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Mail (MX) Server Survey
September 1st, 2015

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 Queried2,396,615   100.0%
Number of Servers that didn't respond434,35418.12%
    Server didn't open socket424,42017.71%
    Server didn't provide banner9,9340.41%
Server provided banner1,962,26181.88%
Server banner identifies software in use1,143,69047.72%

As indicated by the above table, of the 2,396,615 servers queried, only 1,143,690 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
Exim604,84352.89%
Postfix367,95232.17%
Sendmail79,7976.98%
MailEnable28,9542.53%
Microsoft27,2752.38%
MDaemon17,5701.54%
IMail3,9200.34%
CommuniGate Pro2,4600.22%
Lotus Domino2,2200.19%
WinWebMail1,8330.16%
XMail1,5430.13%
Qmail Toaster1,1930.10%
SurgeSMTP8360.07%
Kerio8290.07%
Merak5490.05%
ArGoSoft3810.03%
MagicMail2670.02%
OpenSMTPD2410.02%
Post.Office2320.02%
GroupWise2050.02%
Gordano Messaging Suite (GMS)1940.02%
Trend Micro1290.01%
InterScan VirusWall640.01%
Mirapoint530.00%
VisNetic460.00%
Mercury240.00%
OpenVMS200.00%
Interscan140.00%
WebSTAR V120.00%
ModusMail110.00%
Neon Mail Server100.00%
MessageWall60.00%
NetIQ MailMarshal40.00%
WebSTAR30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (604,843 servers)

Version Number of Servers Percent
4.85422,60169.87%
4.8465,47610.83%
4.8220,7893.44%
4.8019,4223.21%
4.80.118,5193.06%
4.7217,3762.87%
4.7615,4542.56%
Other25,2064.17%

Postfix (367,952 servers)

Version Number of Servers Percent
Other367,952100.00%

Sendmail (79,797 servers)

Version Number of Servers Percent
8.14.517,65322.12%
8.13.816,48420.66%
8.14.414,69418.41%
8.13.19,69012.14%
8.14.35,3716.73%
8.12.11.200603081,9082.39%
8.14.71,8422.31%
8.14.91,6692.09%
8.13.6.200606141,2241.53%
8.14.21,0101.27%
8.12.108461.06%
8.11.68261.04%
Other6,5808.25%

MailEnable (28,954 servers)

Version Number of Servers Percent
8.60--2,2807.87%
6.5--1,9336.68%
1.986--1,8346.33%
8.53--1,5105.22%
8.51--1,1103.83%
8.60-8.60-9783.38%
5.10--9583.31%
8.04--8632.98%
8.60--8.608472.93%
4.26--7142.47%
6.0--6822.36%
8.00--6582.27%
7.06--6142.12%
8.50--6042.09%
8.55--4171.44%
6.88-6.88-4111.42%
7.07--4071.41%
7.0--3891.34%
7.50--3731.29%
6.57--3601.24%
1.981--3601.24%
6.70--3531.22%
7.53--3261.13%
Other9,97334.44%

Microsoft (27,275 servers)

Version Number of Servers Percent
6.0.3790.467520,19374.03%
6.0.3790.39592,1707.96%
7.5.7601.175141,8786.89%
6.0.3790.18306282.30%
8.5.9600.163844481.64%
7.0.6002.182644191.54%
5.0.2195.73812991.10%
8.0.9200.163842971.09%
Other9433.46%

MDaemon (17,570 servers)

Version Number of Servers Percent
15.0.33,36519.15%
11.0.38925.08%
11.0.08004.55%
13.5.17104.04%
13.0.57074.02%
13.0.47034.00%
15.0.15613.19%
14.5.24152.36%
12.5.64122.34%
13.6.34082.32%
10.0.04052.31%
14.5.34022.29%
14.0.33902.22%
10.1.23241.84%
12.5.43161.80%
15.0.02721.55%
10.1.12661.51%
14.0.22521.43%
10.1.02271.29%
9.6.12151.22%
13.6.22131.21%
13.0.21961.12%
9.6.61911.09%
13.6.01841.05%
9.6.21811.03%
Other4,56325.97%

IMail (3,920 servers)

Version Number of Servers Percent
8.2244011.22%
12.3.0.1003478.85%
12.4.2.273117.93%
12.5.3.932987.60%
9.232476.30%
12.4.1.151995.08%
8.151904.85%
8.051614.11%
12.5.1.601473.75%
12.5.2.621423.62%
12.2.0.2351253.19%
11.51142.91%
11.031112.83%
12.5.0.2461022.60%
11.01651.66%
11.02641.63%
10.02621.58%
7.07591.51%
12.4.1.9571.45%
7.15521.33%
12.1.0.270471.20%
8.00451.15%
12.4.0.166451.15%
6.06411.05%
Other44911.45%

