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Mail (MX) Server Survey
August 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 Queried2,024,632   100.0%
Number of Servers that didn't respond371,14618.33%
    Server didn't open socket363,83717.97%
    Server didn't provide banner7,3090.36%
Server provided banner1,653,48681.67%
Server banner identifies software in use1,012,10949.99%

As indicated by the above table, of the 2,024,632 servers queried, only 1,012,109 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
Exim570,21956.34%
Postfix339,25233.52%
Sendmail47,9084.73%
MailEnable23,0552.28%
MDaemon11,6271.15%
Microsoft9,6470.95%
IMail2,1070.21%
CommuniGate Pro1,7700.17%
XMail1,0540.10%
WinWebMail1,0130.10%
Lotus Domino9970.10%
Qmail Toaster8030.08%
SurgeSMTP6630.07%
Kerio4400.04%
OpenSMTPD3130.03%
Merak2900.03%
MagicMail1930.02%
ArGoSoft1830.02%
Post.Office1630.02%
Gordano Messaging Suite (GMS)1130.01%
GroupWise1010.01%
Trend Micro660.01%
VisNetic290.00%
InterScan VirusWall260.00%
Mirapoint200.00%
OpenVMS150.00%
Mercury100.00%
ModusMail70.00%
WebSTAR V70.00%
Interscan60.00%
MessageWall60.00%
Neon Mail Server50.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (570,219 servers)

Version Number of Servers Percent
4.89291,00651.03%
4.87171,19430.02%
4.8823,2334.07%
4.8418,7343.29%
4.8010,7981.89%
4.869,0361.58%
4.857,6541.34%
4.727,4671.31%
4.826,9381.22%
4.766,8271.20%
Other17,3323.04%

Postfix (339,252 servers)

Version Number of Servers Percent
Other339,252100.00%

Sendmail (47,908 servers)

Version Number of Servers Percent
8.14.511,82524.68%
8.14.411,45323.91%
8.13.87,74516.17%
8.13.14,84910.12%
8.15.22,5305.28%
8.14.32,2994.80%
8.14.71,7273.60%
8.14.91,3792.88%
8.14.24821.01%
Other3,6197.55%

MailEnable (23,055 servers)

Version Number of Servers Percent
9.00--3,14213.63%
8.60--1,2415.38%
9.16--1,1875.15%
8.53--1,0544.57%
6.5--8843.83%
8.51--6963.02%
1.986--6072.63%
8.04--5202.26%
8.60-8.60-4381.90%
9.74--3521.53%
5.10--3501.52%
8.50--3421.48%
9.53--3221.40%
8.00--3131.36%
9.75--2681.16%
6.0--2441.06%
7.06--2441.06%
4.26--2311.00%
Other10,62046.06%

MDaemon (11,627 servers)

Version Number of Servers Percent
17.0.21,25410.79%
16.5.29928.53%
13.5.15774.96%
11.0.04834.15%
11.0.34643.99%
13.0.44623.97%
13.0.54533.90%
13.6.34273.67%
16.0.44243.65%
16.5.13192.74%
17.0.02732.35%
12.5.62612.24%
12.5.42392.06%
15.0.32362.03%
14.5.21941.67%
10.0.01821.57%
10.1.21741.50%
15.5.31701.46%
16.0.11541.32%
10.1.11271.09%
10.1.01181.01%
Other3,64431.34%

Microsoft (9,647 servers)

Version Number of Servers Percent
6.0.3790.46755,82360.36%
7.5.7601.175141,14511.87%
8.5.9600.163847597.87%
6.0.3790.39596897.14%
8.0.9200.163841962.03%
5.0.2195.53291731.79%
6.0.3790.18301671.73%
7.0.6002.182641571.63%
5.0.2195.73811091.13%
Other4294.45%

IMail (2,107 servers)

Version Number of Servers Percent
12.5.5.11539618.79%
12.4.1.151768.35%
8.221647.78%
12.5.3.931567.40%
12.5.4.1461376.50%
9.231346.36%
12.3.0.1001024.84%
8.15964.56%
8.05683.23%
11.03602.85%
11.5552.61%
12.5.6.101351.66%
7.07311.47%
12.5.1.60301.42%
7.15291.38%
10.02281.33%
12.5.5.117271.28%
11.02231.09%
10.01231.09%
Other33715.99%

