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Mail (MX) Server Survey
July 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 Queried2,492,485   100.0%
Number of Servers that didn't respond459,71318.44%
    Server didn't open socket449,43518.03%
    Server didn't provide banner10,2780.41%
Server provided banner2,032,77281.56%
Server banner identifies software in use1,140,30045.75%

As indicated by the above table, of the 2,492,485 servers queried, only 1,140,300 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
Exim583,37251.16%
Postfix336,40829.50%
Sendmail98,0858.60%
Microsoft49,5124.34%
MailEnable31,4622.76%
MDaemon19,4431.71%
IMail5,1640.45%
Lotus Domino3,1880.28%
CommuniGate Pro2,8240.25%
WinWebMail2,4550.22%
XMail1,8200.16%
Qmail Toaster1,4100.12%
Kerio1,0810.09%
SurgeSMTP9810.09%
Merak7960.07%
ArGoSoft4880.04%
MagicMail3030.03%
Post.Office2890.03%
GroupWise2660.02%
Gordano Messaging Suite (GMS)2530.02%
Trend Micro2060.02%
OpenSMTPD1100.01%
InterScan VirusWall890.01%
Mirapoint740.01%
VisNetic660.01%
Mercury290.00%
Interscan240.00%
OpenVMS230.00%
WebSTAR V200.00%
NetIQ MailMarshal170.00%
Neon Mail Server150.00%
ModusMail100.00%
MessageWall80.00%
WebSTAR50.00%
MAILsweeper40.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (583,372 servers)

Version Number of Servers Percent
4.82415,82171.28%
4.80.166,58811.41%
4.8027,0354.63%
4.7618,8383.23%
4.7216,7512.87%
4.6911,2331.93%
4.778,2271.41%
Other18,8793.24%

Postfix (336,408 servers)

Version Number of Servers Percent
Other336,408100.00%

Sendmail (98,085 servers)

Version Number of Servers Percent
8.13.822,99123.44%
8.14.519,36019.74%
8.14.414,70614.99%
8.13.112,92413.18%
8.14.37,7817.93%
8.12.11.200603082,9883.05%
8.13.6.200606142,5962.65%
8.14.71,7291.76%
8.14.21,5071.54%
8.11.61,3571.38%
8.12.101,2071.23%
8.14.11,0811.10%
8.13.69831.00%
Other6,8757.01%

Microsoft (49,512 servers)

Version Number of Servers Percent
6.0.3790.467538,87878.52%
6.0.3790.39594,3888.86%
7.5.7601.175142,2834.61%
6.0.3790.18301,1782.38%
5.0.2195.73815021.01%
Other2,2834.61%

MailEnable (31,462 servers)

Version Number of Servers Percent
1.986--3,21410.22%
6.5--2,4047.64%
5.10--1,5354.88%
4.26--1,1453.64%
6.0--1,1373.61%
8.04--9132.90%
8.00--9042.87%
7.06--8632.74%
8.50--6942.21%
1.981--6191.97%
7.50--5841.86%
7.07--5471.74%
7.0--5231.66%
6.57--5171.64%
7.53--5061.61%
6.70--4771.52%
6.03--4021.28%
3.62--3161.00%
Other14,16245.01%

MDaemon (19,443 servers)

Version Number of Servers Percent
14.0.22,98015.33%
11.0.31,2226.29%
11.0.01,0435.36%
13.0.49815.05%
13.0.58414.33%
14.0.08214.22%
13.6.27623.92%
13.5.15953.06%
12.5.65382.77%
10.0.05292.72%
13.6.04882.51%
10.1.24512.32%
13.5.24232.18%
10.1.13771.94%
13.6.13571.84%
13.0.33521.81%
12.5.43511.81%
10.1.03071.58%
9.6.13041.56%
13.0.22931.51%
9.6.62761.42%
9.6.22551.31%
9.5.21951.00%
Other4,70224.18%

IMail (5,164 servers)

Version Number of Servers Percent
12.3.0.10072414.02%
8.2259811.58%
12.2.0.2354769.22%
11.53667.09%
9.233106.00%
8.152815.44%
8.052234.32%
12.4.0.1662144.14%
11.011643.18%
11.031633.16%
12.4.1.91482.87%
12.1.0.2701402.71%
10.021312.54%
11.021132.19%
12.4.1.151042.01%
6.06971.88%
7.15941.82%
7.07731.41%
12.2.0.169601.16%
8.00601.16%
10.01581.12%
Other56710.98%

Lotus Domino (3,188 servers)

