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Mail (MX) Server Survey
March 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 Queried2,302,619   100.0%
Number of Servers that didn't respond404,86017.58%
    Server didn't open socket396,06017.20%
    Server didn't provide banner8,8000.38%
Server provided banner1,897,75982.42%
Server banner identifies software in use1,130,42949.09%

As indicated by the above table, of the 2,302,619 servers queried, only 1,130,429 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
Exim611,86954.13%
Postfix368,63932.61%
Sendmail69,7806.17%
MailEnable27,8022.46%
Microsoft20,6891.83%
MDaemon16,3761.45%
IMail3,4230.30%
CommuniGate Pro2,2280.20%
Lotus Domino1,8590.16%
WinWebMail1,6140.14%
XMail1,3900.12%
Qmail Toaster1,0610.09%
SurgeSMTP8190.07%
Kerio7030.06%
Merak4530.04%
ArGoSoft3140.03%
OpenSMTPD2970.03%
MagicMail2430.02%
Post.Office2050.02%
GroupWise1750.02%
Gordano Messaging Suite (GMS)1730.02%
Trend Micro1040.01%
InterScan VirusWall550.00%
Mirapoint390.00%
VisNetic380.00%
OpenVMS150.00%
WebSTAR V130.00%
Mercury130.00%
Interscan110.00%
ModusMail110.00%
Neon Mail Server80.00%
MessageWall50.00%
NetIQ MailMarshal20.00%
WebSTAR20.00%
MAILsweeper10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (611,869 servers)

Version Number of Servers Percent
4.86418,03268.32%
4.8461,27410.01%
4.8542,5336.95%
4.7217,4362.85%
4.8015,8292.59%
4.7612,9392.11%
4.8212,5992.06%
4.80.112,5072.04%
Other18,7203.06%

Postfix (368,639 servers)

Version Number of Servers Percent
Other368,639100.00%

Sendmail (69,780 servers)

Version Number of Servers Percent
8.14.515,39022.06%
8.14.413,88119.89%
8.13.813,64119.55%
8.13.18,21611.77%
8.14.34,3156.18%
8.14.92,5033.59%
8.14.71,5672.25%
8.12.11.200603081,4282.05%
8.15.21,1871.70%
8.14.27991.15%
Other6,8539.82%

MailEnable (27,802 servers)

Version Number of Servers Percent
8.60--2,4198.70%
9.00--1,6916.08%
6.5--1,6696.00%
8.53--1,5595.61%
1.986--1,4315.15%
8.51--1,0923.93%
8.04--7722.78%
5.10--7542.71%
8.60-8.60-6812.45%
8.50--6372.29%
4.26--5732.06%
8.00--5351.92%
6.0--5091.83%
7.06--5041.81%
7.0--3411.23%
8.60--8.603311.19%
7.07--3261.17%
8.55--3241.17%
7.50--3181.14%
6.57--3141.13%
6.70--2871.03%
7.53--2811.01%
Other10,45437.60%

Microsoft (20,689 servers)

Version Number of Servers Percent
6.0.3790.467514,53970.27%
7.5.7601.175141,6718.08%
6.0.3790.39591,6547.99%
8.5.9600.163845632.72%
6.0.3790.18304512.18%
7.0.6002.182643951.91%
8.0.9200.163842741.32%
5.0.2195.73812451.18%
Other8974.34%

MDaemon (16,376 servers)

Version Number of Servers Percent
15.5.32,46415.05%
15.0.31,0626.49%
15.5.28415.14%
11.0.37554.61%
13.5.17064.31%
11.0.06944.24%
13.0.46383.90%
13.0.56183.77%
15.5.14442.71%
13.6.33832.34%
12.5.63622.21%
10.0.03261.99%
12.5.43061.87%
10.1.22811.72%
14.5.22651.62%
14.0.32291.40%
10.1.12261.38%
15.5.02101.28%
10.1.02081.27%
14.5.32011.23%
15.0.11771.08%
13.6.21741.06%
13.0.21721.05%
9.6.11691.03%
14.0.21681.03%
9.6.61671.02%
Other4,13025.22%

IMail (3,423 servers)

