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Mail (MX) Server Survey
December 1st, 2019

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 Queried1,714,940   100.0%
Number of Servers that didn't respond312,91618.25%
    Server didn't open socket307,52317.93%
    Server didn't provide banner5,3930.31%
Server provided banner1,402,02481.75%
Server banner identifies software in use870,24850.75%

As indicated by the above table, of the 1,714,940 servers queried, only 870,248 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
Exim495,14956.90%
Postfix304,38134.98%
Sendmail33,9223.90%
MailEnable18,4602.12%
MDaemon7,0750.81%
Microsoft4,4190.51%
IMail1,2850.15%
CommuniGate Pro1,2290.14%
XMail7750.09%
Qmail Toaster7140.08%
SurgeSMTP5140.06%
Lotus Domino4930.06%
WinWebMail4480.05%
OpenSMTPD3720.04%
Kerio2350.03%
MagicMail1720.02%
Merak1440.02%
Post.Office1300.01%
ArGoSoft1000.01%
GroupWise710.01%
Gordano Messaging Suite (GMS)670.01%
Trend Micro410.00%
OpenVMS140.00%
VisNetic100.00%
InterScan VirusWall100.00%
Interscan40.00%
Mercury30.00%
WebSTAR V30.00%
ModusMail20.00%
MessageWall20.00%
Mirapoint20.00%
WebSTAR10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (495,149 servers)

Version Number of Servers Percent
4.92365,28673.77%
4.9140,7338.23%
4.92.323,4364.73%
4.8711,5902.34%
4.899,3911.90%
4.92.27,8551.59%
4.847,7251.56%
4.905,3171.07%
Other23,8164.81%

Postfix (304,381 servers)

Version Number of Servers Percent
Other304,381100.00%

Sendmail (33,922 servers)

Version Number of Servers Percent
8.15.212,94138.15%
8.14.46,41418.91%
8.13.83,2859.68%
8.14.72,8778.48%
8.14.52,5857.62%
8.13.12,1226.26%
8.14.99672.85%
8.14.36581.94%
Other2,0736.11%

MailEnable (18,460 servers)

Version Number of Servers Percent
10.25--6,32234.25%
9.00--1,0475.67%
10.27--5793.14%
10.12--5022.72%
9.16--3661.98%
8.60--3451.87%
8.53--2571.39%
10.20--2551.38%
6.5--2521.37%
8.60-8.60-2401.30%
10.26--2311.25%
8.51--2071.12%
10.25--10.252051.11%
10.25-10.25-2011.09%
9.00--9.001931.05%
Other7,25839.32%

MDaemon (7,075 servers)

Version Number of Servers Percent
19.0.34716.66%
13.5.14496.35%
19.5.04215.95%
13.6.33935.55%
13.0.43074.34%
13.0.52763.90%
19.5.12703.82%
11.0.32603.67%
11.0.02523.56%
16.5.22193.10%
12.5.41552.19%
12.5.61512.13%
14.5.21422.01%
18.5.31081.53%
10.0.0971.37%
18.5.1941.33%
10.1.2911.29%
16.0.4881.24%
15.0.3861.22%
18.5.2841.19%
10.1.0741.05%
18.0.2741.05%
19.0.2731.03%
Other2,44034.49%

Microsoft (4,419 servers)

Version Number of Servers Percent
6.0.3790.46751,97844.76%
8.5.9600.1638461813.99%
7.5.7601.1751453912.20%
6.0.3790.39592575.82%
10.0.14393.26082505.66%
5.0.2195.53291302.94%
8.0.9200.163841262.85%
6.0.3790.1830741.67%
7.0.6002.18264721.63%
5.0.2195.6713581.31%
Other3177.17%

IMail (1,285 servers)

