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Mail (MX) Server Survey
February 1st, 2024

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 Queried717,445   100.0%
Number of Servers that didn't respond114,01915.89%
    Server didn't open socket112,56615.69%
    Server didn't provide banner1,4530.20%
Server provided banner603,42684.11%
Server banner identifies software in use391,13154.52%

As indicated by the above table, of the 717,445 servers queried, only 391,131 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
Exim222,05556.77%
Postfix143,55736.70%
Sendmail14,1043.61%
MailEnable7,0201.79%
MDaemon1,5310.39%
Microsoft7250.19%
CommuniGate Pro4850.12%
OpenSMTPD3280.08%
XMail2630.07%
IMail2480.06%
SurgeSMTP2180.06%
Qmail Toaster1230.03%
MagicMail1010.03%
WinWebMail1000.03%
Lotus Domino770.02%
Merak460.01%
Post.Office460.01%
Kerio320.01%
ArGoSoft270.01%
GroupWise160.00%
Gordano Messaging Suite (GMS)70.00%
OpenVMS50.00%
Trend Micro50.00%
ModusMail40.00%
InterScan VirusWall40.00%
VisNetic20.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (222,055 servers)

Version Number of Servers Percent
4.96.2161,26172.62%
4.9612,9055.81%
4.959,4694.26%
4.936,4462.90%
4.96.16,1972.79%
4.94.25,1382.31%
4.974,4382.00%
4.922,6901.21%
Other13,5116.08%

Postfix (143,557 servers)

Version Number of Servers Percent
Other143,557100.00%

Sendmail (14,104 servers)

Version Number of Servers Percent
8.16.14,91834.87%
8.15.24,17329.59%
8.14.71,2148.61%
8.14.41,1958.47%
8.13.85724.06%
8.14.55123.63%
8.17.12962.10%
8.14.92251.60%
8.17.21911.35%
8.13.11521.08%
Other6564.65%

MailEnable (7,020 servers)

Version Number of Servers Percent
10.46--2,84440.51%
10.34--3314.72%
10.43--2964.22%
10.47--2383.39%
10.27--2092.98%
10.47--10.472022.88%
10.25--1802.56%
10.47-10.47-1512.15%
10.43-10.43-1422.02%
10.42--1181.68%
9.00--901.28%
9.00--9.00791.13%
10.45--741.05%
10.31--711.01%
Other1,99528.42%

MDaemon (1,531 servers)

Version Number of Servers Percent
23.5.119712.87%
23.0.2905.88%
23.5.0815.29%
13.5.1724.70%
19.5.4624.05%
13.0.5593.85%
11.0.0543.53%
11.0.3493.20%
23.0.1483.14%
13.0.4432.81%
21.5.4402.61%
14.5.2402.61%
16.5.2301.96%
12.5.6251.63%
22.0.3241.57%
21.5.2221.44%
19.5.5181.18%
10.0.0181.18%
21.0.3161.05%
Other54335.47%

Microsoft (725 servers)

Version Number of Servers Percent
6.0.3790.467517524.14%
10.0.17763.169712316.97%
10.0.14393.41699713.38%
8.5.9600.163848912.28%
7.5.7601.17514486.62%
5.0.2195.5329364.97%
6.0.3790.3959314.28%
8.0.9200.16384182.48%
5.0.2195.6713162.21%
10.0.20348.1111.52%
6.0.3790.183091.24%
5.0.2195.738181.10%
Other648.83%

CommuniGate Pro (485 servers)

Version Number of Servers Percent
6.2.155411.13%
6.2.14387.84%
6.3.17255.15%
6.4.0244.95%
6.4.1173.51%
6.1.20173.51%
6.3.18142.89%
6.3.20132.68%
6.3.19112.27%
6.1.18102.06%
5.4.1191.86%
5.2.2081.65%
6.0.1181.65%
5.1.1681.65%
6.3.1471.44%
7.1.671.44%
6.1.1671.44%
6.3.1561.24%
6.2.1261.24%
6.0.961.24%
6.2.1661.24%
5.2.351.03%
6.2.751.03%
6.3.1351.03%
6.1.1751.03%
6.1.1951.03%
Other15932.78%

OpenSMTPD (328 servers)

Version Number of Servers Percent
Other328100.00%

XMail (263 servers)

Version Number of Servers Percent
1.2716863.88%
1.226524.71%
1.25103.80%
1.2662.28%
1.1541.52%
1.2441.52%
Other62.28%

IMail (248 servers)

Version Number of Servers Percent
12.6.1.42710.89%
12.5.6.101228.87%
12.5.8.41218.47%
12.5.8.59187.26%
9.23156.05%
12.5.6.105145.65%
12.5.3.93135.24%
8.05124.84%
8.22114.44%
12.5.7.59114.44%
12.5.8.5893.63%
12.4.1.1583.23%
12.5.8.5452.02%
12.6.0.2052.02%
12.3.0.10052.02%
12.6.0.1752.02%
12.5.4.14641.61%
12.5.5.11541.61%
10.0241.61%
8.1541.61%
11.541.61%
5.0531.21%
Other249.68%