Version Number of Servers Percent
8.223409.93%
12.5.3.933038.85%
12.5.4.1462627.65%
12.4.2.272527.36%
12.4.1.152427.07%
9.232226.49%
12.3.0.1002015.87%
8.151654.82%
8.051424.15%
12.2.0.2351053.07%
11.03922.69%
11.5912.66%
12.5.3.99782.28%
12.5.1.60641.87%
12.5.2.62561.64%
7.07521.52%
12.4.1.9521.52%
10.02501.46%
11.02491.43%
12.5.0.246481.40%
7.15441.29%
12.1.0.270431.26%
11.01411.20%
6.06351.02%
Other39411.51%

CommuniGate Pro (2,228 servers)

Version Number of Servers Percent
5.1.1623810.68%
6.1.81315.88%
6.0.111155.16%
6.1.71024.58%
6.0.9964.31%
5.4.11813.64%
6.1.5763.41%
5.2.20753.37%
6.1.2713.19%
6.1.6612.74%
6.0.10472.11%
5.3.13472.11%
4.1.8462.06%
5.3.15452.02%
5.2.3452.02%
5.0.14431.93%
6.0.7391.75%
6.1.4371.66%
5.2.16291.30%
6.0.5291.30%
6.0.8281.26%
5.4.8271.21%
5.1.12241.08%
Other69631.24%

Lotus Domino (1,859 servers)

Version Number of Servers Percent
8.5.3FP630316.30%
8.5.326314.15%
8.5.2884.73%
8.5.1703.77%
7.0.2633.39%
8.5.3FP3563.01%
8.5552.96%
8.5.2FP4532.85%
8.5.3FP2522.80%
8.5.2FP3482.58%
8.5.3FP4442.37%
8.5.2FP2402.15%
7.0.3402.15%
8.5.3FP5402.15%
8.5.3FP1392.10%
7.0.1321.72%
8.0.1311.67%
8.0291.56%
8.5.1FP5291.56%
7.0291.56%
6.5.1271.45%
8.5.2FP1221.18%
8.0.2211.13%
6.5.3211.13%
6.5191.02%
Other34518.56%

WinWebMail (1,614 servers)

Version Number of Servers Percent
3.9.0.733120.51%
3.8.1.326516.42%
3.7.6.11267.81%
3.9.0.11237.62%
3.8.0.11106.82%
3.8.1.5875.39%
3.8.1.1764.71%
3.7.3.1724.46%
3.8.5.1724.46%
3.8.6.1563.47%
3.7.7.3553.41%
3.7.1.1462.85%
3.8.2.1392.42%
3.8.3.1241.49%
3.7.5.1201.24%
3.8.3.3181.12%
3.9.0.5171.05%
3.7.0.5171.05%
Other603.72%

XMail (1,390 servers)

Version Number of Servers Percent
1.2757141.08%
1.2238427.63%
1.2514710.58%
1.261178.42%
1.24614.39%
1.21322.30%
1.23161.15%
1.20151.08%
Other473.38%

Qmail Toaster (1,061 servers)

Version Number of Servers Percent
1.398893.12%
1.2181.70%
1.03141.32%
1.03.5141.32%
Other272.54%

SurgeSMTP (819 servers)

Version Number of Servers Percent
7.1e-116319.90%
6.9c-111313.80%
6.5a2-28810.74%
6.7c-1587.08%
7.0c2-2485.86%
6.5a-1334.03%
6.3c2-2283.42%
3.9e-1222.69%
6.4a-1202.44%
5.2a-1172.08%
3.8k4-4161.95%
5.3h2-2131.59%
7.1f-9111.34%
6.1c-1101.22%
Other17921.86%

Kerio (703 servers)

Version Number of Servers Percent
6.7.314921.19%
6.7.07710.95%
6.6.2598.39%
6.5.2517.25%
6.5.0486.83%
6.7.2405.69%
6.4.1354.98%
6.6.1314.41%
6.7.1294.13%
6.3.1273.84%
6.5.1253.56%
6.3.0192.70%
6.4.0162.28%
6.4.2121.71%
6.6.0111.56%
6.1.391.28%
6.2.081.14%
5.7.981.14%
Other496.97%

Merak (453 servers)

Version Number of Servers Percent
8.0.314732.45%
8.9.16514.35%
8.5.0337.28%
8.3.8275.96%
7.5.2235.08%
7.4.5224.86%
7.6.4153.31%
7.0.1132.87%
7.6.1132.87%
8.3.15102.21%
7.2.081.77%
7.4.271.55%
8.9.061.32%
6.1.051.10%
6.0.851.10%
Other5411.92%

