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Mail (MX) Server Survey
February 1st, 2016

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 Queried2,368,775   100.0%
Number of Servers that didn't respond433,71618.31%
    Server didn't open socket424,87417.94%
    Server didn't provide banner8,8420.37%
Server provided banner1,935,05981.69%
Server banner identifies software in use1,143,54848.28%

As indicated by the above table, of the 2,368,775 servers queried, only 1,143,548 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
Exim612,89853.60%
Postfix374,95932.79%
Sendmail72,9636.38%
MailEnable28,0272.45%
Microsoft21,7411.90%
MDaemon17,0721.49%
IMail3,4690.30%
CommuniGate Pro2,4200.21%
Lotus Domino1,9550.17%
WinWebMail1,6930.15%
XMail1,4590.13%
Qmail Toaster1,0880.10%
SurgeSMTP8160.07%
Kerio7460.07%
Merak4620.04%
ArGoSoft3260.03%
OpenSMTPD2970.03%
MagicMail2490.02%
Post.Office2140.02%
GroupWise1840.02%
Gordano Messaging Suite (GMS)1730.02%
Trend Micro1090.01%
InterScan VirusWall590.01%
VisNetic410.00%
Mirapoint400.00%
Mercury190.00%
OpenVMS160.00%
WebSTAR V130.00%
Interscan120.00%
ModusMail110.00%
Neon Mail Server80.00%
MessageWall50.00%
NetIQ MailMarshal20.00%
WebSTAR10.00%
MAILsweeper10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (612,898 servers)

Version Number of Servers Percent
4.86362,47459.14%
4.8591,33614.90%
4.8462,44410.19%
4.7217,6062.87%
4.8016,5732.70%
4.8215,7472.57%
4.80.113,9212.27%
4.7613,4382.19%
Other19,3593.16%

Postfix (374,959 servers)

Version Number of Servers Percent
Other374,959100.00%

Sendmail (72,963 servers)

Version Number of Servers Percent
8.14.515,89821.79%
8.14.414,40919.75%
8.13.814,34619.66%
8.13.18,51411.67%
8.14.34,6856.42%
8.14.92,4303.33%
8.14.71,7092.34%
8.12.11.200603081,4952.05%
8.15.21,2221.67%
8.14.28721.20%
Other7,38310.12%

MailEnable (28,027 servers)

Version Number of Servers Percent
8.60--2,4868.87%
6.5--1,6996.06%
8.53--1,5735.61%
9.00--1,5255.44%
1.986--1,4695.24%
8.51--1,1003.92%
8.04--7922.83%
5.10--7842.80%
8.60-8.60-7162.55%
8.50--6462.30%
4.26--5942.12%
8.00--5622.01%
6.0--5271.88%
7.06--5191.85%
8.60--8.603711.32%
7.0--3481.24%
7.07--3391.21%
8.55--3361.20%
7.50--3261.16%
9.00--9.003231.15%
6.57--3131.12%
9.00-9.00-3071.10%
6.70--2911.04%
7.53--2811.00%
Other9,80034.97%

Microsoft (21,741 servers)

Version Number of Servers Percent
6.0.3790.467515,37070.70%
7.5.7601.175141,7418.01%
6.0.3790.39591,7398.00%
8.5.9600.163845622.58%
6.0.3790.18304812.21%
7.0.6002.182644021.85%
8.0.9200.163842801.29%
5.0.2195.73812521.16%
Other9144.20%

MDaemon (17,072 servers)

Version Number of Servers Percent
15.5.32,09512.27%
15.0.31,1626.81%
15.5.21,0256.00%
11.0.38094.74%
13.5.17454.36%
11.0.07324.29%
13.0.56783.97%
13.0.46653.90%
15.5.15112.99%
13.6.33862.26%
12.5.63812.23%
10.0.03482.04%
12.5.43151.85%
10.1.22961.73%
14.5.22791.63%
14.0.32461.44%
15.5.02431.42%
10.1.12391.40%
10.1.02151.26%
14.5.32131.25%
15.0.12021.18%
13.0.21861.09%
9.6.11801.05%
13.6.21791.05%
14.0.21791.05%
9.6.61711.00%
Other4,39225.73%

IMail (3,469 servers)

Version Number of Servers Percent
8.2235610.26%
12.5.3.932918.39%
12.4.2.272537.29%
12.4.1.152457.06%
9.232286.57%
12.5.4.1462226.40%
12.3.0.1002075.97%
8.151644.73%
8.051404.04%
12.2.0.2351073.08%
11.5982.83%
11.03972.80%
12.5.3.99812.33%
12.5.2.62762.19%
12.5.1.60671.93%
12.4.1.9551.59%
7.07551.59%
11.02521.50%
10.02491.41%
12.5.0.246481.38%
7.15461.33%
11.01461.33%
12.1.0.270441.27%
6.06371.07%
8.00351.01%
Other37010.67%