SurgeSMTP (218 servers)

Version Number of Servers Percent
7.7c-13516.06%
7.7i-1177.80%
7.3o4-4167.34%
7.6j-1156.88%
7.3e2-2115.05%
7.5c-1104.59%
7.5a-183.67%
7.6u-183.67%
7.7g-162.75%
6.9c-162.75%
7.1e-152.29%
7.4o-152.29%
7.7h-352.29%
6.5a2-252.29%
7.6d-152.29%
7.6h-252.29%
7.4e-152.29%
7.2i-141.83%
7.6s-141.83%
6.7c-141.83%
6.5a-131.38%
7.7j-631.38%
7.7j-131.38%
Other3013.76%

Qmail Toaster (123 servers)

Version Number of Servers Percent
1.036956.10%
1.35040.65%
1.03.521.63%
Other21.63%

MagicMail (101 servers)

Version Number of Servers Percent
Other101100.00%

WinWebMail (100 servers)

Version Number of Servers Percent
4.4.0.11717.00%
4.2.0.11515.00%
4.5.0.11111.00%
3.9.0.799.00%
3.8.1.388.00%
3.8.0.166.00%
4.3.0.144.00%
4.1.0.144.00%
3.7.7.333.00%
3.8.1.533.00%
3.7.6.122.00%
3.9.2.122.00%
3.9.0.322.00%
3.8.6.122.00%
3.8.5.122.00%
3.7.3.122.00%
4.0.0.122.00%
3.8.3.111.00%
1.011.00%
3.9.3.111.00%
3.7.0.311.00%
3.7.7.111.00%
3.7.5.111.00%
Other00.00%

Lotus Domino (77 servers)

Version Number of Servers Percent
8.5.3FP61418.18%
8.5.31215.58%
7.067.79%
7.0.345.19%
8.0.145.19%
8.5.233.90%
6.5.333.90%
7.0.233.90%
6.522.60%
8.5.3FP522.60%
8.5.2FP122.60%
8.022.60%
6.5.122.60%
8.5.2FP422.60%
8.5.122.60%
8.5.3FP111.30%
8.511.30%
8.5.3FP6HF121511.30%
6.5.411.30%
8.5.2FP211.30%
5.0.811.30%
7.5.111.30%
7.0.4FP111.30%
8.5.1FP511.30%
6.6.611.30%
6.5.211.30%
7.0.4FP211.30%
8.5.1FP211.30%
6.5.1IF111.30%
Other00.00%

Merak (46 servers)

Version Number of Servers Percent
8.0.31328.26%
8.9.11123.91%
7.6.1715.22%
8.3.836.52%
7.4.524.35%
8.9.212.17%
6.1.012.17%
9.0.312.17%
8.5.012.17%
7.5.212.17%
7.6.412.17%
7.4.412.17%
6.0.812.17%
7.0.112.17%
5.8.212.17%
Other00.00%

Post.Office (46 servers)

Version Number of Servers Percent
4.42350.00%
4.2.2715.22%
4.348.70%
3.5.348.70%
4.1.2.436.52%
3.9.224.35%
4.212.17%
4.0.112.17%
3.1.212.17%
Other00.00%

Kerio (32 servers)

Version Number of Servers Percent
6.7.3825.00%
6.7.1515.62%
6.6.2412.50%
6.6.139.38%
6.7.039.38%
6.6.026.25%
6.7.213.12%
6.4.113.12%
5.7.913.12%
6.5.213.12%
6.5.013.12%
5.7.613.12%
6.5.113.12%
Other00.00%

ArGoSoft (27 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)1140.74%
1.8 (1.8.9.3)414.81%
1.8 (1.8.9.5)414.81%
1.8 (1.8.6.1)13.70%
1.8 (1.8.7.3)13.70%
1.8 (1.8.8.4)13.70%
1.8 (1.8.8.8)13.70%
1.8 (1.8.6.0)13.70%
1.8 (1.8.9.1)13.70%
1.8 (1.8.9.4)13.70%
1.8 (1.8.9.2)13.70%
Other00.00%

GroupWise (16 servers)

Version Number of Servers Percent
18.3.1425.00%
18.5.0212.50%
18.4.216.25%
14.2.116.25%
18.1.116.25%
14.2.316.25%
18.0.016.25%
6.5.016.25%
18.4.116.25%
18.2.116.25%
14.2.216.25%
18.0.216.25%
Other00.00%

Gordano Messaging Suite (GMS) (7 servers)

Version Number of Servers Percent
Other7100.00%

OpenVMS (5 servers)

Version Number of Servers Percent
8.4360.00%
7.3120.00%
8.2120.00%
Other00.00%

Trend Micro (5 servers)

Version Number of Servers Percent
5.18360.00%
5.7120.00%
5.5120.00%
Other00.00%

ModusMail (4 servers)

Version Number of Servers Percent
4.1.361.214100.00%
Other00.00%

InterScan VirusWall (4 servers)

Version Number of Servers Percent
Other4100.00%

VisNetic (2 servers)

Version Number of Servers Percent
8.0.3150.00%
6.2.2.0150.00%
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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