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Mail (MX) Server Survey
July 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 Queried733,485   100.0%
Number of Servers that didn't respond121,06416.51%
    Server didn't open socket119,56316.30%
    Server didn't provide banner1,5010.20%
Server provided banner612,42183.49%
Server banner identifies software in use409,25555.80%

As indicated by the above table, of the 733,485 servers queried, only 409,255 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
Exim241,70259.06%
Postfix141,91734.68%
Sendmail13,9913.42%
MailEnable7,4211.81%
MDaemon1,5110.37%
Microsoft6890.17%
CommuniGate Pro4810.12%
OpenSMTPD2810.07%
XMail2770.07%
IMail2230.05%
SurgeSMTP2060.05%
Qmail Toaster1240.03%
MagicMail1020.02%
WinWebMail690.02%
Lotus Domino690.02%
Post.Office450.01%
Merak440.01%
Kerio400.01%
ArGoSoft260.01%
GroupWise160.00%
OpenVMS60.00%
Gordano Messaging Suite (GMS)40.00%
VisNetic30.00%
ModusMail20.00%
Trend Micro20.00%
Mercury10.00%
WebSTAR10.00%
Mirapoint10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (241,702 servers)

Version Number of Servers Percent
4.96.2145,75660.30%
4.97.147,92019.83%
4.9610,2504.24%
4.957,6263.16%
4.936,5792.72%
4.94.24,9422.04%
4.96.13,3421.38%
4.922,7411.13%
Other12,5465.19%

Postfix (141,917 servers)

Version Number of Servers Percent
Other141,917100.00%

Sendmail (13,991 servers)

Version Number of Servers Percent
8.16.15,74641.07%
8.15.23,51025.09%
8.14.71,2939.24%
8.14.41,1077.91%
8.13.85533.95%
8.14.53212.29%
8.17.12221.59%
8.18.12121.52%
8.14.91901.36%
Other8375.98%

MailEnable (7,421 servers)

Version Number of Servers Percent
10.46--2,53934.21%
10.48--1,01113.62%
10.34--3154.24%
10.43--2313.11%
10.27--1962.64%
10.25--1942.61%
10.47--1872.52%
10.48--10.481321.78%
10.47--10.471201.62%
10.43-10.43-1161.56%
10.42--1101.48%
10.47-10.47-951.28%
10.48-10.48-911.23%
9.00--881.19%
9.00--9.00801.08%
Other1,91625.82%

MDaemon (1,511 servers)

Version Number of Servers Percent
24.0.01449.53%
23.5.31278.41%
13.5.1694.57%
13.0.5573.77%
23.5.1533.51%
11.0.3513.38%
11.0.0513.38%
23.5.2473.11%
13.0.4463.04%
21.5.4412.71%
23.0.1382.51%
16.5.2372.45%
14.5.2362.38%
23.5.0352.32%
23.0.2352.32%
19.5.4301.99%
12.5.6281.85%
22.0.3221.46%
21.5.2191.26%
19.5.5161.06%
10.1.2161.06%
Other51333.95%

Microsoft (689 servers)

Version Number of Servers Percent
6.0.3790.467516824.38%
10.0.17763.169712117.56%
10.0.14393.41699714.08%
8.5.9600.163848111.76%
7.5.7601.17514476.82%
5.0.2195.5329385.52%
6.0.3790.3959375.37%
10.0.20348.1142.03%
8.0.9200.16384131.89%
5.0.2195.6713111.60%
10.0.17763.191.31%
6.0.3790.183071.02%
Other466.68%

CommuniGate Pro (481 servers)

Version Number of Servers Percent
6.2.15449.15%
6.2.14367.48%
6.4.1296.03%
6.3.17214.37%
6.1.20163.33%
6.3.20163.33%
6.3.18142.91%
6.4.0132.70%
6.0.9112.29%
6.3.1991.87%
6.0.1191.87%
5.4.1181.66%
6.1.1681.66%
6.1.1981.66%
7.1.881.66%
6.3.671.46%
6.1.1871.46%
5.1.1671.46%
6.3.1461.25%
5.2.2061.25%
5.1.761.25%
6.3.1361.25%
6.3.1551.04%
5.4.851.04%
6.2.1251.04%
6.2.851.04%
Other16634.51%

OpenSMTPD (281 servers)

Version Number of Servers Percent
Other281100.00%

XMail (277 servers)

Version Number of Servers Percent
1.2717864.26%
1.226322.74%
1.26103.61%
1.25103.61%
1.2441.44%
1.1541.44%
Other82.89%

IMail (223 servers)

