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Mail (MX) Server Survey
July 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 Queried1,717,171   100.0%
Number of Servers that didn't respond310,11218.06%
    Server didn't open socket302,21417.60%
    Server didn't provide banner7,8980.46%
Server provided banner1,407,05981.94%
Server banner identifies software in use875,31350.97%

As indicated by the above table, of the 1,717,171 servers queried, only 875,313 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
Exim499,88557.11%
Postfix302,66334.58%
Sendmail34,8003.98%
MailEnable18,6982.14%
MDaemon7,5250.86%
Microsoft4,8500.55%
IMail1,3690.16%
CommuniGate Pro1,2610.14%
XMail7940.09%
Qmail Toaster5840.07%
Lotus Domino5130.06%
WinWebMail4920.06%
SurgeSMTP4830.06%
OpenSMTPD3550.04%
Kerio2600.03%
Merak1710.02%
MagicMail1590.02%
Post.Office1180.01%
ArGoSoft1140.01%
GroupWise620.01%
Gordano Messaging Suite (GMS)480.01%
Trend Micro470.01%
InterScan VirusWall160.00%
VisNetic130.00%
OpenVMS100.00%
Mercury60.00%
WebSTAR V50.00%
Interscan30.00%
Mirapoint30.00%
MessageWall20.00%
Neon Mail Server20.00%
ModusMail10.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (499,885 servers)

Version Number of Servers Percent
4.92341,47368.31%
4.9180,43116.09%
4.8718,9353.79%
4.8913,9532.79%
4.8410,1642.03%
4.907,3401.47%
Other27,5895.52%

Postfix (302,663 servers)

Version Number of Servers Percent
Other302,663100.00%

Sendmail (34,800 servers)

Version Number of Servers Percent
8.15.211,94334.32%
8.14.46,78719.50%
8.13.83,65810.51%
8.14.72,8248.11%
8.14.52,7928.02%
8.13.12,4086.92%
8.14.91,4514.17%
8.14.37182.06%
Other2,2196.38%

MailEnable (18,698 servers)

Version Number of Servers Percent
10.12--4,57324.46%
9.00--1,3637.29%
9.16--1,1506.15%
8.60--4522.42%
10.20--4082.18%
6.5--3431.83%
8.53--3411.82%
8.60-8.60-2851.52%
8.51--2821.51%
10.23--2791.49%
10.24--10.242641.41%
10.24--2251.20%
10.16--2231.19%
10.18--2151.15%
1.986--2071.11%
8.04--2051.10%
10.24-10.24-2021.08%
9.00--9.001951.04%
10.19--1941.04%
Other7,29239.00%

MDaemon (7,525 servers)

Version Number of Servers Percent
19.0.16849.09%
13.5.14826.41%
13.6.33955.25%
13.0.43154.19%
13.0.52953.92%
11.0.02923.88%
11.0.32833.76%
16.5.22423.22%
18.5.32413.20%
19.0.02042.71%
18.5.21922.55%
18.5.11782.37%
12.5.41692.25%
12.5.61582.10%
14.5.21532.03%
15.0.31111.48%
16.0.41051.40%
10.1.21041.38%
18.0.21041.38%
10.0.0931.24%
16.5.1781.04%
Other2,64735.18%

Microsoft (4,850 servers)

Version Number of Servers Percent
6.0.3790.46752,26646.72%
8.5.9600.1638464413.28%
7.5.7601.1751461712.72%
6.0.3790.39592855.88%
10.0.14393.26082164.45%
8.0.9200.163841452.99%
5.0.2195.53291222.52%
7.0.6002.18264821.69%
6.0.3790.1830801.65%
5.0.2195.6713591.22%
10.0.14393.0491.01%
Other2855.88%

IMail (1,369 servers)

Version Number of Servers Percent
12.5.6.10121015.34%
12.4.1.151198.69%
8.221178.55%
12.5.7.59936.79%
12.5.5.115886.43%
12.5.3.93846.14%
9.23836.06%
12.3.0.100664.82%
8.15604.38%
12.5.4.146503.65%
12.5.7.58443.21%
11.03392.85%
8.05392.85%
10.02211.53%
12.5.5.117211.53%
11.5181.31%
7.15161.17%
Other20114.68%

CommuniGate Pro (1,261 servers)

Version Number of Servers Percent
6.2.12695.47%
6.2.12.574.52%
6.1.16.352.78%
5.3.13.322.54%
5.4.11.241.90%
5.4.11231.82%
6.0.11231.82%
6.0.11.231.82%
6.1.16221.74%
5.2.20.221.74%
6.1.18211.67%
6.2.10201.59%
5.1.16191.51%
6.1.20171.35%
6.1.2.171.35%
6.0.9161.27%
6.1.18.161.27%
6.2.10.161.27%
6.2.11161.27%
6.2.7151.19%
5.2.20151.19%
6.1.10151.19%
6.1.20.131.03%
Other71556.70%

XMail (794 servers)

Version Number of Servers Percent
1.2738348.24%
1.2225832.49%
1.26465.79%
1.25455.67%
1.24283.53%
1.2181.01%
Other263.27%

Qmail Toaster (584 servers)

Version Number of Servers Percent
1.344476.03%
1.0312321.06%
1.03.581.37%
Other91.54%

Lotus Domino (513 servers)

Version Number of Servers Percent
8.5.3FP610821.05%
8.5.37915.40%
8.5.2244.68%
7.0.2214.09%
8.5193.70%
8.5.1163.12%
8.5.3FP1132.53%
7.0122.34%
8.5.2FP2122.34%
8.5.3FP2112.14%
7.0.3112.14%
8.5.3FP4112.14%
8.5.3FP3112.14%
8.0.1101.95%
8.0101.95%
8.5.2FP481.56%
8.5.1FP571.36%
8.5.2FP371.36%
8.5.3FP561.17%
6.5.461.17%
8.5.2FP4HF75961.17%
8.0.261.17%
7.0.3FP161.17%
Other9318.13%

