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Mail (MX) Server Survey
December 1st, 2018

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 Queried1,803,988   100.0%
Number of Servers that didn't respond319,38217.70%
    Server didn't open socket313,43817.37%
    Server didn't provide banner5,9440.33%
Server provided banner1,484,60682.30%
Server banner identifies software in use918,99550.94%

As indicated by the above table, of the 1,803,988 servers queried, only 918,995 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
Exim522,23256.83%
Postfix316,21934.41%
Sendmail38,2344.16%
MailEnable20,2032.20%
MDaemon8,6150.94%
Microsoft5,9200.64%
IMail1,6440.18%
CommuniGate Pro1,3580.15%
XMail8780.10%
Lotus Domino6150.07%
WinWebMail6130.07%
Qmail Toaster6130.07%
SurgeSMTP5620.06%
Kerio3150.03%
Merak2060.02%
MagicMail1830.02%
ArGoSoft1390.02%
Post.Office1370.01%
Gordano Messaging Suite (GMS)820.01%
GroupWise800.01%
Trend Micro570.01%
InterScan VirusWall190.00%
VisNetic170.00%
OpenVMS160.00%
Mirapoint110.00%
Mercury70.00%
Interscan50.00%
Neon Mail Server50.00%
MessageWall30.00%
WebSTAR V30.00%
ModusMail20.00%
WebSTAR20.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (522,232 servers)

Version Number of Servers Percent
4.91399,75876.55%
4.8931,7246.07%
4.8728,9215.54%
4.8412,8702.46%
4.9012,7512.44%
4.805,4421.04%
Other30,7665.89%

Postfix (316,219 servers)

Version Number of Servers Percent
Other316,219100.00%

Sendmail (38,234 servers)

Version Number of Servers Percent
8.15.211,66630.51%
8.14.47,97920.87%
8.13.84,92312.88%
8.14.53,1798.31%
8.13.12,7067.08%
8.14.72,6216.86%
8.14.91,6064.20%
8.14.39272.42%
Other2,6276.87%

MailEnable (20,203 servers)

Version Number of Servers Percent
10.12--2,86614.19%
9.00--1,9849.82%
9.16--1,7668.74%
8.60--6353.14%
8.53--6052.99%
6.5--4632.29%
8.51--4152.05%
10.18--3471.72%
8.60-8.60-3311.64%
8.04--3121.54%
10.16--3091.53%
1.986--2731.35%
9.75--2411.19%
10.19--2111.04%
9.00--9.002081.03%
10.14--2061.02%
Other9,03144.70%

MDaemon (8,615 servers)

Version Number of Servers Percent
18.5.090310.48%
13.5.14955.75%
18.0.24605.34%
13.6.34264.94%
16.5.23494.05%
13.0.43464.02%
13.0.53413.96%
11.0.33393.93%
11.0.03263.78%
12.5.41892.19%
12.5.61852.15%
16.0.41611.87%
14.5.21571.82%
17.5.21461.69%
15.0.31441.67%
17.5.31401.63%
10.0.01291.50%
10.1.21271.47%
16.5.11181.37%
10.1.0991.15%
16.0.1971.13%
17.5.1891.03%
13.0.2871.01%
Other2,76232.06%

Microsoft (5,920 servers)

Version Number of Servers Percent
6.0.3790.46753,04051.35%
7.5.7601.1751477613.11%
8.5.9600.1638468511.57%
6.0.3790.39593636.13%
10.0.14393.02053.46%
8.0.9200.163841622.74%
5.0.2195.53291372.31%
7.0.6002.182641051.77%
6.0.3790.1830921.55%
5.0.2195.6713691.17%
Other2864.83%

IMail (1,644 servers)

Version Number of Servers Percent
12.5.6.10130418.49%
8.221619.79%
12.4.1.151509.12%
12.5.5.1151247.54%
12.5.4.1461056.39%
9.231016.14%
12.5.3.93905.47%
12.3.0.100814.93%
8.15744.50%
8.05482.92%
11.03482.92%
12.5.5.117281.70%
10.01201.22%
10.02201.22%
11.5201.22%
7.07191.16%
7.15181.09%
Other23314.17%