Version Number of Servers Percent
8.5.351316.09%
8.5.21765.52%
8.5.3FP61705.33%
8.5.3FP31615.05%
8.5.11304.08%
8.5.3FP21263.95%
8.5.3FP41253.92%
7.0.21163.64%
8.5.3FP51033.23%
8.5.2FP21003.14%
8.5983.07%
8.5.3FP1902.82%
8.5.2FP3862.70%
8.5.2FP4792.48%
7.0.3682.13%
8.5.1FP5541.69%
8.0.2521.63%
7.0521.63%
7.0.1471.47%
6.5.3451.41%
6.5.4441.38%
8.0.1441.38%
6.5.1411.29%
8.0401.25%
8.5.2FP1401.25%
6.5351.10%
6.5.5321.00%
Other52116.34%

CommuniGate Pro (2,824 servers)

Version Number of Servers Percent
5.1.162769.77%
6.0.92468.71%
6.0.81505.31%
6.0.71485.24%
5.2.20963.40%
4.1.8943.33%
6.0.5832.94%
5.4.11722.55%
5.3.15602.12%
5.3.13592.09%
5.0.14561.98%
4.2.10511.81%
5.2.19481.70%
5.2.3471.66%
5.4.4461.63%
5.4.8461.63%
5.2.16431.52%
5.4.1421.49%
5.4.6401.42%
6.0.1401.42%
6.0.6401.42%
5.4.10391.38%
5.4.5341.20%
5.1.12331.17%
6.0.4301.06%
Other90532.05%

WinWebMail (2,455 servers)

Version Number of Servers Percent
3.8.1.343517.72%
3.8.0.12339.49%
3.9.0.12309.37%
3.7.6.12208.96%
3.8.1.51777.21%
3.8.1.11455.91%
3.8.6.11445.87%
3.8.5.11405.70%
3.7.3.11395.66%
3.7.7.31204.89%
3.8.2.1963.91%
3.7.1.1722.93%
3.7.5.1522.12%
3.8.3.1461.87%
3.8.3.3401.63%
3.7.0.3301.22%
3.6.3.1271.10%
3.7.0.5251.02%
Other843.42%

XMail (1,820 servers)

Version Number of Servers Percent
1.2762034.07%
1.2248726.76%
1.2524513.46%
1.261769.67%
1.241045.71%
1.21512.80%
1.23281.54%
1.17221.21%
1.20201.10%
Other673.68%

Qmail Toaster (1,410 servers)

Version Number of Servers Percent
1.31,33994.96%
1.2362.55%
Other352.48%

Kerio (1,081 servers)

Version Number of Servers Percent
6.7.319317.85%
6.7.011110.27%
6.6.2978.97%
6.5.0857.86%
6.5.2767.03%
6.7.2656.01%
6.4.1635.83%
6.3.1524.81%
6.6.1504.63%
6.7.1474.35%
6.5.1353.24%
6.4.0343.15%
6.3.0242.22%
6.4.2232.13%
6.6.0232.13%
6.2.0121.11%
6.1.3111.02%
6.0.10111.02%
Other696.38%

SurgeSMTP (981 servers)

Version Number of Servers Percent
6.5a2-223523.96%
6.5a-111511.72%
6.3c2-2838.46%
6.4a-1767.75%
5.2a-1484.89%
5.3h2-2444.49%
6.1c-1353.57%
3.9e-1323.26%
3.8k4-4212.14%
6.0a5-5202.04%
4.0u4-4161.63%
6.7a-1151.53%
3.9h-18111.12%
6.6d-3111.12%
4.2d2-2101.02%
5.0e4-4101.02%
6.6d-32101.02%
Other18919.27%

Merak (796 servers)

Version Number of Servers Percent
8.0.327033.92%
8.9.110513.19%
8.5.0587.29%
8.3.8455.65%
7.4.5374.65%
7.5.2374.65%
7.6.4344.27%
7.6.1162.01%
7.2.0151.88%
7.0.1151.88%
8.3.15121.51%
9.0.0111.38%
8.2.4111.38%
8.9.0111.38%
7.4.2111.38%
7.1.681.01%
Other10012.56%

ArGoSoft (488 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)13527.66%
1.8 (1.8.9.5)7014.34%
1.8 (1.8.9.3)6813.93%
1.8 (1.8.9.1)449.02%
1.8 (1.8.8.7)295.94%
1.8 (1.8.8.8)275.53%
1.8 (1.8.9.2)163.28%
1.8 (1.8.9.4)142.87%
1.8 (1.8.6.0)102.05%
1.8 (1.8.8.9)81.64%
1.8 (1.8.7.3)71.43%
Other6012.30%

MagicMail (303 servers)

Version Number of Servers Percent
Other303100.00%

Post.Office (289 servers)

Version Number of Servers Percent
3.5.34214.53%
4.1.2.43612.46%
4.2.23110.73%
4.1.0.2186.23%
4.1.1175.88%
4.0.1144.84%
3.9.2.3103.46%
3.5.3J103.46%
4.1.0.382.77%
4.2.1.172.42%
3.1.2J62.08%
3.9.162.08%
4.262.08%
4.2.1.362.08%
3.1.251.73%
3.9.251.73%
4.1.0.451.73%
3.5.141.38%
3.8.7.441.38%
3.9.1.341.38%
4.1.2.341.38%
3.5.441.38%
3.9.1.231.04%
3.9.2.131.04%
3.5.231.04%
4.2.1.231.04%
4.1.2.231.04%
Other227.61%