CommuniGate Pro (2,460 servers)

Version Number of Servers Percent
5.1.1625610.41%
6.0.91576.38%
6.1.21425.77%
6.0.111275.16%
6.1.4943.82%
5.2.20913.70%
5.4.11883.58%
6.0.10803.25%
6.0.7662.68%
5.3.15552.24%
5.3.13522.11%
6.0.8502.03%
5.2.3491.99%
4.1.8491.99%
5.0.14461.87%
6.0.5441.79%
5.2.16311.26%
6.1.1311.26%
5.4.6291.18%
5.4.8291.18%
4.2.10281.14%
5.4.10261.06%
6.1.5251.02%
Other81533.13%

Lotus Domino (2,220 servers)

Version Number of Servers Percent
8.5.331714.28%
8.5.3FP630913.92%
8.5.21094.91%
8.5.1833.74%
8.5.3FP3813.65%
8.5.2FP4723.24%
8.5.3FP2683.06%
7.0.2673.02%
8.5642.88%
8.5.3FP4612.75%
8.5.2FP3562.52%
8.5.3FP1552.48%
8.5.3FP5522.34%
8.5.2FP2502.25%
7.0.3462.07%
7.0.1371.67%
7.0361.62%
8.5.1FP5351.58%
8.0.1341.53%
8.0321.44%
8.5.2FP1271.22%
6.5.1271.22%
8.0.2271.22%
6.5.3231.04%
6.5.4231.04%
Other42919.32%

WinWebMail (1,833 servers)

Version Number of Servers Percent
3.8.1.329816.26%
3.9.0.729516.09%
3.7.6.11618.78%
3.8.0.11447.86%
3.9.0.11276.93%
3.8.1.5935.07%
3.8.1.1925.02%
3.7.3.1894.86%
3.8.5.1884.80%
3.8.6.1744.04%
3.7.7.3703.82%
3.7.1.1492.67%
3.8.2.1492.67%
3.8.3.1301.64%
3.7.5.1281.53%
3.7.0.5221.20%
3.8.3.3211.15%
3.9.0.5201.09%
Other834.53%

XMail (1,543 servers)

Version Number of Servers Percent
1.2758738.04%
1.2244428.78%
1.2518111.73%
1.261298.36%
1.24674.34%
1.21342.20%
1.23241.56%
1.20181.17%
Other593.82%

Qmail Toaster (1,193 servers)

Version Number of Servers Percent
1.31,12193.96%
1.2221.84%
1.03.5151.26%
Other352.93%

SurgeSMTP (836 servers)

Version Number of Servers Percent
6.9c-122126.44%
6.5a2-211113.28%
6.7c-1819.69%
6.5a-1475.62%
6.3c2-2323.83%
3.9e-1242.87%
6.4a-1232.75%
5.3h2-2222.63%
5.2a-1212.51%
3.8k4-4192.27%
6.9d-29151.79%
6.1c-1121.44%
4.0u4-4111.32%
6.0a5-591.08%
Other18822.49%

Kerio (829 servers)

Version Number of Servers Percent
6.7.317420.99%
6.7.08510.25%
6.6.2728.69%
6.5.2587.00%
6.5.0536.39%
6.7.2455.43%
6.4.1455.43%
6.3.1384.58%
6.6.1384.58%
6.7.1374.46%
6.5.1273.26%
6.3.0202.41%
6.4.0192.29%
6.4.2192.29%
6.6.0131.57%
6.2.0111.33%
6.1.3101.21%
Other657.84%

Merak (549 servers)

Version Number of Servers Percent
8.0.317131.15%
8.9.17413.48%
8.5.0427.65%
8.3.8325.83%
7.5.2305.46%
7.4.5274.92%
7.6.4224.01%
7.6.1152.73%
8.3.15122.19%
7.0.1112.00%
7.4.2101.82%
7.2.091.64%
8.2.481.46%
8.9.081.46%
Other7814.21%

ArGoSoft (381 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)11429.92%
1.8 (1.8.9.3)5414.17%
1.8 (1.8.9.5)4912.86%
1.8 (1.8.9.1)359.19%
1.8 (1.8.8.8)215.51%
1.8 (1.8.8.7)205.25%
1.8 (1.8.9.2)123.15%
1.8 (1.8.9.4)92.36%
1.8 (1.8.6.0)71.84%
1.8 (1.8.7.3)61.57%
1.8 (1.8.8.2)41.05%
1.8 (1.8.8.9)41.05%
Other4612.07%

MagicMail (267 servers)