ArGoSoft (314 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)10232.48%
1.8 (1.8.9.5)3711.78%
1.8 (1.8.9.3)3511.15%
1.8 (1.8.9.1)3310.51%
1.8 (1.8.8.7)154.78%
1.8 (1.8.8.8)154.78%
1.8 (1.8.9.2)103.18%
1.8 (1.8.6.0)72.23%
1.8 (1.8.7.3)61.91%
1.8 (1.8.9.4)61.91%
1.8 (1.8.8.2)41.27%
1.8 (1.8.8.9)41.27%
Other4012.74%

OpenSMTPD (297 servers)

Version Number of Servers Percent
Other297100.00%

MagicMail (243 servers)

Version Number of Servers Percent
Other243100.00%

Post.Office (205 servers)

Version Number of Servers Percent
4.2.24521.95%
3.5.32813.66%
4.1.2.42512.20%
4.3209.76%
4.2.1.394.39%
4.1.0.273.41%
3.9.2.362.93%
4.0.162.93%
3.1.2J62.93%
4.1.162.93%
4.2.1.152.44%
3.5.3J41.95%
4.241.95%
3.1.231.46%
4.1.2.331.46%
3.9.231.46%
3.5.131.46%
Other2210.73%

GroupWise (175 servers)

Version Number of Servers Percent
14.0.22212.57%
14.0.11910.86%
8.0.31910.86%
14.2.01810.29%
6.5.7158.57%
7.0.3148.00%
14.0.0116.29%
8.0.284.57%
7.0.274.00%
7.0.463.43%
6.0.442.29%
7.0.131.71%
6.5.631.71%
6.0.331.71%
12.0.231.71%
6.5.431.71%
8.0.121.14%
12.0.421.14%
12.0.121.14%
12.0.321.14%
12.0.021.14%
6.0.221.14%
Other52.86%

Gordano Messaging Suite (GMS) (173 servers)

Version Number of Servers Percent
Other173100.00%

Trend Micro (104 servers)

Version Number of Servers Percent
5.74341.35%
5.51918.27%
5.181817.31%
7.087.69%
7.143.85%
8.532.88%
3.5332.88%
7.521.92%
Other43.85%

InterScan VirusWall (55 servers)

Version Number of Servers Percent
Other55100.00%

Mirapoint (39 servers)

Version Number of Servers Percent
4.4.3-GA717.95%
4.3.6-GA512.82%
4.4.2a-FCS410.26%
4.4.5-GA410.26%
4.3.5-GA37.69%
4.4.7-GA25.13%
4.1.10-GA25.13%
4.4.4-GA25.13%
3.10.10a-GA25.13%
4.3.3-GA25.13%
4.4.5a-GA12.56%
3.7.5a-GA12.56%
4.1.9-GA12.56%
3.8.4-GA12.56%
3.10.2-GA12.56%
4.4.6-GA12.56%
Other00.00%

VisNetic (38 servers)

Version Number of Servers Percent
9.3.2.0923.68%
9.1.4.1410.53%
5.0.2.337.89%
8.5.0.837.89%
6.2.2.037.89%
5.3.5.025.26%
5.5.8.325.26%
7.6.1.025.26%
8.5.0.512.63%
5.4.5.412.63%
5.8.6.612.63%
8.0.3.112.63%
9.1.4.012.63%
5.0.2.012.63%
7.2.4.012.63%
9.1.4.1 provided by Techfount Systems Pte Ltd12.63%
8.3.0.112.63%
7.2.4.112.63%
Other00.00%

OpenVMS (15 servers)

Version Number of Servers Percent
8.4533.33%
8.3533.33%
7.3533.33%
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%

Mercury (13 servers)

Version Number of Servers Percent
3.32753.85%
1.48430.77%
3.2117.69%
4.x17.69%
Other00.00%

Interscan (11 servers)

Version Number of Servers Percent
3.55 (build 1016)327.27%
3.81-Build_1084218.18%
3.5 (build 1294)19.09%
3.8-Build_301319.09%
3.81-Build_102219.09%
3.53 (build 2013)19.09%
3.55 (build 1029)19.09%
3.8-Build_108019.09%
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%
3.1.2225.00%
3.1.0225.00%
3.1.4112.50%
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 (2 servers)

Version Number of Servers Percent
Other2100.00%

MAILsweeper (1 servers)

Version Number of Servers Percent
4.3.20.01100.00%
Other00.00%




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