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Mail (MX) Server Survey
December 1st, 2017

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 Queried2,007,645   100.0%
Number of Servers that didn't respond371,21718.49%
    Server didn't open socket361,66718.01%
    Server didn't provide banner9,5500.48%
Server provided banner1,636,42881.51%
Server banner identifies software in use1,008,86950.25%

As indicated by the above table, of the 2,007,645 servers queried, only 1,008,869 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
Exim570,61656.56%
Postfix340,90233.79%
Sendmail46,3024.59%
MailEnable22,6752.25%
MDaemon10,8601.08%
Microsoft8,6010.85%
IMail1,9950.20%
CommuniGate Pro1,7410.17%
XMail1,0030.10%
Lotus Domino9050.09%
WinWebMail8960.09%
SurgeSMTP5870.06%
Qmail Toaster4610.05%
Kerio4120.04%
Merak2560.03%
ArGoSoft1840.02%
Post.Office1500.01%
Gordano Messaging Suite (GMS)790.01%
GroupWise780.01%
Trend Micro620.01%
InterScan VirusWall270.00%
VisNetic230.00%
Mirapoint140.00%
OpenVMS100.00%
Mercury80.00%
WebSTAR V60.00%
Interscan60.00%
MessageWall40.00%
Neon Mail Server40.00%
ModusMail10.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (570,616 servers)

Version Number of Servers Percent
4.89341,88659.92%
4.87130,97022.95%
4.8821,4443.76%
4.8419,0663.34%
4.808,1531.43%
4.867,2571.27%
4.857,1921.26%
4.726,5551.15%
4.766,1841.08%
Other21,9093.84%

Postfix (340,902 servers)

Version Number of Servers Percent
Other340,902100.00%

Sendmail (46,302 servers)

Version Number of Servers Percent
8.14.512,12826.19%
8.14.410,56322.81%
8.13.87,10915.35%
8.13.14,2969.28%
8.15.23,0436.57%
8.14.32,0714.47%
8.14.71,9824.28%
8.14.91,3252.86%
Other3,7858.17%

MailEnable (22,675 servers)

Version Number of Servers Percent
9.00--3,06413.51%
9.16--1,7547.74%
8.60--1,0844.78%
8.53--9614.24%
6.5--8073.56%
8.51--6592.91%
1.986--5092.24%
8.04--4722.08%
9.75--4662.06%
8.60-8.60-4101.81%
8.50--3201.41%
5.10--2911.28%
9.74--2841.25%
9.53--2781.23%
8.00--2761.22%
Other11,04048.69%

MDaemon (10,860 servers)

Version Number of Servers Percent
17.5.17647.03%
16.5.26816.27%
13.5.15825.36%
13.6.34944.55%
17.0.24564.20%
11.0.04534.17%
13.0.44404.05%
11.0.34364.01%
13.0.54153.82%
17.5.03333.07%
16.0.43273.01%
12.5.62362.17%
17.0.32252.07%
12.5.42202.03%
16.5.12182.01%
15.0.32001.84%
14.5.21911.76%
10.0.01681.55%
10.1.21541.42%
16.0.11391.28%
17.0.01321.22%
15.5.31271.17%
10.1.11221.12%
13.0.21131.04%
Other3,23429.78%

Microsoft (8,601 servers)

Version Number of Servers Percent
6.0.3790.46755,01058.25%
7.5.7601.175141,07512.50%
8.5.9600.163847678.92%
6.0.3790.39595716.64%
8.0.9200.163841952.27%
5.0.2195.53291621.88%
7.0.6002.182641561.81%
6.0.3790.18301421.65%
5.0.2195.7381871.01%
Other4365.07%

IMail (1,995 servers)

Version Number of Servers Percent
12.5.5.11528014.04%
12.4.1.151758.77%
8.221497.47%
12.5.3.931467.32%
12.5.6.1011407.02%
9.231326.62%
12.5.4.1461296.47%
12.3.0.100944.71%
8.15924.61%
8.05653.26%
11.03572.86%
11.5492.46%
12.5.5.117331.65%
12.5.1.60281.40%
7.15271.35%
7.07261.30%
10.02251.25%
10.01211.05%
11.02211.05%
Other30615.34%