WinWebMail (492 servers)

Version Number of Servers Percent
4.2.0.18116.46%
3.9.0.77715.65%
3.8.1.35110.37%
3.9.0.1326.50%
3.8.0.1295.89%
3.7.6.1255.08%
4.1.0.1214.27%
3.8.1.5183.66%
4.0.0.1163.25%
3.7.3.1153.05%
3.8.5.1122.44%
3.7.7.3112.24%
3.9.2.1112.24%
3.8.3.1102.03%
3.8.2.1102.03%
3.8.6.1102.03%
3.8.1.1102.03%
3.9.3.181.63%
3.9.5.381.63%
3.7.0.551.02%
1.051.02%
Other275.49%

SurgeSMTP (483 servers)

Version Number of Servers Percent
7.3o4-413127.12%
7.3e2-26914.29%
7.3i2-2326.63%
7.1e-1316.42%
6.5a2-2244.97%
6.7c-1183.73%
7.2a-1153.11%
7.2i-1142.90%
7.0c2-2142.90%
7.3o2-2112.28%
6.9c-1102.07%
3.9e-1102.07%
7.2e-281.66%
6.5a-171.45%
6.4a-171.45%
5.2a-161.24%
6.1c-151.04%
4.0u4-451.04%
Other6613.66%

OpenSMTPD (355 servers)

Version Number of Servers Percent
Other355100.00%

Kerio (260 servers)

Version Number of Servers Percent
6.7.36223.85%
6.7.03613.85%
6.5.2249.23%
6.7.2249.23%
6.6.2238.85%
6.4.1114.23%
6.6.1114.23%
6.5.0114.23%
6.3.193.46%
6.7.183.08%
6.4.062.31%
6.6.062.31%
6.5.151.92%
6.3.041.54%
6.1.331.15%
5.7.931.15%
6.1.031.15%
Other114.23%

Merak (171 servers)

Version Number of Servers Percent
8.0.34123.98%
8.9.13822.22%
8.5.0127.02%
7.6.1116.43%
7.4.595.26%
8.3.895.26%
9.0.374.09%
7.5.263.51%
7.6.442.34%
7.6.031.75%
7.2.031.75%
7.0.131.75%
6.0.831.75%
4.4.121.17%
7.4.221.17%
Other1810.53%

MagicMail (159 servers)

Version Number of Servers Percent
Other159100.00%

Post.Office (118 servers)

Version Number of Servers Percent
4.32924.58%
4.2.22218.64%
4.41512.71%
4.1.2.41311.02%
3.5.397.63%
4.2.1.332.54%
3.5.132.54%
3.9.221.69%
4.1.121.69%
3.5.3J21.69%
4.2.1.121.69%
3.8.7.421.69%
3.9.2.321.69%
Other1210.17%

ArGoSoft (114 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)4135.96%
1.8 (1.8.9.3)1815.79%
1.8 (1.8.9.5)1513.16%
1.8 (1.8.9.1)108.77%
1.8 (1.8.8.8)32.63%
1.8 (1.8.7.3)32.63%
1.8 (1.8.7.6)32.63%
1.8 (1.8.9.2)32.63%
1.8 (1.8.8.9)21.75%
1.8 (1.8.8.7)21.75%
1.8 (1.8.5.8)21.75%
1.8 (1.8.6.0)21.75%
1.8 (1.8.2.1)21.75%
Other87.02%

GroupWise (62 servers)

Version Number of Servers Percent
14.2.21016.13%
18.0.2914.52%
18.1.0914.52%
14.2.369.68%
14.2.046.45%
18.1.146.45%
14.2.146.45%
6.5.734.84%
7.0.323.23%
14.0.123.23%
18.0.123.23%
7.0.411.61%
6.5.011.61%
12.0.111.61%
7.0.111.61%
6.5.611.61%
8.0.311.61%
6.0.411.61%
Other00.00%

Gordano Messaging Suite (GMS) (48 servers)

Version Number of Servers Percent
Other48100.00%

Trend Micro (47 servers)

Version Number of Servers Percent
5.71429.79%
5.181225.53%
5.5714.89%
7.5510.64%
7.048.51%
8.512.13%
7.5ready12.13%
812.13%
9.012.13%
7.112.13%
Other00.00%

InterScan VirusWall (16 servers)

Version Number of Servers Percent
Other16100.00%

VisNetic (13 servers)

Version Number of Servers Percent
9.3.2.0861.54%
8.0.317.69%
5.0.2.317.69%
9.1.4.017.69%
5.5.8.317.69%
6.2.2.017.69%
Other00.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4440.00%
7.3440.00%
8.3110.00%
8.2110.00%
Other00.00%

Mercury (6 servers)

Version Number of Servers Percent
3.32350.00%
1.48350.00%
Other00.00%

WebSTAR V (5 servers)

Version Number of Servers Percent
5.4.1480.00%
5.3.2120.00%
Other00.00%

Interscan (3 servers)

Version Number of Servers Percent
3.81-Build_1022266.67%
3.8-Build_3013133.33%
Other00.00%

Mirapoint (3 servers)

Version Number of Servers Percent
3.10.10a-GA133.33%
4.3.5-GA133.33%
4.4.6-GA133.33%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

Neon Mail Server (2 servers)

Version Number of Servers Percent
3.1.0150.00%
3.1.2150.00%
Other00.00%

ModusMail (1 servers)

Version Number of Servers Percent
4.1.361.211100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%




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