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Mail (MX) Server Survey
May 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 Queried1,755,511   100.0%
Number of Servers that didn't respond309,83317.65%
    Server didn't open socket304,08517.32%
    Server didn't provide banner5,7480.33%
Server provided banner1,445,67882.35%
Server banner identifies software in use897,56751.13%

As indicated by the above table, of the 1,755,511 servers queried, only 897,567 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
Exim512,00457.04%
Postfix309,02434.43%
Sendmail36,7914.10%
MailEnable19,4542.17%
MDaemon7,9210.88%
Microsoft5,2080.58%
IMail1,4920.17%
CommuniGate Pro1,2960.14%
XMail8340.09%
Qmail Toaster7440.08%
WinWebMail5580.06%
Lotus Domino5470.06%
SurgeSMTP5340.06%
Kerio2720.03%
Merak1800.02%
MagicMail1770.02%
Post.Office1330.01%
ArGoSoft1170.01%
GroupWise800.01%
Gordano Messaging Suite (GMS)720.01%
Trend Micro510.01%
InterScan VirusWall200.00%
OpenVMS150.00%
VisNetic140.00%
Mirapoint80.00%
Mercury70.00%
Interscan40.00%
WebSTAR V30.00%
ModusMail20.00%
WebSTAR20.00%
MessageWall20.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (512,004 servers)

Version Number of Servers Percent
4.91407,74279.64%
4.8723,2014.53%
4.8919,5363.82%
4.8411,5662.26%
4.9210,3362.02%
4.908,6531.69%
Other30,9706.05%

Postfix (309,024 servers)

Version Number of Servers Percent
Other309,024100.00%

Sendmail (36,791 servers)

Version Number of Servers Percent
8.15.211,99832.61%
8.14.47,27719.78%
8.13.84,13011.23%
8.14.73,1118.46%
8.14.52,9778.09%
8.13.12,6077.09%
8.14.91,5114.11%
8.14.37972.17%
Other2,3836.48%

MailEnable (19,454 servers)

Version Number of Servers Percent
10.12--4,05320.83%
9.00--1,5377.90%
9.16--1,4637.52%
8.60--5222.68%
10.20--5142.64%
8.53--4272.19%
6.5--3801.95%
8.51--3161.62%
8.60-8.60-3051.57%
10.16--2471.27%
10.18--2441.25%
10.19--2431.25%
8.04--2421.24%
1.986--2251.16%
9.75--2131.09%
10.20--10.202131.09%
9.00--9.002061.06%
Other8,10441.66%

MDaemon (7,921 servers)

Version Number of Servers Percent
18.5.36648.38%
13.5.14856.12%
18.5.24005.05%
13.6.33985.02%
13.0.43264.12%
13.0.53123.94%
18.5.13093.90%
11.0.33053.85%
11.0.03033.83%
16.5.22673.37%
12.5.41812.29%
12.5.61732.18%
14.5.21491.88%
18.0.21431.81%
10.1.21231.55%
16.0.41181.49%
15.0.31161.46%
10.0.01111.40%
18.5.0991.25%
10.1.0961.21%
16.5.1891.12%
17.5.2841.06%
17.5.3831.05%
13.0.2801.01%
Other2,50731.65%

Microsoft (5,208 servers)

Version Number of Servers Percent
6.0.3790.46752,52948.56%
7.5.7601.1751467412.94%
8.5.9600.1638465812.63%
6.0.3790.39593035.82%
10.0.14393.26081803.46%
8.0.9200.163841522.92%
5.0.2195.53291292.48%
6.0.3790.1830861.65%
7.0.6002.18264821.57%
5.0.2195.6713671.29%
10.0.14393.0591.13%
Other2895.55%

IMail (1,492 servers)

