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Mail (MX) Server Survey
November 1st, 2021

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 Queried857,797   100.0%
Number of Servers that didn't respond127,40614.85%
    Server didn't open socket125,18614.59%
    Server didn't provide banner2,2200.26%
Server provided banner730,39185.15%
Server banner identifies software in use483,81856.40%

As indicated by the above table, of the 857,797 servers queried, only 483,818 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
Exim291,49760.25%
Postfix158,99932.86%
Sendmail17,2523.57%
MailEnable9,5721.98%
MDaemon2,3910.49%
Microsoft1,2030.25%
CommuniGate Pro5860.12%
IMail4350.09%
Qmail Toaster4140.09%
XMail3480.07%
OpenSMTPD2620.05%
SurgeSMTP2460.05%
Lotus Domino1250.03%
MagicMail1040.02%
WinWebMail940.02%
Merak690.01%
Post.Office590.01%
Kerio570.01%
ArGoSoft340.01%
GroupWise300.01%
Gordano Messaging Suite (GMS)160.00%
Trend Micro70.00%
OpenVMS60.00%
VisNetic40.00%
ModusMail20.00%
Interscan10.00%
Mercury10.00%
Neon Mail Server10.00%
WebSTAR10.00%
Mirapoint10.00%
InterScan VirusWall10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (291,497 servers)

Version Number of Servers Percent
4.94.2216,62874.32%
4.9332,74611.23%
4.947,7592.66%
4.925,6751.95%
4.914,2821.47%
4.92.33,3831.16%
4.893,1571.08%
Other17,8676.13%

Postfix (158,999 servers)

Version Number of Servers Percent
Other158,999100.00%

Sendmail (17,252 servers)

Version Number of Servers Percent
8.15.29,39254.44%
8.14.42,17012.58%
8.14.71,75610.18%
8.13.81,0215.92%
8.14.59175.32%
8.16.14692.72%
8.14.93431.99%
8.13.12761.60%
8.14.31931.12%
Other7154.14%

MailEnable (9,572 servers)

Version Number of Servers Percent
10.34--3,51436.71%
10.27--9019.41%
10.25--5505.75%
9.00--2632.75%
10.31--1731.81%
10.31-10.31-1491.56%
9.16--1091.14%
10.35--1081.13%
10.29--1051.10%
9.00--9.001031.08%
10.30--981.02%
Other3,49936.55%

MDaemon (2,391 servers)

Version Number of Servers Percent
21.0.332913.76%
13.5.11606.69%
21.0.21315.48%
13.0.51034.31%
11.0.0923.85%
13.0.4883.68%
11.0.3853.55%
19.5.5833.47%
21.0.1702.93%
16.5.2612.55%
12.5.6572.38%
19.5.4522.17%
14.5.2461.92%
20.0.4391.63%
12.5.4321.34%
10.0.0291.21%
15.0.3271.13%
20.0.3271.13%
10.1.2261.09%
Other85435.72%

Microsoft (1,203 servers)

Version Number of Servers Percent
6.0.3790.467540333.50%
8.5.9600.1638419716.38%
7.5.7601.175141099.06%
10.0.14393.41691078.89%
10.0.17763.1697816.73%
6.0.3790.3959645.32%
5.0.2195.5329574.74%
8.0.9200.16384272.24%
10.0.14393.2608231.91%
5.0.2195.6713221.83%
6.0.3790.1830151.25%
10.0.17763.1141.16%
Other846.98%

CommuniGate Pro (586 servers)

Version Number of Servers Percent
6.2.158314.16%
6.2.146210.58%
6.2.12203.41%
6.1.20203.41%
5.4.11172.90%
6.0.11172.90%
6.1.16162.73%
6.3.6162.73%
6.1.18152.56%
5.2.20152.56%
6.3.5111.88%
6.0.9101.71%
6.3.391.54%
6.2.1081.37%
6.2.1681.37%
6.3.881.37%
5.1.1681.37%
4.2.1071.19%
6.1.1971.19%
6.3.461.02%
6.2.761.02%
5.2.361.02%
6.2.1361.02%
6.0.761.02%
Other19933.96%

IMail (435 servers)

Version Number of Servers Percent
12.5.8.418218.85%
12.5.7.594610.57%
12.5.6.1014510.34%
12.4.1.15388.74%
9.23245.52%
8.05204.60%
12.5.6.105194.37%
8.22194.37%
12.5.3.93173.91%
8.15173.91%
12.3.0.100173.91%
12.5.5.115143.22%
12.5.5.117102.30%
12.5.4.14692.07%
10.0292.07%
Other4911.26%

Qmail Toaster (414 servers)

Version Number of Servers Percent
1.331375.60%
1.039021.74%
1.03.561.45%
Other51.21%

XMail (348 servers)

