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Mail (MX) Server Survey
May 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 Queried657,418   100.0%
Number of Servers that didn't respond164,69725.05%
    Server didn't open socket163,29524.84%
    Server didn't provide banner1,4020.21%
Server provided banner492,72174.95%
Server banner identifies software in use330,16050.22%

As indicated by the above table, of the 657,418 servers queried, only 330,160 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
Exim198,56760.14%
Postfix109,99333.32%
Sendmail12,3503.74%
MailEnable5,9901.81%
MDaemon1,1690.35%
Microsoft5190.16%
CommuniGate Pro3340.10%
XMail2220.07%
IMail2140.06%
OpenSMTPD1820.06%
SurgeSMTP1700.05%
Qmail Toaster1090.03%
MagicMail900.03%
Lotus Domino530.02%
WinWebMail450.01%
Merak400.01%
Kerio360.01%
Post.Office300.01%
ArGoSoft200.01%
GroupWise120.00%
OpenVMS40.00%
Trend Micro30.00%
ModusMail20.00%
VisNetic20.00%
Gordano Messaging Suite (GMS)10.00%
Mercury10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (198,567 servers)

Version Number of Servers Percent
4.96.2146,64773.85%
4.968,6414.35%
4.97.17,9444.00%
4.957,4123.73%
4.935,7002.87%
4.94.24,2272.13%
4.96.14,2072.12%
4.922,3611.19%
Other11,4285.76%

Postfix (109,993 servers)

Version Number of Servers Percent
Other109,993100.00%

Sendmail (12,350 servers)

Version Number of Servers Percent
8.16.14,99340.43%
8.15.23,35527.17%
8.14.71,0368.39%
8.14.49417.62%
8.13.84873.94%
8.14.52722.20%
8.14.91781.44%
8.17.11751.42%
8.13.11541.25%
8.17.21291.04%
Other6305.10%

MailEnable (5,990 servers)

Version Number of Servers Percent
10.46--2,50141.75%
10.34--2894.82%
10.43--2163.61%
10.27--1772.95%
10.25--1672.79%
10.47--1352.25%
10.43-10.43-1171.95%
10.47--10.471101.84%
10.48--1081.80%
10.42--1001.67%
9.00--9.00841.40%
9.00--811.35%
10.48--10.48791.32%
10.47-10.47-751.25%
Other1,75129.23%

MDaemon (1,169 servers)

Version Number of Servers Percent
23.5.312710.86%
13.5.1655.56%
23.5.2615.22%
23.5.1554.70%
13.0.5453.85%
11.0.3413.51%
11.0.0403.42%
13.0.4363.08%
21.5.4352.99%
19.5.4332.82%
23.5.0302.57%
14.5.2292.48%
23.0.1272.31%
16.5.2262.22%
12.5.6242.05%
23.0.2242.05%
21.5.2201.71%
22.0.3191.63%
19.5.5151.28%
10.1.2131.11%
Other40434.56%

Microsoft (519 servers)

Version Number of Servers Percent
6.0.3790.467512724.47%
10.0.17763.16979818.88%
10.0.14393.41697314.07%
8.5.9600.163846312.14%
7.5.7601.17514356.74%
5.0.2195.5329265.01%
6.0.3790.3959265.01%
5.0.2195.6713142.70%
8.0.9200.1638471.35%
7.0.6002.1822261.16%
10.0.17763.161.16%
Other387.32%

CommuniGate Pro (334 servers)

Version Number of Servers Percent
6.2.153610.78%
6.2.14288.38%
6.4.1154.49%
6.1.20133.89%
6.3.20123.59%
6.3.18113.29%
6.0.9102.99%
6.3.1782.40%
5.2.2072.10%
6.3.672.10%
6.0.1172.10%
6.1.1872.10%
5.4.1161.80%
6.1.1661.80%
6.1.1961.80%
6.3.1451.50%
5.1.751.50%
6.3.941.20%
6.2.1241.20%
5.2.341.20%
5.2.1341.20%
6.2.841.20%
5.1.1641.20%
6.2.1641.20%
Other11735.03%

XMail (222 servers)

Version Number of Servers Percent
1.2713962.61%
1.225122.97%
1.2694.05%
1.2594.05%
1.2441.80%
1.1531.35%
Other73.15%

IMail (214 servers)

Version Number of Servers Percent
12.6.1.43315.42%
9.23198.88%
12.5.8.59167.48%
12.5.8.41125.61%
12.5.7.59115.14%
12.5.6.101115.14%
12.5.3.93104.67%
12.5.6.105104.67%
8.2283.74%
12.5.8.5883.74%
8.0573.27%
12.4.1.1573.27%
8.1562.80%
12.3.0.10062.80%
12.5.5.11552.34%
12.6.0.1752.34%
12.5.4.14641.87%
11.541.87%
12.5.8.5431.40%
6.0431.40%
10.0231.40%
12.6.0.2031.40%
5.0531.40%
12.5.5.11731.40%
8.0031.40%
Other115.14%