Version Number of Servers Percent
12.5.6.10126317.63%
12.4.1.151429.52%
8.221248.31%
12.5.5.115936.23%
12.5.3.93916.10%
9.23865.76%
12.5.4.146855.70%
12.3.0.100765.09%
8.15634.22%
8.05453.02%
11.03453.02%
12.5.7.59402.68%
12.5.7.58402.68%
12.5.5.117211.41%
11.5201.34%
10.02201.34%
7.07161.07%
8.00161.07%
10.01151.01%
Other19112.80%

CommuniGate Pro (1,296 servers)

Version Number of Servers Percent
6.2.12896.87%
6.1.16574.40%
6.2.10503.86%
6.0.11483.70%
5.4.11433.32%
6.1.18393.01%
5.2.20372.85%
5.3.13362.78%
5.1.16332.55%
6.2.11292.24%
6.1.11292.24%
6.2.7282.16%
6.1.20272.08%
6.0.9241.85%
6.1.10231.77%
5.2.3221.70%
6.2.1201.54%
6.1.2201.54%
6.2.9191.47%
6.1.13181.39%
6.1.19181.39%
4.1.8171.31%
6.1.15161.23%
6.1.12161.23%
6.1.5161.23%
6.2.4161.23%
6.2.8151.16%
6.1.17141.08%
6.1.14141.08%
6.1.9141.08%
4.2.10141.08%
6.2.5131.00%
Other42232.56%

XMail (834 servers)

Version Number of Servers Percent
1.2739847.72%
1.2226531.77%
1.26536.35%
1.25465.52%
1.24323.84%
1.2191.08%
Other313.72%

Qmail Toaster (744 servers)

Version Number of Servers Percent
1.359479.84%
1.0312216.40%
1.03.5111.48%
1.03.691.21%
Other81.08%

WinWebMail (558 servers)

Version Number of Servers Percent
3.9.0.79717.38%
4.2.0.17413.26%
3.8.1.36211.11%
3.9.0.1396.99%
3.8.0.1346.09%
3.7.6.1244.30%
3.8.1.5234.12%
4.1.0.1213.76%
4.0.0.1203.58%
3.8.5.1152.69%
3.7.3.1152.69%
3.9.2.1132.33%
3.8.1.1132.33%
3.8.6.1122.15%
3.8.3.1111.97%
3.9.3.1111.97%
3.7.7.3111.97%
3.8.2.1101.79%
3.9.5.3101.79%
3.7.0.561.08%
Other376.63%

Lotus Domino (547 servers)

Version Number of Servers Percent
8.5.3FP610719.56%
8.5.38114.81%
7.0.2254.57%
8.5.2254.57%
8.5.1193.47%
8.5183.29%
8.5.3FP1152.74%
8.5.3FP3132.38%
7.0132.38%
8.5.3FP2132.38%
7.0.3122.19%
8.5.3FP4112.01%
8.5.2FP2101.83%
8.0.1101.83%
8.0101.83%
8.5.1FP5101.83%
8.5.2FP391.65%
8.5.2FP491.65%
7.0.481.46%
6.571.28%
8.5.3FP571.28%
6.5.471.28%
7.0.161.10%
8.5.2FP4HF75961.10%
6.5.561.10%
7.0.3FP161.10%
Other8415.36%

SurgeSMTP (534 servers)

Version Number of Servers Percent
7.3o4-411621.72%
7.3e2-28115.17%
7.3i2-2438.05%
7.1e-1356.55%
6.5a2-2254.68%
6.7c-1203.75%
6.9c-1193.56%
7.2a-1173.18%
7.2i-1163.00%
7.0c2-2142.62%
3.9e-1122.25%
7.3o2-2122.25%
6.5a-1101.87%
7.2e-2101.87%
5.2a-171.31%
4.0u4-471.31%
6.4a-161.12%
6.1c-161.12%
Other7814.61%

Kerio (272 servers)