Version Number of Servers Percent
1.2718352.59%
1.2211432.76%
1.25144.02%
1.26123.45%
1.24102.87%
1.1541.15%
Other113.16%

OpenSMTPD (262 servers)

Version Number of Servers Percent
Other262100.00%

SurgeSMTP (246 servers)

Version Number of Servers Percent
7.5c-14116.67%
7.3o4-43112.60%
7.5a-1218.54%
7.6d-1187.32%
7.4o-1156.10%
7.3e2-2156.10%
7.1e-1124.88%
7.4e-183.25%
6.5a2-262.44%
7.3i2-252.03%
6.7c-152.03%
7.2a-141.63%
6.9c-141.63%
3.9e-141.63%
Other5723.17%

Lotus Domino (125 servers)

Version Number of Servers Percent
8.5.33024.00%
8.5.3FP62116.80%
7.086.40%
7.0.364.80%
8.5.2FP254.00%
8.5.254.00%
7.0.243.20%
8.5.143.20%
8.0.132.40%
5.0.832.40%
8.5.3FP132.40%
8.5.2FP332.40%
6.5.121.60%
8.021.60%
8.5.3FP521.60%
6.521.60%
7.5.121.60%
8.5.2FP421.60%
8.5.2FP121.60%
Other1612.80%

MagicMail (104 servers)

Version Number of Servers Percent
Other104100.00%

WinWebMail (94 servers)

Version Number of Servers Percent
4.2.0.12021.28%
3.9.0.71819.15%
4.3.0.199.57%
3.8.1.366.38%
4.4.0.144.26%
3.8.6.144.26%
3.8.0.144.26%
3.7.3.144.26%
3.7.6.133.19%
4.1.0.133.19%
1.033.19%
3.7.5.122.13%
3.8.5.122.13%
3.7.0.322.13%
3.9.1.111.06%
4.0.0.111.06%
3.9.2.211.06%
3.8.1.111.06%
3.9.0.111.06%
3.8.1.511.06%
3.9.5.311.06%
3.7.6.211.06%
3.8.3.111.06%
3.8.1.611.06%
Other00.00%

Merak (69 servers)

Version Number of Servers Percent
8.0.31826.09%
8.9.11826.09%
7.6.1811.59%
8.3.845.80%
9.0.334.35%
7.4.534.35%
7.6.022.90%
8.5.022.90%
6.1.011.45%
8.3.611.45%
8.0.111.45%
8.9.211.45%
4.2.111.45%
5.8.211.45%
8.9.711.45%
7.4.411.45%
6.0.811.45%
7.0.111.45%
8.9.011.45%
Other00.00%

Post.Office (59 servers)

Version Number of Servers Percent
4.41932.20%
4.31322.03%
4.2.21118.64%
4.1.2.446.78%
3.5.335.08%
3.9.223.39%
4.2.1.123.39%
4.1.111.69%
3.5.3J11.69%
4.1.0.311.69%
4.111.69%
3.1.211.69%
Other00.00%

Kerio (57 servers)

Version Number of Servers Percent
6.7.31729.82%
6.7.0712.28%
6.6.1610.53%
6.6.258.77%
6.5.058.77%
6.5.247.02%
6.7.135.26%
6.7.235.26%
6.5.123.51%
5.7.911.75%
6.3.111.75%
6.0.811.75%
6.6.011.75%
6.4.111.75%
Other00.00%

ArGoSoft (34 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)720.59%
1.8 (1.8.9.3)617.65%
1.8 (1.8.9.5)514.71%
1.8 (1.8.8.7)25.88%
1.8 (1.8.8.8)25.88%
1.8 (1.8.9.1)25.88%
1.8 (1.8.6.1)12.94%
1.8 (1.8.7.3)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 (1.8.9.2)12.94%
1.8 (1.8.1.7)12.94%
1.8 (1.8.2.1)12.94%
1.8 (1.8.2.5)12.94%
Other00.00%

GroupWise (30 servers)

Version Number of Servers Percent
18.1.1516.67%
18.2.0413.33%
18.3.1413.33%
18.1.0310.00%
14.2.226.67%
18.2.126.67%
18.0.213.33%
14.0.013.33%
14.2.013.33%
8.0.313.33%
14.2.113.33%
6.5.713.33%
6.5.013.33%
14.2.313.33%
18.0.013.33%
7.0.213.33%
Other00.00%

Gordano Messaging Suite (GMS) (16 servers)

Version Number of Servers Percent
Other16100.00%

Trend Micro (7 servers)

Version Number of Servers Percent
5.7342.86%
5.18342.86%
7.5ready114.29%
Other00.00%

OpenVMS (6 servers)

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

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0250.00%
8.0.3125.00%
5.0.1125.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Interscan (1 servers)

Version Number of Servers Percent
3.8-Build_30131100.00%
Other00.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
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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