Version Number of Servers Percent
12.5.6.10118814.63%
12.5.7.5917813.85%
12.4.1.151229.49%
9.23775.99%
12.5.3.93735.68%
8.22655.06%
12.5.5.115644.98%
12.3.0.100594.59%
8.15483.74%
8.05413.19%
12.5.4.146382.96%
12.5.7.58332.57%
11.03312.41%
10.02221.71%
12.5.6.105201.56%
12.5.5.117191.48%
11.5181.40%
7.15161.25%
10.01141.09%
Other15912.37%

CommuniGate Pro (1,229 servers)

Version Number of Servers Percent
6.2.14967.81%
6.2.12746.02%
6.1.16483.91%
6.0.11473.82%
5.4.11413.34%
6.2.13393.17%
5.2.20383.09%
5.3.13352.85%
6.1.20342.77%
6.1.18292.36%
6.2.10282.28%
5.1.16272.20%
6.0.9241.95%
6.1.11231.87%
6.2.7211.71%
5.2.3191.55%
6.1.10181.46%
6.1.12171.38%
6.2.9171.38%
6.2.1161.30%
6.1.2151.22%
6.1.9141.14%
4.2.10141.14%
6.1.13141.14%
6.2.4141.14%
4.1.8131.06%
Other45436.94%

XMail (775 servers)

Version Number of Servers Percent
1.2738249.29%
1.2224531.61%
1.26455.81%
1.25415.29%
1.24273.48%
Other354.52%

Qmail Toaster (714 servers)

Version Number of Servers Percent
1.354175.77%
1.0315021.01%
1.03.5101.40%
Other131.82%

SurgeSMTP (514 servers)

Version Number of Servers Percent
7.3o4-416031.13%
7.3e2-25911.48%
7.1e-1316.03%
7.3i2-2244.67%
6.5a2-2234.47%
7.4a-1193.70%
7.2i-1173.31%
6.7c-1163.11%
7.2a-1163.11%
7.0c2-2122.33%
3.9e-1112.14%
6.9c-1101.95%
7.2e-281.56%
6.5a-181.56%
4.0u4-471.36%
Other9318.09%

Lotus Domino (493 servers)

Version Number of Servers Percent
8.5.3FP610521.30%
8.5.36312.78%
8.5.2275.48%
8.5193.85%
7.0.2193.85%
8.5.1173.45%
7.0122.43%
8.5.3FP2112.23%
8.5.3FP1112.23%
8.5.3FP3112.23%
8.5.2FP2112.23%
8.0.1102.03%
8.5.3FP4102.03%
8.5.2FP3102.03%
8.5.2FP491.83%
7.0.391.83%
8.081.62%
8.5.3FP571.42%
6.5.561.22%
6.5.461.22%
8.5.2FP4HF75961.22%
8.5.1FP561.22%
6.5.351.01%
7.0.151.01%
8.5.1FP451.01%
8.0.251.01%
7.0.4FP251.01%
7.0.3FP151.01%
Other7014.20%

WinWebMail (448 servers)

Version Number of Servers Percent
4.2.0.17717.19%
3.9.0.77216.07%
3.8.1.35111.38%
3.9.0.1357.81%
3.8.0.1255.58%
3.7.6.1173.79%
3.8.1.5173.79%
4.1.0.1173.79%
4.0.0.1163.57%
3.8.1.1122.68%
3.8.5.1112.46%
3.7.3.1102.23%
3.8.3.192.01%
3.9.2.192.01%
3.9.3.181.79%
3.7.7.371.56%
3.9.5.371.56%
3.8.2.171.56%
3.7.1.161.34%
3.8.6.161.34%
1.051.12%
Other245.36%

OpenSMTPD (372 servers)

Version Number of Servers Percent
Other372100.00%

Kerio (235 servers)

Version Number of Servers Percent
6.7.35724.26%
6.7.03012.77%
6.7.22410.21%
6.5.2218.94%
6.6.2208.51%
6.5.0125.11%
6.6.1114.68%
6.4.1104.26%
6.7.193.83%
6.1.052.13%
6.3.152.13%
6.4.052.13%
6.6.041.70%
6.1.331.28%
6.3.031.28%
6.5.131.28%
Other135.53%