Version Number of Servers Percent
Other267100.00%

OpenSMTPD (241 servers)

Version Number of Servers Percent
Other241100.00%

Post.Office (232 servers)

Version Number of Servers Percent
4.2.24519.40%
3.5.33314.22%
4.1.2.42711.64%
4.3208.62%
4.1.0.2125.17%
4.1.193.88%
4.2.1.393.88%
3.9.2.383.45%
3.1.2J62.59%
4.0.162.59%
4.2.1.162.59%
4.252.16%
3.5.3J41.72%
3.8.7.441.72%
3.1.231.29%
4.1.0.331.29%
3.9.131.29%
3.5.131.29%
4.1.2.331.29%
3.9.231.29%
Other208.62%

GroupWise (205 servers)

Version Number of Servers Percent
14.0.13718.05%
7.0.3209.76%
6.5.7209.76%
8.0.3188.78%
8.0.2178.29%
7.0.2115.37%
14.0.0104.88%
7.0.483.90%
14.0.283.90%
12.0.273.41%
6.5.652.44%
7.0.152.44%
14.2.052.44%
6.0.452.44%
6.5.441.95%
12.0.341.95%
12.0.131.46%
6.0.331.46%
8.0.031.46%
Other125.85%

Gordano Messaging Suite (GMS) (194 servers)

Version Number of Servers Percent
Other194100.00%

Trend Micro (129 servers)

Version Number of Servers Percent
5.74937.98%
5.52418.60%
5.182217.05%
7.01310.08%
7.186.20%
8.543.10%
3.5332.33%
7.521.55%
Other43.10%

InterScan VirusWall (64 servers)

Version Number of Servers Percent
Other64100.00%

Mirapoint (53 servers)

Version Number of Servers Percent
4.3.5-GA916.98%
4.4.3-GA713.21%
4.3.6-GA59.43%
4.4.2a-FCS47.55%
4.4.5-GA47.55%
4.4.4-GA35.66%
4.4.6-GA35.66%
4.3.3-GA23.77%
3.10.10a-GA23.77%
4.1.9-GA23.77%
4.4.5a-GA23.77%
4.1.10-GA23.77%
4.1.5-GA23.77%
3.10.4-GA11.89%
4.1.6-GA11.89%
3.7.5a-GA11.89%
3.8.7a11.89%
3.8.4-GA11.89%
3.10.2-GA11.89%
Other00.00%

VisNetic (46 servers)

Version Number of Servers Percent
9.3.2.01021.74%
9.1.4.1613.04%
6.2.2.048.70%
8.5.0.848.70%
5.8.6.636.52%
5.0.2.336.52%
5.5.8.324.35%
7.6.1.024.35%
9.1.4.024.35%
5.3.5.024.35%
7.2.4.112.17%
8.5.0.512.17%
8.3.0.112.17%
8.0.3.112.17%
8.0.312.17%
5.0.2.012.17%
7.2.4.012.17%
9.1.4.1 provided by Techfount Systems Pte Ltd12.17%
Other00.00%

Mercury (24 servers)

Version Number of Servers Percent
1.481250.00%
3.321041.67%
3.2114.17%
4.x14.17%
Other00.00%

OpenVMS (20 servers)

Version Number of Servers Percent
8.3945.00%
7.3630.00%
8.4525.00%
Other00.00%

Interscan (14 servers)

Version Number of Servers Percent
3.55 (build 1016)321.43%
3.81-Build_1084214.29%
3.81-Build_1022214.29%
3.55 (build 1029)214.29%
3.5 (build 1294)17.14%
3.8-Build_301317.14%
3.53 (build 2013)17.14%
3.53 (build 2017)17.14%
3.8-Build_108017.14%
Other00.00%

WebSTAR V (12 servers)

Version Number of Servers Percent
5.4.1650.00%
5.4.0433.33%
5.3.318.33%
5.3.418.33%
Other00.00%

ModusMail (11 servers)

Version Number of Servers Percent
4.35.477.0763.64%
4.1.361.2119.09%
3.2.315.019.09%
4.35.477.819.09%
3.1.302.019.09%
Other00.00%

Neon Mail Server (10 servers)

Version Number of Servers Percent
3.0.7440.00%
3.1.0220.00%
3.1.4110.00%
3.1.2110.00%
3.1.3110.00%
3.0.6110.00%
Other00.00%

MessageWall (6 servers)

Version Number of Servers Percent
1.0.86100.00%
Other00.00%

NetIQ MailMarshal (4 servers)

Version Number of Servers Percent
5.5.6.5250.00%
5.5.4.17125.00%
5.5.6.7125.00%
Other00.00%

WebSTAR (3 servers)

Version Number of Servers Percent
Other3100.00%




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