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Mail (MX) Server Survey
March 1st, 2014

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 Queried2,453,178   100.0%
Number of Servers that didn't respond432,97117.65%
    Server didn't open socket422,93617.24%
    Server didn't provide banner10,0350.41%
Server provided banner2,020,20782.35%
Server banner identifies software in use1,133,85546.22%

As indicated by the above table, of the 2,453,178 servers queried, only 1,133,855 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
Exim575,56550.76%
Postfix321,90128.39%
Sendmail102,6309.05%
Microsoft59,0465.21%
MailEnable31,8732.81%
MDaemon19,5811.73%
IMail5,6350.50%
Lotus Domino3,4450.30%
CommuniGate Pro2,8790.25%
WinWebMail2,5470.22%
XMail1,8750.17%
Qmail Toaster1,4310.13%
Kerio1,1790.10%
SurgeSMTP9810.09%
Merak8960.08%
ArGoSoft5150.05%
Post.Office2970.03%
GroupWise2950.03%
MagicMail2940.03%
Gordano Messaging Suite (GMS)2660.02%
Trend Micro2300.02%
InterScan VirusWall980.01%
Mirapoint830.01%
OpenSMTPD780.01%
VisNetic700.01%
Mercury320.00%
Interscan250.00%
WebSTAR V240.00%
OpenVMS230.00%
NetIQ MailMarshal180.00%
Neon Mail Server120.00%
MessageWall100.00%
ModusMail100.00%
WebSTAR80.00%
MAILsweeper30.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (575,565 servers)

Version Number of Servers Percent
4.82275,49847.87%
4.80.1118,03020.51%
4.80103,69418.02%
4.7218,4403.20%
4.7617,7743.09%
4.6913,9052.42%
4.7710,8491.88%
Other17,3753.02%

Postfix (321,901 servers)

Version Number of Servers Percent
Other321,901100.00%

Sendmail (102,630 servers)

Version Number of Servers Percent
8.13.825,39624.75%
8.14.515,44715.05%
8.14.414,56814.19%
8.13.113,93713.58%
8.14.311,78711.48%
8.12.11.200603083,3003.22%
8.13.6.200606142,8122.74%
8.14.21,9421.89%
8.14.71,9021.85%
8.11.61,5061.47%
8.12.101,2881.25%
8.14.11,2101.18%
8.13.61,0311.00%
Other6,5046.34%

Microsoft (59,046 servers)

Version Number of Servers Percent
6.0.3790.467547,10979.78%
6.0.3790.39595,4309.20%
7.5.7601.175142,2603.83%
6.0.3790.18301,4382.44%
Other2,8094.76%

MailEnable (31,873 servers)

Version Number of Servers Percent
1.986--3,82111.99%
6.5--2,4897.81%
5.10--1,7925.62%
4.26--1,3154.13%
6.0--1,2173.82%
7.06--8352.62%
8.00--7292.29%
1.981--7252.27%
7.07--6362.00%
7.50--6171.94%
7.0--5771.81%
7.53--5561.74%
6.57--5311.67%
6.70--5121.61%
6.03--4591.44%
7.55--4451.40%
3.62--3941.24%
1.983--3551.11%
8.00-8.00-3511.10%
0-3.65-3311.04%
Other13,18641.37%

MDaemon (19,581 servers)

Version Number of Servers Percent
13.6.21,5557.94%
11.0.31,3306.79%
13.6.11,2476.37%
13.6.01,1465.85%
11.0.01,1015.62%
13.0.41,0855.54%
13.0.59815.01%
13.5.28944.57%
13.5.16033.08%
10.0.06013.07%
12.5.65772.95%
13.0.35232.67%
10.1.24892.50%
10.1.14332.21%
12.5.43571.82%
13.0.23541.81%
9.6.13501.79%
10.1.03181.62%
9.6.63141.60%
9.6.22531.29%
9.5.22161.10%
10.0.21961.00%
Other4,65823.79%

IMail (5,635 servers)

Version Number of Servers Percent
12.3.0.10094716.81%
8.2283414.80%
12.2.0.23563311.23%
11.53916.94%
9.233305.86%
8.153155.59%
8.052364.19%
11.032033.60%
10.021703.02%
12.1.0.2701402.48%
11.021262.24%
11.011242.20%
7.071192.11%
7.151051.86%
6.061021.81%
12.2.0.1691021.81%
8.00741.31%
Other68412.14%

Lotus Domino (3,445 servers)

Version Number of Servers Percent
8.5.356316.34%
8.5.3FP32005.81%
8.5.21875.43%
8.5.3FP21524.41%
8.5.11484.30%
8.5.3FP41484.30%
7.0.21273.69%
8.5.2FP21243.60%
8.5.3FP51143.31%
8.51053.05%
8.5.3FP6982.84%
8.5.3FP1972.82%
8.5.2FP3912.64%
8.5.2FP4802.32%
7.0.3712.06%
8.5.1FP5661.92%
7.0531.54%
8.0.1521.51%
8.5.2FP1521.51%
8.0.2511.48%
6.5.3511.48%
6.5.4491.42%
6.5.1491.42%
7.0.1461.34%
8.0391.13%
6.5.5371.07%
6.5361.04%
Other55916.23%