CommuniGate Pro (1,770 servers)

Version Number of Servers Percent
6.1.1618110.23%
5.1.161558.76%
6.1.11714.01%
5.4.11643.62%
6.1.10633.56%
6.0.11583.28%
5.2.20573.22%
6.1.15472.66%
6.0.9472.66%
6.1.13462.60%
6.1.2442.49%
6.1.14422.37%
6.2402.26%
6.1.12392.20%
5.3.13382.15%
5.0.14341.92%
5.2.3331.86%
6.1.5271.53%
6.1.8261.47%
4.1.8251.41%
6.0.10221.24%
5.4.4211.19%
6.1.7181.02%
5.3.15181.02%
Other55431.30%

XMail (1,054 servers)

Version Number of Servers Percent
1.2746343.93%
1.2233231.50%
1.25807.59%
1.26686.45%
1.24444.17%
1.21201.90%
1.23151.42%
Other323.04%

WinWebMail (1,013 servers)

Version Number of Servers Percent
3.9.0.722822.51%
3.8.1.315915.70%
3.9.0.1686.71%
3.7.6.1656.42%
3.8.0.1575.63%
3.8.1.5454.44%
3.9.2.1424.15%
3.8.5.1373.65%
3.8.1.1373.65%
3.8.6.1353.46%
3.9.3.1323.16%
3.7.3.1323.16%
3.7.7.3282.76%
3.8.2.1242.37%
3.7.1.1201.97%
3.8.3.1151.48%
3.7.5.1121.18%
3.9.1.1111.09%
Other666.52%

Lotus Domino (997 servers)

Version Number of Servers Percent
8.5.3FP618918.96%
8.5.313513.54%
8.5.2444.41%
8.5363.61%
7.0.2353.51%
8.5.1323.21%
8.5.3FP2282.81%
8.5.2FP4262.61%
8.5.3FP3232.31%
8.5.3FP1232.31%
7.0.3232.31%
8.5.3FP4222.21%
8.5.2FP3222.21%
8.5.3FP5222.21%
8.5.2FP2191.91%
8.0181.81%
8.0.1171.71%
8.5.1FP5161.60%
6.5.1151.50%
7.0.4151.50%
7.0141.40%
6.5.4121.20%
7.0.1121.20%
7.0.3FP1101.00%
6.5101.00%
Other17917.95%

Qmail Toaster (803 servers)

Version Number of Servers Percent
1.369987.05%
1.03647.97%
1.2141.74%
1.03.5101.25%
1.03.691.12%
Other70.87%

SurgeSMTP (663 servers)

Version Number of Servers Percent
7.2i-112719.16%
7.1e-19314.03%
6.5a2-2406.03%
7.2a-1395.88%
7.2e-2365.43%
6.9c-1324.83%
6.7c-1263.92%
6.5a-1253.77%
7.3c3-3253.77%
7.0c2-2192.87%
3.9e-1172.56%
5.2a-1152.26%
6.1c-1111.66%
7.3d-5111.66%
6.4a-191.36%
4.0u4-491.36%
3.8k4-491.36%
7.3d-481.21%
5.3h2-271.06%
6.3c2-271.06%
Other9814.78%

Kerio (440 servers)

Version Number of Servers Percent
6.7.39621.82%
6.7.05211.82%
6.5.24410.00%
6.6.2409.09%
6.7.2317.05%
6.5.0265.91%
6.4.1184.09%
6.6.1184.09%
6.7.1184.09%
6.3.1153.41%
6.5.1112.50%
6.4.0112.50%
6.3.0102.27%
6.1.381.82%
6.6.061.36%
6.4.261.36%
Other306.82%

OpenSMTPD (313 servers)

Version Number of Servers Percent
Other313100.00%

Merak (290 servers)

Version Number of Servers Percent
8.0.38529.31%
8.9.14816.55%
8.5.0268.97%
7.5.2165.52%
8.3.8155.17%
7.4.5144.83%
7.6.1124.14%
7.6.4124.14%
7.4.251.72%
7.0.151.72%
9.0.341.38%
7.2.041.38%
6.1.041.38%
6.0.831.03%
5.9.431.03%
4.2.131.03%
7.6.031.03%
8.9.031.03%
Other258.62%

