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Mail (MX) Server Survey
February 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 Queried765,451   100.0%
Number of Servers that didn't respond107,77614.08%
    Server didn't open socket105,73013.81%
    Server didn't provide banner2,0460.27%
Server provided banner657,67585.92%
Server banner identifies software in use439,78057.45%

As indicated by the above table, of the 765,451 servers queried, only 439,780 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
Exim268,02760.95%
Postfix142,00032.29%
Sendmail15,4943.52%
MailEnable8,7611.99%
MDaemon1,9600.45%
Microsoft9880.22%
CommuniGate Pro5020.11%
Qmail Toaster3900.09%
IMail3820.09%
XMail2990.07%
OpenSMTPD2320.05%
SurgeSMTP2240.05%
Lotus Domino980.02%
MagicMail950.02%
WinWebMail780.02%
Merak600.01%
Kerio520.01%
Post.Office430.01%
ArGoSoft340.01%
GroupWise240.01%
Gordano Messaging Suite (GMS)120.00%
Trend Micro90.00%
OpenVMS50.00%
VisNetic30.00%
ModusMail20.00%
Neon Mail Server10.00%
Interscan10.00%
WebSTAR10.00%
Mirapoint10.00%
WebSTAR V10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (268,027 servers)

Version Number of Servers Percent
4.94.2206,45677.03%
4.9319,0017.09%
4.959,2033.43%
4.945,3311.99%
4.924,7951.79%
4.913,5431.32%
4.92.32,7841.04%
4.892,6901.00%
Other14,2245.31%

Postfix (142,000 servers)

Version Number of Servers Percent
Other142,000100.00%

Sendmail (15,494 servers)

Version Number of Servers Percent
8.15.28,87257.26%
8.14.41,78811.54%
8.14.71,5389.93%
8.13.88315.36%
8.14.57594.90%
8.16.13832.47%
8.14.92691.74%
8.13.12441.57%
8.14.31591.03%
Other6514.20%

MailEnable (8,761 servers)

Version Number of Servers Percent
10.34--3,43339.19%
10.27--6307.19%
10.25--4685.34%
9.00--2322.65%
10.37--2232.55%
10.37--10.371531.75%
10.31--1361.55%
10.31-10.31-1341.53%
10.37-10.37-1311.50%
9.00--9.001031.18%
9.16--981.12%
10.29--961.10%
Other2,92433.38%

MDaemon (1,960 servers)

Version Number of Servers Percent
21.5.11869.49%
13.5.11175.97%
21.0.31125.71%
21.5.0904.59%
13.0.5854.34%
13.0.4804.08%
11.0.0743.78%
11.0.3723.67%
19.5.5693.52%
21.0.2613.11%
16.5.2492.50%
19.5.4452.30%
21.0.1412.09%
14.5.2391.99%
12.5.6371.89%
20.0.4271.38%
9.6.6251.28%
10.0.0241.22%
15.0.3211.07%
10.1.2201.02%
12.5.4201.02%
Other66633.98%

Microsoft (988 servers)

Version Number of Servers Percent
6.0.3790.467530931.28%
8.5.9600.1638415215.38%
10.0.14393.416910710.83%
10.0.17763.1697737.39%
7.5.7601.17514727.29%
5.0.2195.5329515.16%
6.0.3790.3959515.16%
8.0.9200.16384282.83%
5.0.2195.6713222.23%
10.0.14393.2608171.72%
6.0.3790.1830131.32%
10.0.17763.1121.21%
7.0.6002.18264111.11%
10.0.14393.0101.01%
Other606.07%

CommuniGate Pro (502 servers)

Version Number of Servers Percent
6.2.156212.35%
6.2.14469.16%
6.1.20214.18%
6.2.12183.59%
6.0.11142.79%
5.4.11132.59%
6.1.18132.59%
6.2.16132.59%
6.1.16122.39%
6.3.6101.99%
5.1.1691.79%
5.2.2091.79%
6.0.981.59%
6.3.981.59%
6.3.581.59%
7.1.181.59%
6.3.771.39%
6.2.1071.39%
6.3.471.39%
5.1.761.20%
5.2.1361.20%
Other19739.24%

Qmail Toaster (390 servers)

Version Number of Servers Percent
1.330578.21%
1.037619.49%
1.03.551.28%
Other41.03%

IMail (382 servers)

Version Number of Servers Percent
12.5.8.416918.06%
12.5.6.1014511.78%
12.5.7.59359.16%
9.23225.76%
12.4.1.15225.76%
8.22215.50%
8.05184.71%
12.5.6.105164.19%
12.5.3.93153.93%
12.3.0.100133.40%
12.5.5.115123.14%
8.15112.88%
12.5.5.11782.09%
10.0271.83%
12.5.4.14671.83%
12.5.8.5461.57%
11.561.57%
9.2041.05%
7.0741.05%
Other4110.73%

XMail (299 servers)

Version Number of Servers Percent
1.2715250.84%
1.2210133.78%
1.26155.02%
1.25113.68%
1.2451.67%
1.1551.67%
Other103.34%

OpenSMTPD (232 servers)

Version Number of Servers Percent
Other232100.00%

SurgeSMTP (224 servers)