MagicMail (172 servers)

Version Number of Servers Percent
Other172100.00%

Merak (144 servers)

Version Number of Servers Percent
8.0.33423.61%
8.9.13121.53%
7.6.1106.94%
7.4.596.25%
8.5.096.25%
9.0.374.86%
8.3.874.86%
7.5.242.78%
6.0.832.08%
7.0.132.08%
7.6.032.08%
7.6.432.08%
4.4.121.39%
7.4.221.39%
Other1711.81%

Post.Office (130 servers)

Version Number of Servers Percent
4.33224.62%
4.2.22620.00%
4.41713.08%
4.1.2.41310.00%
3.5.396.92%
4.2.1.353.85%
3.5.132.31%
3.5.3J32.31%
4.1.132.31%
4.0.121.54%
4.2.1.121.54%
3.9.221.54%
3.8.7.421.54%
Other118.46%

ArGoSoft (100 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)3232.00%
1.8 (1.8.9.3)1717.00%
1.8 (1.8.9.5)1515.00%
1.8 (1.8.9.1)66.00%
1.8 (1.8.8.8)33.00%
1.8 (1.8.7.6)33.00%
1.8 (1.8.2.1)22.00%
1.8 (1.8.6.0)22.00%
1.8 (1.8.9.2)22.00%
1.8 (1.8.5.8)22.00%
1.8 (1.8.8.7)22.00%
1.8 (1.8.8.4)22.00%
1.8 (1.8.8.9)22.00%
1.8 (1.8.7.3)22.00%
1.8 (1.8.5.5)11.00%
1.8 (1.8.9.0)11.00%
1.8 (1.8.9.4)11.00%
1.8 (1.8.3.5)11.00%
1.8 (1.8.1.1)11.00%
1.8 (1.8.6.1)11.00%
1.8 (1.8.1.7)11.00%
1.8 (1.8.2.5)11.00%
Other00.00%

GroupWise (71 servers)

Version Number of Servers Percent
18.1.11216.90%
18.1.0912.68%
14.2.2811.27%
14.2.379.86%
18.0.257.04%
14.2.157.04%
14.2.045.63%
8.0.334.23%
14.0.122.82%
18.0.022.82%
14.0.022.82%
6.5.722.82%
6.5.011.41%
6.5.511.41%
12.0.111.41%
7.0.111.41%
18.0.111.41%
6.5.611.41%
6.5.411.41%
7.0.311.41%
7.0.211.41%
6.0.211.41%
Other00.00%

Gordano Messaging Suite (GMS) (67 servers)

Version Number of Servers Percent
Other67100.00%

Trend Micro (41 servers)

Version Number of Servers Percent
5.71126.83%
5.181126.83%
5.5512.20%
7.0512.20%
7.549.76%
7.124.88%
7.5ready12.44%
812.44%
9.012.44%
Other00.00%

OpenVMS (14 servers)

Version Number of Servers Percent
8.4750.00%
7.3428.57%
8.3214.29%
8.217.14%
Other00.00%

VisNetic (10 servers)

Version Number of Servers Percent
9.3.2.0770.00%
8.0.3110.00%
9.1.4.0110.00%
5.5.8.3110.00%
Other00.00%

InterScan VirusWall (10 servers)

Version Number of Servers Percent
Other10100.00%

Interscan (4 servers)

Version Number of Servers Percent
3.81-Build_1022250.00%
3.8-Build_3013125.00%
3.8-Build_1080125.00%
Other00.00%

Mercury (3 servers)

Version Number of Servers Percent
1.48266.67%
3.32133.33%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.13100.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

Mirapoint (2 servers)

Version Number of Servers Percent
4.4.5-GA150.00%
4.4.6-GA150.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%




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