CommuniGate Pro (2,879 servers)

Version Number of Servers Percent
5.1.162799.69%
6.0.71986.88%
6.0.81615.59%
6.0.51274.41%
5.2.201033.58%
4.1.81013.51%
5.3.13632.19%
5.3.15622.15%
5.4.8582.01%
5.4.6582.01%
5.0.14582.01%
4.2.10571.98%
6.0.6541.88%
5.4.10531.84%
5.4.11531.84%
5.4.4531.84%
5.1.12521.81%
5.2.19501.74%
5.2.3451.56%
5.4.1441.53%
6.0.1441.53%
5.2.16431.49%
5.4.5391.35%
6.0.4381.32%
5.4.0341.18%
5.2.14311.08%
Other92131.99%

WinWebMail (2,547 servers)

Version Number of Servers Percent
3.8.1.344917.63%
3.8.0.126210.29%
3.7.6.12399.38%
3.8.6.12078.13%
3.8.5.11817.11%
3.8.1.51817.11%
3.8.1.11696.64%
3.7.3.11415.54%
3.7.7.31264.95%
3.8.2.11094.28%
3.7.1.1873.42%
3.9.0.1823.22%
3.7.5.1602.36%
3.8.3.1491.92%
3.8.3.3451.77%
3.6.3.1301.18%
3.7.0.5291.14%
3.7.0.3271.06%
Other742.91%

XMail (1,875 servers)

Version Number of Servers Percent
1.2761732.91%
1.2248525.87%
1.2527314.56%
1.261839.76%
1.241166.19%
1.21542.88%
1.23271.44%
1.17251.33%
1.20191.01%
Other764.05%

Qmail Toaster (1,431 servers)

Version Number of Servers Percent
1.31,35794.83%
1.2392.73%
Other352.45%

Kerio (1,179 servers)

Version Number of Servers Percent
6.7.321418.15%
6.7.012310.43%
6.6.21119.41%
6.5.0897.55%
6.5.2806.79%
6.7.2716.02%
6.4.1625.26%
6.3.1564.75%
6.7.1534.50%
6.6.1484.07%
6.4.0443.73%
6.5.1383.22%
6.3.0282.37%
6.4.2262.21%
6.6.0201.70%
6.0.10161.36%
6.2.0121.02%
Other887.46%

SurgeSMTP (981 servers)

Version Number of Servers Percent
6.5a-125726.20%
6.3c2-212012.23%
6.4a-111211.42%
5.2a-1525.30%
5.3h2-2474.79%
6.1c-1414.18%
3.9e-1353.57%
6.0a5-5222.24%
3.8k4-4161.63%
6.5b-55161.63%
4.0u4-4151.53%
5.0e4-4121.22%
6.0a4-4121.22%
4.2d2-2121.22%
3.9h-18111.12%
3.8i3-3101.02%
4.2d4-4101.02%
Other18118.45%

Merak (896 servers)

Version Number of Servers Percent
8.0.333837.72%
8.9.110812.05%
8.5.0616.81%
8.3.8485.36%
7.5.2455.02%
7.6.4414.58%
7.4.5333.68%
7.6.1161.79%
7.2.0141.56%
7.0.1141.56%
9.0.0131.45%
8.3.15121.34%
8.9.0111.23%
7.4.2101.12%
8.2.491.00%
6.2.191.00%
Other11412.72%

ArGoSoft (515 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)13325.83%
1.8 (1.8.9.5)7113.79%
1.8 (1.8.9.3)6212.04%
1.8 (1.8.9.1)5610.87%
1.8 (1.8.8.8)336.41%
1.8 (1.8.8.7)316.02%
1.8 (1.8.9.2)214.08%
1.8 (1.8.9.4)142.72%
1.8 (1.8.6.0)112.14%
1.8 (1.8.8.9)91.75%
1.8 (1.8.8.1)61.17%
Other6813.20%

Post.Office (297 servers)

Version Number of Servers Percent
3.5.34113.80%
4.1.2.43411.45%
4.1.0.2227.41%
4.2.2227.41%
4.1.1175.72%
4.0.1175.72%
3.5.3J124.04%
4.2113.70%
3.9.2.3113.70%
4.1.0.382.69%
4.1.0.472.36%
3.1.2J62.02%
4.2.1.362.02%
3.8.351.68%
3.1.251.68%
4.1.2.351.68%
3.9.1.251.68%
3.9.151.68%
3.5.441.35%
3.9.1.341.35%
3.9.241.35%
3.9.2.241.35%
3.5.141.35%
4.1.2.231.01%
4.131.01%
4.2.1.131.01%
4.0.1.131.01%
3.8.7.431.01%
3.9.2.131.01%
4.0.0.131.01%
4.2.1.231.01%
Other144.71%

GroupWise (295 servers)