Version Number of Servers Percent
6.7.36523.90%
6.7.03713.60%
6.6.2269.56%
6.5.2259.19%
6.7.2248.82%
6.4.1124.41%
6.5.0124.41%
6.6.1114.04%
6.7.1103.68%
6.4.082.94%
6.3.182.94%
6.6.062.21%
6.5.141.47%
5.7.931.10%
6.1.031.10%
6.3.031.10%
6.1.331.10%
Other124.41%

Merak (180 servers)

Version Number of Servers Percent
8.0.34525.00%
8.9.13921.67%
8.5.0126.67%
7.4.5105.56%
7.6.1105.56%
8.3.895.00%
9.0.373.89%
7.5.273.89%
7.6.452.78%
7.4.242.22%
7.2.042.22%
6.0.831.67%
7.0.131.67%
7.6.031.67%
4.4.121.11%
Other179.44%

MagicMail (177 servers)

Version Number of Servers Percent
Other177100.00%

Post.Office (133 servers)

Version Number of Servers Percent
4.33425.56%
4.2.22418.05%
4.41511.28%
4.1.2.41410.53%
3.5.396.77%
4.2.1.364.51%
4.1.143.01%
3.5.132.26%
3.5.3J32.26%
4.2.1.132.26%
4.0.121.50%
3.9.221.50%
3.8.7.421.50%
3.9.2.321.50%
Other107.52%

ArGoSoft (117 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)4235.90%
1.8 (1.8.9.3)1613.68%
1.8 (1.8.9.5)1512.82%
1.8 (1.8.9.1)1411.97%
1.8 (1.8.8.8)43.42%
1.8 (1.8.7.3)43.42%
1.8 (1.8.2.1)21.71%
1.8 (1.8.6.0)21.71%
1.8 (1.8.9.2)21.71%
1.8 (1.8.5.8)21.71%
1.8 (1.8.8.7)21.71%
1.8 (1.8.8.9)21.71%
1.8 (1.8.7.6)21.71%
Other86.84%

GroupWise (80 servers)

Version Number of Servers Percent
14.2.21113.75%
18.1.01113.75%
14.2.3911.25%
18.0.2810.00%
14.2.156.25%
14.0.145.00%
14.2.045.00%
6.5.733.75%
7.0.333.75%
18.0.122.50%
7.0.222.50%
14.0.022.50%
6.0.422.50%
8.0.322.50%
18.0.022.50%
7.0.111.25%
8.0.011.25%
7.0.411.25%
6.5.511.25%
6.5.011.25%
6.5.611.25%
18.1.111.25%
6.5.411.25%
6.0.211.25%
12.0.111.25%
Other00.00%

Gordano Messaging Suite (GMS) (72 servers)

Version Number of Servers Percent
Other72100.00%

Trend Micro (51 servers)

Version Number of Servers Percent
5.71427.45%
5.181223.53%
5.5815.69%
7.0713.73%
7.559.80%
8.511.96%
7.5ready11.96%
811.96%
9.011.96%
7.111.96%
Other00.00%

InterScan VirusWall (20 servers)

Version Number of Servers Percent
Other20100.00%

OpenVMS (15 servers)

Version Number of Servers Percent
8.4960.00%
7.3320.00%
8.3213.33%
8.216.67%
Other00.00%

VisNetic (14 servers)

Version Number of Servers Percent
9.3.2.0857.14%
5.5.8.3214.29%
8.0.317.14%
5.0.2.317.14%
9.1.4.017.14%
6.2.2.017.14%
Other00.00%

Mirapoint (8 servers)

Version Number of Servers Percent
4.4.2a-FCS225.00%
4.4.3-GA112.50%
4.3.6-GA112.50%
3.10.10a-GA112.50%
4.3.5-GA112.50%
4.4.5-GA112.50%
4.4.6-GA112.50%
Other00.00%

Mercury (7 servers)

Version Number of Servers Percent
1.48457.14%
3.32342.86%
Other00.00%

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%

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%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.0.81100.00%
Other00.00%




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