GroupWise (266 servers)

Version Number of Servers Percent
7.0.34115.41%
8.0.23613.53%
6.5.73312.41%
7.0.4259.40%
8.0.3217.89%
12.0.2176.39%
7.0.2166.02%
6.5.4114.14%
6.5.693.38%
6.0.483.01%
14.0.083.01%
7.0.151.88%
8.0.041.50%
6.5.541.50%
12.0.141.50%
8.0.131.13%
6.5.031.13%
6.5.231.13%
6.0.131.13%
Other124.51%

Gordano Messaging Suite (GMS) (253 servers)

Version Number of Servers Percent
Other253100.00%

Trend Micro (206 servers)

Version Number of Servers Percent
5.78139.32%
5.54521.84%
5.183617.48%
7.0178.25%
7.1136.31%
8.541.94%
3.5331.46%
Other73.40%

OpenSMTPD (110 servers)

Version Number of Servers Percent
Other110100.00%

InterScan VirusWall (89 servers)

Version Number of Servers Percent
Other89100.00%

Mirapoint (74 servers)

Version Number of Servers Percent
4.3.5-GA1013.51%
4.4.3-GA810.81%
4.2.3-GA68.11%
4.3.6-GA68.11%
4.4.4-GA56.76%
4.4.2a-FCS45.41%
4.1.10-GA45.41%
4.3.7-GA45.41%
3.10.10a-GA34.05%
4.4.4b-GA22.70%
3.8.3-GA22.70%
3.8.4-GA22.70%
4.1.5-GA22.70%
3.10.7-GA22.70%
4.3.3-GA22.70%
4.1.9-GA22.70%
3.10.2-GA11.35%
3.8.7a11.35%
4.1.8-GA11.35%
4.2.4-GA11.35%
3.7.5a-GA11.35%
4.1.6-GA11.35%
3.3.3-GR11.35%
3.4.6-GR11.35%
4.1.3-GA11.35%
3.8.5-GA11.35%
Other00.00%

VisNetic (66 servers)

Version Number of Servers Percent
9.3.2.01827.27%
9.1.4.169.09%
8.0.3.146.06%
6.2.2.046.06%
8.5.0.846.06%
7.2.4.134.55%
5.5.8.334.55%
5.8.6.634.55%
9.1.4.034.55%
5.4.5.423.03%
7.6.1.023.03%
5.3.5.023.03%
5.0.2.323.03%
8.0.323.03%
5.0.2.023.03%
8.3.5.023.03%
8.3.0.111.52%
8.0.3.011.52%
9.1.4.1 provided by Techfount Systems Pte Ltd11.52%
8.5.0.511.52%
Other00.00%

Mercury (29 servers)

Version Number of Servers Percent
1.481551.72%
3.321137.93%
3.2113.45%
4.x13.45%
3.21c13.45%
Other00.00%

Interscan (24 servers)

Version Number of Servers Percent
3.55 (build 1016)416.67%
3.81-Build_1022416.67%
3.81-Build_1084312.50%
3.8-Build_3013312.50%
3.55 (build 1029)312.50%
3.53 (build 1493)28.33%
3.5 (build 1294)14.17%
3.51 (build 1337)14.17%
3.53 (build 2013)14.17%
3.53 (build 2017)14.17%
3.8-Build_108014.17%
Other00.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.3939.13%
8.4730.43%
7.3626.09%
8.214.35%
Other00.00%

WebSTAR V (20 servers)

Version Number of Servers Percent
5.4.1945.00%
5.4.0630.00%
5.3.4315.00%
5.3.315.00%
5.3.215.00%
Other00.00%

NetIQ MailMarshal (17 servers)

Version Number of Servers Percent
6.0.3.81058.82%
5.5.6.5211.76%
5.5.6.6211.76%
5.5.5.615.88%
5.5.4.1715.88%
5.5.6.715.88%
Other00.00%

Neon Mail Server (15 servers)

Version Number of Servers Percent
3.0.7426.67%
3.1.4320.00%
3.1.2213.33%
3.1.0213.33%
3.1.316.67%
3.0.616.67%
3.0.816.67%
3.0.916.67%
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%

MessageWall (8 servers)

Version Number of Servers Percent
1.0.8787.50%
1.0.6112.50%
Other00.00%

WebSTAR (5 servers)

Version Number of Servers Percent
Other5100.00%

MAILsweeper (4 servers)

Version Number of Servers Percent
4.3.17.0250.00%
4.3.19.0125.00%
4.3.20.0125.00%
Other00.00%




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