MagicMail (193 servers)

Version Number of Servers Percent
Other193100.00%

ArGoSoft (183 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)6636.07%
1.8 (1.8.9.5)2312.57%
1.8 (1.8.9.3)1910.38%
1.8 (1.8.9.1)1910.38%
1.8 (1.8.7.3)63.28%
1.8 (1.8.8.7)52.73%
1.8 (1.8.8.8)52.73%
1.8 (1.8.9.2)52.73%
1.8 (1.8.6.0)42.19%
1.8 (1.8.8.9)42.19%
1.8 (1.8.9.4)31.64%
1.8 (1.8.7.6)21.09%
1.8 (1.8.8.4)21.09%
1.8 (1.8.5.9)21.09%
1.8 (1.8.5.8)21.09%
1.8 (1.8.2.1)21.09%
Other147.65%

Post.Office (163 servers)

Version Number of Servers Percent
4.2.23320.25%
4.33219.63%
4.1.2.42012.27%
3.5.3169.82%
4.2.1.395.52%
3.9.2.353.07%
3.1.242.45%
4.1.142.45%
4.2.1.142.45%
4.0.131.84%
3.9.231.84%
3.5.131.84%
3.9.1.321.23%
4.221.23%
3.5.421.23%
4.1.0.321.23%
3.8.7.421.23%
4.1.2.321.23%
3.5.3J21.23%
4.1.0.221.23%
Other116.75%

Gordano Messaging Suite (GMS) (113 servers)

Version Number of Servers Percent
Other113100.00%

GroupWise (101 servers)

Version Number of Servers Percent
14.2.21817.82%
14.2.11716.83%
14.2.0109.90%
6.5.776.93%
14.0.165.94%
14.0.254.95%
7.0.354.95%
14.0.054.95%
8.0.343.96%
7.0.232.97%
7.0.432.97%
8.0.221.98%
6.0.421.98%
12.0.121.98%
12.0.421.98%
Other109.90%

Trend Micro (66 servers)

Version Number of Servers Percent
5.72030.30%
5.181319.70%
5.51319.70%
7.0812.12%
7.557.58%
7.123.03%
3.5323.03%
8.511.52%
9.011.52%
811.52%
Other00.00%

VisNetic (29 servers)

Version Number of Servers Percent
9.3.2.0931.03%
6.2.2.0310.34%
5.8.6.6310.34%
5.0.2.326.90%
5.5.8.326.90%
8.0.313.45%
9.1.4.013.45%
8.5.0.513.45%
7.6.1.013.45%
9.1.4.113.45%
8.0.3.113.45%
5.3.5.013.45%
5.0.2.013.45%
9.1.4.1 provided by Techfount Systems Pte Ltd13.45%
8.5.0.813.45%
Other00.00%

InterScan VirusWall (26 servers)

Version Number of Servers Percent
Other26100.00%

Mirapoint (20 servers)

Version Number of Servers Percent
4.4.3-GA420.00%
4.4.2a-FCS315.00%
4.3.5-GA315.00%
4.4.7-GA210.00%
4.1.9-GA15.00%
4.4.4-GA15.00%
4.3.6-GA15.00%
3.10.10a-GA15.00%
4.4.3a-GA15.00%
3.7.5a-GA15.00%
4.4.5-GA15.00%
4.4.6-GA15.00%
Other00.00%

OpenVMS (15 servers)

Version Number of Servers Percent
8.4640.00%
7.3533.33%
8.3320.00%
8.216.67%
Other00.00%

Mercury (10 servers)

Version Number of Servers Percent
3.32440.00%
1.48440.00%
3.21110.00%
4.x110.00%
Other00.00%

ModusMail (7 servers)

Version Number of Servers Percent
4.35.477.0571.43%
4.1.361.21114.29%
4.35.477.8114.29%
Other00.00%

WebSTAR V (7 servers)

Version Number of Servers Percent
5.4.1457.14%
5.4.0114.29%
5.3.2114.29%
5.3.4114.29%
Other00.00%

Interscan (6 servers)

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

MessageWall (6 servers)

Version Number of Servers Percent
1.0.86100.00%
Other00.00%

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.0240.00%
3.1.3120.00%
3.0.7120.00%
3.1.2120.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%




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