Version Number of Servers Percent
7.3o4-42912.95%
7.5c-12310.27%
7.6h-2229.82%
7.5a-1156.70%
7.4o-1146.25%
7.3e2-2146.25%
7.6d-1135.80%
7.1e-1114.91%
6.7c-173.12%
7.4e-173.12%
7.3i2-262.68%
6.5a2-252.23%
3.9e-141.79%
7.2a-141.79%
6.9c-131.34%
7.6h-131.34%
Other4419.64%

Lotus Domino (98 servers)

Version Number of Servers Percent
8.5.31818.37%
8.5.3FP61414.29%
7.066.12%
8.5.2FP266.12%
7.0.255.10%
8.5.155.10%
7.0.344.08%
8.0.122.04%
7.0.3FP122.04%
8.5.2FP322.04%
5.0.822.04%
8.5.222.04%
7.5.122.04%
6.5.322.04%
7.0.4FP222.04%
8.5.1FP422.04%
8.5.3FP422.04%
8.522.04%
8.5.3FP122.04%
8.5.2FP122.04%
5.0.1111.02%
7.0.4FP111.02%
8.5.3FP211.02%
6.5.211.02%
8.011.02%
5.0.13a11.02%
8.5.2FP411.02%
6.511.02%
8.5.1FP511.02%
6.5.6FP311.02%
8.5.3FP311.02%
6.5.411.02%
8.5.3FP6HF121511.02%
7.0.411.02%
Other00.00%

MagicMail (95 servers)

Version Number of Servers Percent
Other95100.00%

WinWebMail (78 servers)

Version Number of Servers Percent
4.2.0.11417.95%
3.9.0.71316.67%
4.4.0.11012.82%
4.3.0.178.97%
3.8.6.156.41%
3.8.1.345.13%
3.7.3.133.85%
3.8.5.133.85%
4.0.0.133.85%
1.022.56%
4.1.0.122.56%
3.7.5.122.56%
3.8.0.122.56%
3.7.6.122.56%
3.8.1.522.56%
3.8.1.111.28%
3.7.6.211.28%
3.9.0.111.28%
3.9.2.211.28%
Other00.00%

Merak (60 servers)

Version Number of Servers Percent
8.0.31830.00%
8.9.11423.33%
7.6.1711.67%
9.0.335.00%
7.4.535.00%
8.5.035.00%
8.3.823.33%
4.4.211.67%
6.1.011.67%
8.9.211.67%
5.8.211.67%
8.9.711.67%
7.6.411.67%
7.6.011.67%
6.0.811.67%
8.9.011.67%
6.0.311.67%
Other00.00%

Kerio (52 servers)

Version Number of Servers Percent
6.7.3917.31%
6.6.2917.31%
6.6.1611.54%
6.5.0611.54%
6.7.059.62%
6.5.259.62%
6.3.023.85%
6.7.123.85%
6.6.011.92%
6.5.111.92%
6.4.111.92%
6.0.1011.92%
6.0.811.92%
6.3.111.92%
5.7.911.92%
6.7.211.92%
Other00.00%

Post.Office (43 servers)

Version Number of Servers Percent
4.41125.58%
4.2.2920.93%
4.3716.28%
3.5.336.98%
4.1.2.436.98%
3.9.224.65%
4.2.1.124.65%
4.212.33%
4.1.112.33%
3.5.3J12.33%
4.1.0.312.33%
4.112.33%
3.1.212.33%
Other00.00%

ArGoSoft (34 servers)

Version Number of Servers Percent
1.8 (1.8.9.5)514.71%
1.8 (1.8.9.3)514.71%
1.8 (1.8.9.6)514.71%
1.8 (1.8.8.8)38.82%
1.8 (1.8.9.1)38.82%
1.8 (1.8.7.3)25.88%
1.8 (1.8.8.7)25.88%
1.8 (1.8.9.2)25.88%
1.8 (1.8.6.1)12.94%
1.8 (1.8.8.9)12.94%
1.8 (1.8.5.8)12.94%
1.8 (1.8.8.4)12.94%
1.8 (1.8.9.4)12.94%
1.8 (1.8.2.1)12.94%
1.8 (1.8.2.5)12.94%
Other00.00%

GroupWise (24 servers)

Version Number of Servers Percent
18.3.1729.17%
18.2.0312.50%
18.1.128.33%
14.2.128.33%
18.2.128.33%
18.0.014.17%
6.5.014.17%
8.0.314.17%
7.0.114.17%
14.2.014.17%
14.2.214.17%
14.0.014.17%
18.0.214.17%
Other00.00%

Gordano Messaging Suite (GMS) (12 servers)

Version Number of Servers Percent
Other12100.00%

Trend Micro (9 servers)

Version Number of Servers Percent
5.18444.44%
5.7333.33%
7.5ready111.11%
7.1111.11%
Other00.00%

OpenVMS (5 servers)

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

VisNetic (3 servers)

Version Number of Servers Percent
8.0.3133.33%
5.0.1133.33%
9.3.2.0133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%

Interscan (1 servers)

Version Number of Servers Percent
3.8-Build_30131100.00%
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%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.3.21100.00%
Other00.00%

InterScan VirusWall (1 servers)

Version Number of Servers Percent
Other1100.00%




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