OpenSMTPD (182 servers)

Version Number of Servers Percent
Other182100.00%

SurgeSMTP (170 servers)

Version Number of Servers Percent
7.8a-12112.35%
7.7c-1148.24%
7.3o4-4137.65%
7.7i-1127.06%
7.3e2-2105.88%
7.6j-195.29%
7.5a-174.12%
7.5c-174.12%
6.9c-163.53%
7.1e-152.94%
7.6u-152.94%
7.8b-242.35%
7.7g-142.35%
7.4e-142.35%
7.4o-131.76%
7.7h-331.76%
6.5a2-231.76%
7.6d-131.76%
7.6h-231.76%
7.3i2-221.18%
7.7b-321.18%
7.3c3-321.18%
7.6s-121.18%
7.8b-421.18%
7.8b-821.18%
7.3n-121.18%
3.9e-121.18%
6.7c-121.18%
Other169.41%

Qmail Toaster (109 servers)

Version Number of Servers Percent
1.035954.13%
1.34642.20%
1.03.532.75%
Other10.92%

MagicMail (90 servers)

Version Number of Servers Percent
Other90100.00%

Lotus Domino (53 servers)

Version Number of Servers Percent
8.5.3FP61222.64%
8.5.3916.98%
7.047.55%
8.5.2FP123.77%
8.5.3FP123.77%
7.0.323.77%
8.5.123.77%
6.5.323.77%
7.0.223.77%
8.511.89%
6.5.411.89%
6.0.111.89%
8.5.1FP511.89%
8.5.211.89%
5.0.811.89%
8.5.3FP311.89%
8.0.111.89%
8.5.3FP411.89%
7.0.4FP111.89%
8.011.89%
8.5.2FP211.89%
6.5.211.89%
8.5.3FP511.89%
7.0.3FP111.89%
6.511.89%
Other00.00%

WinWebMail (45 servers)

Version Number of Servers Percent
4.4.0.1817.78%
4.2.0.1817.78%
3.9.0.7613.33%
4.5.0.1511.11%
3.8.0.136.67%
3.8.1.336.67%
3.8.6.124.44%
4.3.0.124.44%
1.012.22%
3.7.6.112.22%
3.9.3.112.22%
3.9.2.112.22%
3.9.0.112.22%
3.7.3.112.22%
3.8.1.512.22%
4.0.0.112.22%
Other00.00%

Merak (40 servers)

Version Number of Servers Percent
8.9.11230.00%
8.0.3820.00%
7.6.1717.50%
8.3.837.50%
8.0.112.50%
8.9.212.50%
8.3.612.50%
6.1.012.50%
7.4.512.50%
8.5.012.50%
4.2.112.50%
7.6.012.50%
6.0.812.50%
5.8.212.50%
Other00.00%

Kerio (36 servers)

Version Number of Servers Percent
6.7.3719.44%
6.7.0616.67%
6.6.1513.89%
6.6.2411.11%
6.7.138.33%
6.5.238.33%
5.7.925.56%
6.7.225.56%
6.4.112.78%
6.0.1012.78%
6.0.812.78%
6.5.112.78%
Other00.00%

Post.Office (30 servers)

Version Number of Servers Percent
4.41136.67%
4.2.2723.33%
4.3620.00%
3.5.326.67%
4.213.33%
4.1.2.413.33%
3.9.213.33%
3.1.213.33%
Other00.00%

ArGoSoft (20 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)735.00%
1.8 (1.8.9.3)315.00%
1.8 (1.8.8.8)210.00%
1.8 (1.8.8.7)210.00%
1.8 (1.8.9.2)210.00%
1.8 (1.8.6.1)15.00%
1.8 (1.8.9.1)15.00%
1.8 (1.8.9.4)15.00%
1.8 (1.8.9.5)15.00%
Other00.00%

GroupWise (12 servers)

Version Number of Servers Percent
18.3.1216.67%
6.5.718.33%
14.2.118.33%
14.2.318.33%
18.0.018.33%
18.2.118.33%
14.2.218.33%
18.2.018.33%
24.1.018.33%
18.0.218.33%
18.5.018.33%
Other00.00%

OpenVMS (4 servers)

Version Number of Servers Percent
7.3250.00%
8.4125.00%
8.2125.00%
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%

VisNetic (2 servers)

Version Number of Servers Percent
8.0.3150.00%
9.3.2.0150.00%
Other00.00%

Gordano Messaging Suite (GMS) (1 servers)

Version Number of Servers Percent
Other1100.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
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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