CommuniGate Pro (1,741 servers)

Version Number of Servers Percent
5.1.161257.18%
6.1.16.724.14%
6.1.16653.73%
6.1.18573.27%
6.1.18.563.22%
6.2452.58%
6.1.11362.07%
6.1.10341.95%
5.3.13.331.90%
6.0.11.331.90%
5.2.20331.90%
5.4.11321.84%
5.4.11.311.78%
6.1.2.271.55%
6.1.17261.49%
6.1.15.251.44%
5.2.20.251.44%
6.0.11251.44%
6.1.11.231.32%
5.1.16.231.32%
6.0.9.221.26%
6.0.9211.21%
5.2.3201.15%
6.1.13201.15%
6.1.14191.09%
5.0.14.181.03%
6.1.17.181.03%
Other77744.63%

XMail (1,003 servers)

Version Number of Servers Percent
1.2743943.77%
1.2232732.60%
1.25686.78%
1.26676.68%
1.24393.89%
1.21181.79%
1.23121.20%
Other333.29%

Lotus Domino (905 servers)

Version Number of Servers Percent
8.5.3FP617719.56%
8.5.312013.26%
8.5.2424.64%
7.0.2374.09%
8.5.1343.76%
8.5323.54%
8.5.3FP2242.65%
8.5.3FP4232.54%
8.5.3FP1232.54%
7.0.3222.43%
8.5.2FP4212.32%
8.5.3FP3202.21%
8.5.2FP3192.10%
8.5.2FP2181.99%
8.5.3FP5171.88%
8.0161.77%
7.0141.55%
8.0.1141.55%
6.5.1131.44%
7.0.4131.44%
7.0.1111.22%
8.5.1FP5111.22%
6.5101.10%
7.0.3FP1101.10%
Other16418.12%

WinWebMail (896 servers)

Version Number of Servers Percent
3.9.0.720022.32%
3.8.1.312814.29%
3.9.0.1687.59%
3.8.0.1576.36%
3.7.6.1515.69%
3.8.1.5414.58%
3.8.1.1323.57%
3.9.5.1303.35%
3.7.3.1293.24%
3.8.5.1293.24%
3.7.7.3252.79%
3.9.2.1252.79%
3.8.6.1252.79%
3.9.3.1232.57%
3.8.2.1171.90%
3.9.5.3161.79%
3.8.3.1161.79%
3.7.1.1151.67%
3.7.0.5101.12%
3.8.3.3101.12%
Other495.47%

SurgeSMTP (587 servers)

Version Number of Servers Percent
7.1e-17412.61%
7.3e2-26811.58%
7.2i-16110.39%
7.3c3-3589.88%
6.5a2-2366.13%
7.2a-1355.96%
6.7c-1264.43%
7.2e-2264.43%
6.5a-1193.24%
6.9c-1183.07%
7.0c2-2172.90%
3.9e-1142.39%
5.2a-1132.21%
6.1c-1122.04%
7.3d-5111.87%
4.0u4-491.53%
6.4a-181.36%
3.8k4-461.02%
Other7612.95%

Qmail Toaster (461 servers)

Version Number of Servers Percent
1.336078.09%
1.037616.49%
1.2102.17%
1.03.571.52%
Other81.74%

Kerio (412 servers)

Version Number of Servers Percent
6.7.38821.36%
6.7.05212.62%
6.5.2389.22%
6.6.2389.22%
6.7.2307.28%
6.5.0225.34%
6.6.1184.37%
6.4.1174.13%
6.7.1174.13%
6.3.1143.40%
6.3.0112.67%
6.5.1102.43%
6.4.092.18%
6.1.381.94%
6.6.071.70%
6.4.251.21%
Other286.80%

Merak (256 servers)

Version Number of Servers Percent
8.0.37428.91%
8.9.14417.19%
8.5.0207.81%
7.5.2166.25%
8.3.8135.08%
7.4.5135.08%
7.6.1124.69%
7.6.493.52%
9.0.341.56%
7.2.041.56%
7.4.231.17%
4.4.131.17%
6.0.831.17%
4.2.131.17%
6.1.031.17%
7.6.031.17%
7.0.131.17%
5.9.431.17%
4.4.231.17%
Other207.81%