CommuniGate Pro (2,420 servers)

Version Number of Servers Percent
5.1.1624510.12%
6.1.61566.45%
6.0.111184.88%
6.1.71164.79%
6.0.91064.38%
6.1.8984.05%
6.1.5843.47%
5.4.11833.43%
5.2.20813.35%
6.1.2733.02%
6.0.10512.11%
5.2.3481.98%
4.1.8481.98%
5.3.13481.98%
5.3.15461.90%
5.0.14461.90%
6.0.7381.57%
6.1.4361.49%
6.0.5331.36%
5.2.16301.24%
6.0.8291.20%
5.4.8271.12%
Other78032.23%

Lotus Domino (1,955 servers)

Version Number of Servers Percent
8.5.3FP630815.75%
8.5.327013.81%
8.5.2944.81%
8.5.1753.84%
7.0.2653.32%
8.5643.27%
8.5.3FP3603.07%
8.5.2FP4572.92%
8.5.3FP2522.66%
8.5.2FP3492.51%
8.5.3FP4462.35%
8.5.2FP2432.20%
8.5.3FP1422.15%
8.5.3FP5422.15%
7.0.3402.05%
8.0.1351.79%
7.0321.64%
7.0.1311.59%
8.5.1FP5311.59%
8.0281.43%
6.5.1281.43%
8.5.2FP1231.18%
8.0.2231.18%
6.5.4221.13%
6.5211.07%
7.0.4201.02%
Other35418.11%

WinWebMail (1,693 servers)

Version Number of Servers Percent
3.9.0.732919.43%
3.8.1.327216.07%
3.7.6.11347.91%
3.9.0.11327.80%
3.8.0.11207.09%
3.8.1.5915.38%
3.8.1.1814.78%
3.7.3.1804.73%
3.8.5.1764.49%
3.7.7.3603.54%
3.8.6.1573.37%
3.7.1.1482.84%
3.8.2.1412.42%
3.8.3.1271.59%
3.7.5.1251.48%
3.9.0.5181.06%
3.7.0.5171.00%
Other855.02%

XMail (1,459 servers)

Version Number of Servers Percent
1.2757639.48%
1.2241928.72%
1.2515510.62%
1.261278.70%
1.24634.32%
1.21342.33%
1.23191.30%
1.20161.10%
Other503.43%

Qmail Toaster (1,088 servers)

Version Number of Servers Percent
1.31,01493.20%
1.2191.75%
1.03.5141.29%
1.03131.19%
1.5111.01%
Other171.56%

SurgeSMTP (816 servers)

Version Number of Servers Percent
6.9c-112114.83%
7.1e-112014.71%
6.5a2-29111.15%
6.7c-1627.60%
7.0c2-2597.23%
6.5a-1364.41%
6.3c2-2293.55%
3.9e-1212.57%
6.4a-1202.45%
5.2a-1172.08%
3.8k4-4161.96%
5.3h2-2141.72%
7.1f-9121.47%
6.1c-1101.23%
4.0u4-491.10%
Other17921.94%

Kerio (746 servers)

Version Number of Servers Percent
6.7.316021.45%
6.7.07510.05%
6.6.2628.31%
6.5.2537.10%
6.5.0476.30%
6.7.2435.76%
6.4.1425.63%
6.6.1374.96%
6.7.1324.29%
6.3.1314.16%
6.5.1273.62%
6.3.0202.68%
6.4.0182.41%
6.4.2131.74%
6.6.0121.61%
6.1.391.21%
6.2.081.07%
Other577.64%

Merak (462 servers)

Version Number of Servers Percent
8.0.314431.17%
8.9.16614.29%
8.5.0347.36%
8.3.8286.06%
7.5.2245.19%
7.4.5234.98%
7.6.4173.68%
7.0.1132.81%
7.6.1122.60%
8.3.15102.16%
7.4.281.73%
7.2.081.73%
8.9.071.52%
6.1.051.08%
6.2.151.08%
6.0.851.08%
Other5311.47%

ArGoSoft (326 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)10331.60%
1.8 (1.8.9.5)4112.58%
1.8 (1.8.9.3)3510.74%
1.8 (1.8.9.1)3410.43%
1.8 (1.8.8.7)164.91%
1.8 (1.8.8.8)164.91%
1.8 (1.8.9.2)103.07%
1.8 (1.8.7.3)72.15%
1.8 (1.8.6.0)61.84%
1.8 (1.8.9.4)61.84%
1.8 (1.8.8.9)41.23%
1.8 (1.8.8.2)41.23%
Other4413.50%