Version Number of Servers Percent
7.0.34916.61%
8.0.23913.22%
6.5.73511.86%
7.0.4258.47%
7.0.2217.12%
8.0.3217.12%
12.0.2175.76%
6.5.6134.41%
6.5.4124.07%
8.0.182.71%
7.0.182.71%
6.0.472.37%
8.0.062.03%
12.0.151.69%
6.5.541.36%
7.031.02%
6.0.131.02%
12.0.031.02%
6.5.231.02%
6.5.131.02%
Other103.39%

MagicMail (294 servers)

Version Number of Servers Percent
Other294100.00%

Gordano Messaging Suite (GMS) (266 servers)

Version Number of Servers Percent
Other266100.00%

Trend Micro (230 servers)

Version Number of Servers Percent
5.79340.43%
5.54620.00%
5.183615.65%
7.02310.00%
7.1156.52%
3.5331.30%
8.531.30%
Other114.78%

InterScan VirusWall (98 servers)

Version Number of Servers Percent
Other98100.00%

Mirapoint (83 servers)

Version Number of Servers Percent
4.3.5-GA1214.46%
4.4.3-GA910.84%
4.3.6-GA89.64%
4.2.3-GA67.23%
3.10.10a-GA56.02%
4.4.4-GA56.02%
4.1.9-GA44.82%
4.4.2a-FCS44.82%
4.1.10-GA44.82%
4.1.5-GA33.61%
4.3.3-GA22.41%
3.8.3-GA22.41%
4.1.3-GA22.41%
4.2.4-GA22.41%
3.8.5-GA22.41%
4.3.7-GA22.41%
3.10.2-GA11.20%
3.8.4-GA11.20%
3.7.3a-GA11.20%
4.1.6-GA11.20%
3.8.7a11.20%
4.1.4-GA11.20%
3.10.7-GA11.20%
3.7.5a-GA11.20%
3.3.3-GR11.20%
3.8.2-GA11.20%
4.1.8-GA11.20%
Other00.00%

OpenSMTPD (78 servers)

Version Number of Servers Percent
Other78100.00%

VisNetic (70 servers)

Version Number of Servers Percent
9.3.2.01622.86%
9.1.4.168.57%
8.0.3.157.14%
8.5.0.845.71%
5.5.8.345.71%
6.2.2.034.29%
5.0.2.334.29%
7.2.4.134.29%
9.1.4.034.29%
5.8.6.622.86%
5.4.5.422.86%
7.6.1.022.86%
5.8.6.422.86%
8.0.322.86%
5.0.2.022.86%
5.3.5.022.86%
8.5.0.511.43%
8.3.0.011.43%
8.3.0.111.43%
8.0.3.011.43%
8.3.5.011.43%
9.1.4.1 da-lax-msg mail.davidco.com11.43%
6.0.9.011.43%
7.5.3.011.43%
9.1.4.1 provided by Techfount Systems Pte Ltd11.43%
Other00.00%

Mercury (32 servers)

Version Number of Servers Percent
1.481753.12%
3.321134.38%
3.21c26.25%
3.2113.12%
4.x13.12%
Other00.00%

Interscan (25 servers)

Version Number of Servers Percent
3.81-Build_1022520.00%
3.55 (build 1016)416.00%
3.81-Build_1084312.00%
3.8-Build_301328.00%
3.55 (build 1029)28.00%
3.53 (build 1493)28.00%
3.5 (build 1294)14.00%
3.53 (build 2011)14.00%
3.55 (build 1020)14.00%
3.53 (build 2013)14.00%
3.53 (build 2017)14.00%
3.8-Build_304514.00%
3.8-Build_108014.00%
Other00.00%

WebSTAR V (24 servers)

Version Number of Servers Percent
5.4.11354.17%
5.4.0520.83%
5.3.4312.50%
5.3.228.33%
5.3.314.17%
Other00.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.31043.48%
8.4730.43%
7.3521.74%
8.214.35%
Other00.00%

NetIQ MailMarshal (18 servers)

Version Number of Servers Percent
6.0.3.81161.11%
5.5.6.5211.11%
5.5.6.6211.11%
5.5.5.615.56%
5.5.4.1715.56%
5.5.6.715.56%
Other00.00%

Neon Mail Server (12 servers)

Version Number of Servers Percent
3.0.7433.33%
3.1.4216.67%
3.1.2216.67%
3.1.318.33%
3.1.018.33%
3.0.618.33%
3.0.918.33%
Other00.00%

MessageWall (10 servers)

Version Number of Servers Percent
1.0.8990.00%
1.0.6110.00%
Other00.00%

ModusMail (10 servers)

Version Number of Servers Percent
4.35.477.0660.00%
4.1.361.21110.00%
3.2.315.0110.00%
4.35.477.8110.00%
3.1.302.0110.00%
Other00.00%

WebSTAR (8 servers)

Version Number of Servers Percent
Other8100.00%

MAILsweeper (3 servers)

Version Number of Servers Percent
4.3.17.0266.67%
4.3.20.0133.33%
Other00.00%




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