ArGoSoft (184 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)6836.96%
1.8 (1.8.9.5)2211.96%
1.8 (1.8.9.3)1910.33%
1.8 (1.8.9.1)189.78%
1.8 (1.8.7.3)63.26%
1.8 (1.8.8.7)63.26%
1.8 (1.8.8.8)52.72%
1.8 (1.8.9.2)42.17%
1.8 (1.8.6.0)42.17%
1.8 (1.8.8.9)42.17%
1.8 (1.8.9.4)31.63%
1.8 (1.8.7.6)21.09%
1.8 (1.8.2.1)21.09%
1.8 (1.8.6.1a21.09%
1.8 (1.8.5.8)21.09%
1.8 (1.8.8.4)21.09%
1.8 (1.8.5.9)21.09%
Other137.07%

Post.Office (150 servers)

Version Number of Servers Percent
4.33120.67%
4.2.23020.00%
4.1.2.41912.67%
3.5.3149.33%
4.2.1.396.00%
3.9.2.353.33%
4.2.1.142.67%
3.1.242.67%
3.9.232.00%
3.5.132.00%
4.1.132.00%
3.5.3J21.33%
3.9.1.321.33%
3.8.7.421.33%
4.1.2.321.33%
4.1.0.321.33%
3.5.421.33%
4.0.121.33%
4.221.33%
Other96.00%

Gordano Messaging Suite (GMS) (79 servers)

Version Number of Servers Percent
Other79100.00%

GroupWise (78 servers)

Version Number of Servers Percent
14.2.22126.92%
14.2.1810.26%
6.5.778.97%
14.0.167.69%
14.2.067.69%
14.0.045.13%
7.0.333.85%
6.0.433.85%
7.0.422.56%
12.0.122.56%
6.0.222.56%
14.0.222.56%
18.0.011.28%
8.0.211.28%
12.0.211.28%
6.5.211.28%
6.5.511.28%
12.0.411.28%
8.0.311.28%
6.5.011.28%
6.0.311.28%
7.0.111.28%
7.0.211.28%
8.0.111.28%
Other00.00%

Trend Micro (62 servers)

Version Number of Servers Percent
5.72133.87%
5.181219.35%
5.51016.13%
7.0812.90%
7.558.06%
3.5323.23%
9.011.61%
811.61%
8.511.61%
7.111.61%
Other00.00%

InterScan VirusWall (27 servers)

Version Number of Servers Percent
Other27100.00%

VisNetic (23 servers)

Version Number of Servers Percent
9.3.2.0730.43%
5.0.2.328.70%
5.5.8.328.70%
5.8.6.628.70%
8.0.3.114.35%
5.3.5.014.35%
8.5.0.814.35%
9.1.4.114.35%
5.0.2.014.35%
9.1.4.014.35%
6.2.2.014.35%
8.0.314.35%
8.5.0.514.35%
7.6.1.014.35%
Other00.00%

Mirapoint (14 servers)

Version Number of Servers Percent
4.4.2a-FCS428.57%
4.4.3-GA321.43%
4.3.5-GA321.43%
4.4.6-GA17.14%
4.4.3a-GA17.14%
3.10.10a-GA17.14%
4.4.4-GA17.14%
Other00.00%

OpenVMS (10 servers)

Version Number of Servers Percent
7.3660.00%
8.4330.00%
8.2110.00%
Other00.00%

Mercury (8 servers)

Version Number of Servers Percent
3.32450.00%
1.48337.50%
3.21112.50%
Other00.00%

WebSTAR V (6 servers)

Version Number of Servers Percent
5.4.1350.00%
5.3.4116.67%
5.4.0116.67%
5.3.2116.67%
Other00.00%

Interscan (6 servers)

Version Number of Servers Percent
3.81-Build_1022233.33%
3.5 (build 1294)116.67%
3.8-Build_1080116.67%
3.8-Build_3013116.67%
3.81-Build_1084116.67%
Other00.00%

MessageWall (4 servers)

Version Number of Servers Percent
1.0.84100.00%
Other00.00%

Neon Mail Server (4 servers)

Version Number of Servers Percent
3.1.0250.00%
3.1.2125.00%
3.1.3125.00%
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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