.88%
6.0.9121.73%
5.2.20121.73%
6.1.16121.73%
5.4.11111.59%
6.3.19101.45%
6.3.1491.30%
6.2.1291.30%
6.3.681.16%
6.1.1771.01%
6.3.3971.01%
6.3.3771.01%
6.1.1971.01%
6.3.1671.01%
7.1.871.01%
6.1.1871.01%
Other26538.29%

OpenSMTPD (552 servers)

Version Number of Servers Percent
Other552100.00%

XMail (410 servers)

Version Number of Servers Percent
1.2727266.34%
1.229021.95%
1.26174.15%
1.24102.44%
1.2592.20%
Other122.93%

IMail (302 servers)

Version Number of Servers Percent
12.6.1.45217.22%
9.23247.95%
12.5.6.101237.62%
12.5.8.41227.28%
12.5.8.59175.63%
12.5.7.59144.64%
12.5.3.93144.64%
8.05144.64%
8.22113.64%
12.5.6.105113.64%
12.5.8.5892.98%
12.5.5.11582.65%
12.5.4.14661.99%
7.0761.99%
12.4.1.1561.99%
12.3.0.10061.99%
11.551.66%
12.5.8.5441.32%
8.0041.32%
12.6.0.1741.32%
12.5.5.11741.32%
Other3812.58%

SurgeSMTP (301 servers)

Version Number of Servers Percent
7.8a-13511.63%
7.8k-13210.63%
7.3o4-4247.97%
7.8g-1247.97%
7.8c2-2185.98%
7.7c-1175.65%
7.5c-1154.98%
7.6j-1144.65%
7.3e2-2103.32%
7.1e-192.99%
7.4o-182.66%
7.7i-182.66%
6.9c-182.66%
7.5a-172.33%
6.5a2-261.99%
7.2i-151.66%
7.4e-151.66%
7.6h-241.33%
7.6u-141.33%
Other4815.95%

Qmail Toaster (181 servers)

Version Number of Servers Percent
1.0311664.09%
1.36033.15%
1.03.531.66%
1.03.621.10%
Other00.00%

MagicMail (151 servers)

Version Number of Servers Percent
Other151100.00%

WinWebMail (141 servers)

Version Number of Servers Percent
4.5.0.12719.15%
3.8.1.31812.77%
4.4.0.11812.77%
4.2.0.11611.35%
3.9.0.7139.22%
4.0.0.164.26%
3.8.0.153.55%
4.3.0.153.55%
4.1.0.142.84%
3.7.1.132.13%
3.8.6.132.13%
3.9.0.132.13%
3.7.3.132.13%
3.9.3.121.42%
3.7.7.321.42%
3.9.5.321.42%
Other117.80%

Lotus Domino (102 servers)

Version Number of Servers Percent
8.5.32019.61%
8.5.3FP61514.71%
8.5.265.88%
8.5.154.90%
7.043.92%
8.5.2FP143.92%
6.543.92%
8.5.3FP343.92%
6.5.132.94%
8.532.94%
7.0.232.94%
8.032.94%
6.5.221.96%
7.0.4FP221.96%
7.5.121.96%
7.0.321.96%
Other2019.61%

Post.Office (58 servers)

Version Number of Servers Percent
4.42950.00%
4.2.21017.24%
3.5.358.62%
4.346.90%
4.1.2.435.17%
3.9.223.45%
4.211.72%
3.5.111.72%
3.1.211.72%
4.2.1.111.72%
4.2.1.311.72%
Other00.00%

Merak (53 servers)

Version Number of Servers Percent
8.9.11630.19%
8.0.31120.75%
7.6.1815.09%
8.3.847.55%
7.4.523.77%
6.0.823.77%
8.0.111.89%
8.9.211.89%
6.1.011.89%
9.0.311.89%
8.5.011.89%
7.5.211.89%
7.6.411.89%
7.6.011.89%
7.4.411.89%
5.8.211.89%
Other00.00%

Kerio (50 servers)

Version Number of Servers Percent
6.7.31428.00%
6.6.1714.00%
6.7.0612.00%
6.7.148.00%
6.5.248.00%
6.6.236.00%
6.7.236.00%
5.7.924.00%
6.5.124.00%
5.7.612.00%
6.0.812.00%
6.6.012.00%
6.3.012.00%
6.5.012.00%
Other00.00%

ArGoSoft (36 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1233.33%
1.8 (1.8.9.3)513.89%
1.8 (1.8.9.5)411.11%
1.8 (1.8.9.1)38.33%
1.8 (1.8.7.3)25.56%
1.8 (1.8.8.7)25.56%
1.8 (1.8.9.2)25.56%
1.8 (1.8.8.8)12.78%
1.8 (1.8.3.5)12.78%
1.8 (1.8.6.0)12.78%
1.8 (1.8.9.4)12.78%
1.8 (1.8.5.9)12.78%
1.8 (1.8.8.9)12.78%
Other00.00%

GroupWise (29 servers)

Version Number of Servers Percent
18.3.1517.24%
18.2.1310.34%
24.4.0310.34%
24.3.0310.34%
24.2.0310.34%
18.5.026.90%
18.2.026.90%
14.2.113.45%
24.1.013.45%
18.1.113.45%
14.2.313.45%
18.4.113.45%
18.3.013.45%
18.0.213.45%
14.0.013.45%
Other00.00%

Gordano Messaging Suite (GMS) (13 servers)

Version Number of Servers Percent
Other13100.00%

OpenVMS (9 servers)

Version Number of Servers Percent
8.4555.56%
7.3333.33%
8.2111.11%
Other00.00%

InterScan VirusWall (4 servers)

Version Number of Servers Percent
Other4100.00%

VisNetic (3 servers)

Version Number of Servers Percent
9.3.2.0266.67%
8.0.3133.33%
Other00.00%

Trend Micro (3 servers)

Version Number of Servers Percent
5.18266.67%
5.5133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Mercury (1 servers)

Version Number of Servers Percent
4.x1100.00%
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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