OpenSMTPD (297 servers)

Version Number of Servers Percent
Other297100.00%

MagicMail (249 servers)

Version Number of Servers Percent
Other249100.00%

Post.Office (214 servers)

Version Number of Servers Percent
4.2.24621.50%
3.5.32813.08%
4.1.2.42511.68%
4.32210.28%
4.2.1.394.21%
4.1.183.74%
4.1.0.273.27%
4.0.173.27%
4.2.1.173.27%
3.9.2.362.80%
3.1.2J62.80%
3.5.3J41.87%
4.241.87%
3.1.231.40%
4.1.2.331.40%
3.9.231.40%
3.5.131.40%
3.8.7.431.40%
Other209.35%

GroupWise (184 servers)

Version Number of Servers Percent
14.0.22111.41%
14.0.11910.33%
8.0.3189.78%
6.5.7179.24%
7.0.3147.61%
14.2.0147.61%
14.0.0115.98%
8.0.2105.43%
7.0.294.89%
7.0.494.89%
7.0.152.72%
6.5.642.17%
6.0.442.17%
12.0.131.63%
12.0.231.63%
6.0.331.63%
8.0.021.09%
8.0.121.09%
6.5.421.09%
6.5.521.09%
12.0.321.09%
12.0.421.09%
12.0.021.09%
6.0.221.09%
Other42.17%

Gordano Messaging Suite (GMS) (173 servers)

Version Number of Servers Percent
Other173100.00%

Trend Micro (109 servers)

Version Number of Servers Percent
5.74339.45%
5.52119.27%
5.181917.43%
7.0109.17%
7.154.59%
8.532.75%
3.5332.75%
7.521.83%
Other32.75%

InterScan VirusWall (59 servers)

Version Number of Servers Percent
Other59100.00%

VisNetic (41 servers)

Version Number of Servers Percent
9.3.2.01024.39%
9.1.4.1512.20%
6.2.2.037.32%
5.0.2.337.32%
8.5.0.837.32%
5.8.6.624.88%
7.6.1.024.88%
5.5.8.324.88%
5.3.5.024.88%
8.0.312.44%
8.3.0.112.44%
8.5.0.512.44%
5.4.5.412.44%
9.1.4.012.44%
5.0.2.012.44%
7.2.4.012.44%
9.1.4.1 provided by Techfount Systems Pte Ltd12.44%
7.2.4.112.44%
Other00.00%

Mirapoint (40 servers)

Version Number of Servers Percent
4.4.3-GA717.50%
4.3.6-GA512.50%
4.4.5-GA410.00%
4.3.5-GA410.00%
4.4.2a-FCS410.00%
4.3.3-GA25.00%
4.4.4-GA25.00%
4.1.10-GA25.00%
4.4.7-GA25.00%
4.1.9-GA12.50%
4.4.5a-GA12.50%
3.10.10a-GA12.50%
4.1.6-GA12.50%
3.7.5a-GA12.50%
3.8.4-GA12.50%
3.10.2-GA12.50%
4.4.6-GA12.50%
Other00.00%

Mercury (19 servers)

Version Number of Servers Percent
3.321052.63%
1.48736.84%
3.2115.26%
4.x15.26%
Other00.00%

OpenVMS (16 servers)

Version Number of Servers Percent
7.3637.50%
8.4531.25%
8.3531.25%
Other00.00%

WebSTAR V (13 servers)

Version Number of Servers Percent
5.4.1646.15%
5.4.0430.77%
5.3.317.69%
5.3.417.69%
5.3.217.69%
Other00.00%

Interscan (12 servers)

Version Number of Servers Percent
3.55 (build 1016)325.00%
3.81-Build_1084216.67%
3.81-Build_1022216.67%
3.5 (build 1294)18.33%
3.8-Build_301318.33%
3.53 (build 2013)18.33%
3.55 (build 1029)18.33%
3.8-Build_108018.33%
Other00.00%

ModusMail (11 servers)

Version Number of Servers Percent
4.35.477.0654.55%
4.1.361.21218.18%
3.2.315.019.09%
4.35.477.819.09%
3.1.302.019.09%
Other00.00%

Neon Mail Server (8 servers)

Version Number of Servers Percent
3.0.7337.50%
3.1.0225.00%
3.1.4112.50%
3.1.2112.50%
3.0.8112.50%
Other00.00%

MessageWall (5 servers)

Version Number of Servers Percent
1.0.85100.00%
Other00.00%

NetIQ MailMarshal (2 servers)

Version Number of Servers Percent
5.5.6.5150.00%
5.5.6.7150.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

MAILsweeper (1 servers)

Version Number of Servers Percent
4.3.20.01100.00%
Other00.00%



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