CommuniGate Pro (1,358 servers)

Version Number of Servers Percent
6.1.16735.38%
6.0.11523.83%
6.1.18503.68%
6.2.8493.61%
5.4.11473.46%
6.2.7473.46%
5.3.13372.72%
5.1.16362.65%
5.2.20352.58%
6.1.11342.50%
6.2.9302.21%
6.0.9282.06%
6.2.4271.99%
6.1.10261.91%
6.2.1251.84%
6.1.19251.84%
6.1.2241.77%
5.2.3231.69%
6.2.0221.62%
6.1.15211.55%
6.1.20201.47%
4.1.8201.47%
6.2.5191.40%
6.1.13191.40%
6.1.17181.33%
6.1.12181.33%
6.1.8181.33%
6.2.6181.33%
6.1.5161.18%
5.4.4161.18%
6.1.14161.18%
Other44933.06%

XMail (878 servers)

Version Number of Servers Percent
1.2741847.61%
1.2227230.98%
1.25576.49%
1.26536.04%
1.24364.10%
1.21111.25%
Other313.53%

Lotus Domino (615 servers)

Version Number of Servers Percent
8.5.3FP612320.00%
8.5.39114.80%
8.5.2315.04%
7.0.2284.55%
8.5.1233.74%
8.5213.41%
8.5.3FP2152.44%
8.5.3FP1152.44%
8.5.2FP4152.44%
8.5.3FP3132.11%
8.5.3FP4132.11%
7.0.3121.95%
8.5.2FP2121.95%
7.0111.79%
8.0101.63%
8.5.2FP3101.63%
6.591.46%
8.0.191.46%
8.5.1FP581.30%
7.0.181.30%
6.5.571.14%
8.5.3FP571.14%
7.0.471.14%
Other11719.02%

WinWebMail (613 servers)

Version Number of Servers Percent
3.9.0.711819.25%
3.8.1.37311.91%
4.2.0.1497.99%
3.9.0.1426.85%
3.8.0.1335.38%
3.7.6.1304.89%
4.1.0.1274.40%
3.8.1.5254.08%
4.0.0.1243.92%
3.8.5.1182.94%
3.7.3.1182.94%
3.8.1.1172.77%
3.8.6.1172.77%
3.9.3.1142.28%
3.8.2.1132.12%
3.9.5.3132.12%
3.9.2.1111.79%
3.7.7.3101.63%
3.8.3.1101.63%
3.7.1.171.14%
3.9.5.171.14%
Other376.04%

Qmail Toaster (613 servers)

Version Number of Servers Percent
1.346776.18%
1.0311118.11%
1.03.5111.79%
1.2101.63%
1.03.691.47%
Other50.82%

SurgeSMTP (562 servers)

Version Number of Servers Percent
7.3i2-211219.93%
7.3e2-210719.04%
7.1e-1407.12%
6.5a2-2305.34%
6.9c-1234.09%
7.2i-1234.09%
6.7c-1213.74%
7.2a-1203.56%
7.3o2-2193.38%
3.9e-1142.49%
7.0c2-2132.31%
6.5a-1122.14%
7.2e-2111.96%
4.0u4-481.42%
5.2a-171.25%
7.3c3-371.25%
6.4a-171.25%
6.1c-161.07%
7.3n-161.07%
Other7613.52%

Kerio (315 servers)

Version Number of Servers Percent
6.7.36420.32%
6.7.04514.29%
6.6.2319.84%
6.7.2299.21%
6.5.2288.89%
6.6.1165.08%
6.4.1154.76%
6.5.0144.44%
6.7.1134.13%
6.3.1103.17%
6.4.082.54%
6.6.061.90%
6.3.061.90%
6.5.151.59%
6.1.341.27%
Other216.67%

Merak (206 servers)