Version Number of Servers Percent
12.6.1.43415.25%
12.5.8.41156.73%
12.5.8.59156.73%
9.23146.28%
12.5.6.101146.28%
12.5.3.93125.38%
12.5.7.59114.93%
12.5.8.58104.48%
12.5.6.105104.48%
8.0594.04%
12.4.1.1583.59%
8.2262.69%
12.6.0.2052.24%
8.1552.24%
12.6.0.1752.24%
11.552.24%
12.5.4.14641.79%
10.0241.79%
12.3.0.10041.79%
12.5.8.5431.35%
6.0431.35%
12.5.5.11531.35%
5.0531.35%
12.5.5.11731.35%
8.0031.35%
Other156.73%

SurgeSMTP (206 servers)

Version Number of Servers Percent
7.8a-13918.93%
7.3o4-4188.74%
7.7c-1167.77%
7.7i-1125.83%
7.6j-1125.83%
7.3e2-2115.34%
7.5c-194.37%
7.5a-162.91%
7.1e-162.91%
7.4e-162.91%
6.9c-162.91%
7.4o-152.43%
6.5a2-252.43%
7.6s-152.43%
7.6u-141.94%
7.8b-241.94%
6.7c-141.94%
7.6d-141.94%
7.7h-331.46%
Other3115.05%

Qmail Toaster (124 servers)

Version Number of Servers Percent
1.037258.06%
1.34838.71%
1.03.532.42%
Other10.81%

MagicMail (102 servers)

Version Number of Servers Percent
Other102100.00%

WinWebMail (69 servers)

Version Number of Servers Percent
3.9.0.71217.39%
4.4.0.11217.39%
4.5.0.11217.39%
4.2.0.1811.59%
3.8.1.368.70%
4.3.0.134.35%
3.8.5.122.90%
3.8.0.122.90%
4.0.0.122.90%
3.8.6.122.90%
3.7.3.122.90%
1.011.45%
3.7.6.111.45%
3.9.3.111.45%
3.7.7.311.45%
4.1.0.111.45%
3.7.5.111.45%
Other00.00%

Lotus Domino (69 servers)

Version Number of Servers Percent
8.5.31420.29%
8.5.3FP61217.39%
7.045.80%
7.0.345.80%
8.5.2FP122.90%
8.5.3FP122.90%
8.522.90%
6.5.122.90%
8.5.2FP222.90%
8.5.222.90%
8.0.122.90%
6.5.322.90%
7.5.122.90%
7.0.222.90%
8.5.3FP6HF121511.45%
6.5.411.45%
6.0.111.45%
6.511.45%
5.0.811.45%
7.0.4FP211.45%
8.5.3FP511.45%
7.0.4FP111.45%
8.011.45%
8.5.2FP411.45%
6.6.611.45%
6.5.211.45%
7.0.3FP111.45%
8.5.111.45%
5.0.1311.45%
Other00.00%

Post.Office (45 servers)

Version Number of Servers Percent
4.42453.33%
4.2.2817.78%
3.5.336.67%
4.336.67%
4.1.2.436.67%
3.9.224.44%
4.212.22%
3.1.212.22%
Other00.00%

Merak (44 servers)

Version Number of Servers Percent
8.9.11227.27%
8.0.3920.45%
7.6.1715.91%
8.3.849.09%
8.0.112.27%
8.9.212.27%
8.3.612.27%
6.1.012.27%
7.4.512.27%
9.0.312.27%
8.5.012.27%
4.2.112.27%
7.6.012.27%
7.4.412.27%
6.0.812.27%
5.8.212.27%
Other00.00%

Kerio (40 servers)

Version Number of Servers Percent
6.7.3922.50%
6.6.1717.50%
6.7.0615.00%
6.7.1410.00%
6.5.237.50%
6.6.237.50%
5.7.925.00%
6.5.125.00%
6.4.112.50%
6.0.1012.50%
6.0.812.50%
6.7.212.50%
Other00.00%

ArGoSoft (26 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)830.77%
1.8 (1.8.9.3)415.38%
1.8 (1.8.9.5)311.54%
1.8 (1.8.8.8)27.69%
1.8 (1.8.7.3)27.69%
1.8 (1.8.8.7)27.69%
1.8 (1.8.9.2)27.69%
1.8 (1.8.6.0)13.85%
1.8 (1.8.9.1)13.85%
1.8 (1.8.9.4)13.85%
Other00.00%

GroupWise (16 servers)

Version Number of Servers Percent
24.2.0318.75%
18.3.1318.75%
18.5.0212.50%
14.2.116.25%
18.1.116.25%
14.2.316.25%
6.5.016.25%
18.4.116.25%
23.4.016.25%
14.2.216.25%
18.0.216.25%
Other00.00%

OpenVMS (6 servers)

Version Number of Servers Percent
8.4350.00%
7.3233.33%
8.2116.67%
Other00.00%

Gordano Messaging Suite (GMS) (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%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Trend Micro (2 servers)

Version Number of Servers Percent
5.182100.00%
Other00.00%

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%

InterScan VirusWall (1 servers)

Version Number of Servers Percent
Other1100.00%




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