Version Number of Servers Percent
8.0.35426.21%
8.9.14220.39%
8.5.0157.28%
7.4.5115.34%
7.6.1115.34%
7.5.2104.85%
8.3.8104.85%
7.6.483.88%
9.0.373.40%
7.4.241.94%
7.2.041.94%
6.0.831.46%
7.0.131.46%
7.6.031.46%
Other2110.19%

MagicMail (183 servers)

Version Number of Servers Percent
Other183100.00%

ArGoSoft (139 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)5136.69%
1.8 (1.8.9.3)2014.39%
1.8 (1.8.9.5)1812.95%
1.8 (1.8.9.1)1410.07%
1.8 (1.8.8.8)53.60%
1.8 (1.8.7.3)32.16%
1.8 (1.8.8.7)32.16%
1.8 (1.8.2.1)21.44%
1.8 (1.8.9.4)21.44%
1.8 (1.8.6.0)21.44%
1.8 (1.8.9.2)21.44%
1.8 (1.8.5.8)21.44%
1.8 (1.8.8.9)21.44%
1.8 (1.8.8.4)21.44%
1.8 (1.8.7.6)21.44%
Other96.47%

Post.Office (137 servers)

Version Number of Servers Percent
4.33424.82%
4.2.22216.06%
4.1.2.41510.95%
4.4128.76%
3.5.3118.03%
4.2.1.385.84%
4.1.142.92%
3.5.132.19%
3.5.3J32.19%
3.9.2.332.19%
4.2.1.132.19%
3.9.221.46%
4.0.121.46%
3.8.7.421.46%
Other139.49%

Gordano Messaging Suite (GMS) (82 servers)

Version Number of Servers Percent
Other82100.00%

GroupWise (80 servers)

Version Number of Servers Percent
14.2.21417.50%
18.0.21012.50%
14.2.3810.00%
14.2.167.50%
6.5.745.00%
14.2.045.00%
7.0.333.75%
18.0.033.75%
14.0.133.75%
18.1.033.75%
8.0.333.75%
7.0.222.50%
18.0.122.50%
6.0.422.50%
14.0.022.50%
6.5.511.25%
7.0.411.25%
7.0.111.25%
6.5.111.25%
8.0.011.25%
6.0.311.25%
6.5.011.25%
6.5.611.25%
6.5.411.25%
6.0.211.25%
12.0.111.25%
Other00.00%

Trend Micro (57 servers)

Version Number of Servers Percent
5.71831.58%
5.181221.05%
5.5814.04%
7.0712.28%
7.558.77%
3.5323.51%
8.511.75%
7.5ready11.75%
811.75%
9.011.75%
7.111.75%
Other00.00%

InterScan VirusWall (19 servers)

Version Number of Servers Percent
Other19100.00%

VisNetic (17 servers)

Version Number of Servers Percent
9.3.2.0741.18%
5.5.8.3211.76%
8.0.315.88%
5.8.6.615.88%
5.0.2.315.88%
9.1.4.015.88%
8.0.3.115.88%
5.0.2.015.88%
6.2.2.015.88%
8.5.0.815.88%
Other00.00%

OpenVMS (16 servers)

Version Number of Servers Percent
8.4850.00%
7.3531.25%
8.3212.50%
8.216.25%
Other00.00%

Mirapoint (11 servers)

Version Number of Servers Percent
4.4.2a-FCS218.18%
4.3.5-GA218.18%
4.4.3-GA218.18%
4.1.9-GA19.09%
4.3.6-GA19.09%
3.10.10a-GA19.09%
4.4.5-GA19.09%
4.4.6-GA19.09%
Other00.00%

Mercury (7 servers)

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

Interscan (5 servers)

Version Number of Servers Percent
3.81-Build_1084120.00%
3.8-Build_3013120.00%
3.8-Build_1080120.00%
3.81-Build_1022120.00%
3.5 (build 1294)120.00%
Other00.00%

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.3120.00%
3.0.7120.00%
3.1.2120.00%
3.1.0120.00%
3.0.8120.00%
Other00.00%

MessageWall (3 servers)

Version Number of Servers Percent
1.0.83100.00%
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%




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