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Mail (MX) Server Survey
November 1st, 2013

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 Queried2,480,200   100.0%
Number of Servers that didn't respond437,98317.66%
    Server didn't open socket426,14517.18%
    Server didn't provide banner11,8380.48%
Server provided banner2,042,21782.34%
Server banner identifies software in use1,133,39945.70%

As indicated by the above table, of the 2,480,200 servers queried, only 1,133,399 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
Exim562,14549.60%
Postfix314,51227.75%
Sendmail108,6599.59%
Microsoft70,0676.18%
MailEnable32,6422.88%
MDaemon20,3961.80%
IMail6,2150.55%
Lotus Domino3,8940.34%
CommuniGate Pro2,9920.26%
WinWebMail2,8490.25%
XMail1,9900.18%
Kerio1,2630.11%
Qmail Toaster1,2490.11%
Merak9730.09%
SurgeSMTP9530.08%
ArGoSoft5780.05%
Post.Office3240.03%
GroupWise3200.03%
MagicMail2930.03%
Gordano Messaging Suite (GMS)2700.02%
Trend Micro2550.02%
InterScan VirusWall1090.01%
Mirapoint1050.01%
VisNetic900.01%
OpenSMTPD630.01%
Mercury440.00%
Interscan320.00%
WebSTAR V220.00%
NetIQ MailMarshal220.00%
OpenVMS200.00%
Neon Mail Server180.00%
WebSTAR110.00%
MessageWall110.00%
ModusMail90.00%
MAILsweeper40.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (562,145 servers)

Version Number of Servers Percent
4.80.1332,73859.19%
4.80140,44424.98%
4.7221,6393.85%
4.7617,1863.06%
4.6916,2302.89%
4.7712,6782.26%
Other21,2303.78%

Postfix (314,512 servers)

Version Number of Servers Percent
Other314,512100.00%

Sendmail (108,659 servers)

Version Number of Servers Percent
8.13.827,91325.69%
8.13.115,08313.88%
8.14.314,64913.48%
8.14.414,39313.25%
8.14.513,53612.46%
8.12.11.200603083,6463.36%
8.13.6.200606143,0412.80%
8.14.22,3872.20%
8.11.61,6301.50%
8.12.101,4981.38%
8.14.11,3921.28%
8.14.71,3011.20%
8.13.61,1951.10%
Other6,9956.44%

Microsoft (70,067 servers)

Version Number of Servers Percent
6.0.3790.467556,39580.49%
6.0.3790.39596,6939.55%
7.5.7601.175142,1563.08%
6.0.3790.18301,7742.53%
Other3,0494.35%

MailEnable (32,642 servers)

Version Number of Servers Percent
1.986--4,42313.55%
6.5--2,3887.32%
5.10--2,0136.17%
4.26--1,5304.69%
6.0--1,2903.95%
7.06--8652.65%
1.981--8452.59%
7.50--6522.00%
7.07--6171.89%
7.0--5741.76%
7.09--5591.71%
6.70--5561.70%
6.57--5161.58%
6.03--5111.57%
3.62--4821.48%
1.983--4721.45%
0-6.83-4171.28%
5.51--3891.19%
0-3.65-3601.10%
Other13,18340.39%

MDaemon (20,396 servers)

Version Number of Servers Percent
13.5.22,92214.33%
11.0.31,5127.41%
13.0.51,2886.31%
13.0.41,2666.21%
11.0.01,2185.97%
13.5.19454.63%
13.0.37753.80%
10.0.06663.27%
12.5.66203.04%
10.1.25342.62%
10.1.15302.60%
13.0.24552.23%
12.5.43951.94%
9.6.13841.88%
9.6.63601.77%
10.1.03501.72%
9.6.22761.35%
13.5.02521.24%
9.5.22421.19%
12.5.82211.08%
12.0.32201.08%
10.0.52131.04%
10.0.22111.03%
Other4,54122.26%

IMail (6,215 servers)

Version Number of Servers Percent
8.221,01016.25%
12.3.0.10082013.19%
12.2.0.23568611.04%
11.54447.14%
8.153525.66%
9.233475.58%
11.032524.05%
8.052433.91%
10.022013.23%
12.1.0.2701722.77%
11.011482.38%
11.021352.17%
7.071302.09%
12.2.0.1691161.87%
7.151081.74%
8.001031.66%
6.06961.54%
10.01941.51%
11.0691.11%
9.21631.01%
Other62610.07%

Lotus Domino (3,894 servers)

Version Number of Servers Percent
8.5.364916.67%
8.5.3FP32606.68%
8.5.22065.29%
8.5.3FP41955.01%
8.5.3FP21904.88%
8.5.11614.13%
8.5.2FP21523.90%
7.0.21453.72%
8.5.3FP11383.54%
8.51183.03%
8.5.2FP31112.85%
8.5.2FP4962.47%
8.5.3FP5852.18%
7.0.3751.93%
8.5.1FP5721.85%
8.5.2FP1661.69%
8.0.1651.67%
7.0641.64%
8.0.2601.54%
6.5.3591.52%
6.5.4561.44%
6.5.1561.44%
7.0.1541.39%
8.0451.16%
6.5.5451.16%
Other67117.23%

CommuniGate Pro (2,992 servers)

Version Number of Servers Percent
5.1.162709.02%
6.0.51484.95%
6.0.7983.28%
5.2.20973.24%
4.1.8882.94%
5.4.10762.54%
6.0.6682.27%
6.0.1632.11%
5.3.13591.97%
5.4.4561.87%
5.4.6561.87%
5.4.8561.87%
5.1.12541.80%
4.2.10521.74%
5.0.14471.57%
6.0.4461.54%
5.2.19461.54%
5.2.3431.44%
5.2.16421.40%
5.4.1421.40%
5.4.5411.37%
5.3.15381.27%
5.4.2321.07%
5.4.7321.07%
5.4.9311.04%
5.4.0301.00%
Other1,28142.81%

WinWebMail (2,849 servers)

Version Number of Servers Percent
3.8.1.353918.92%
3.8.0.132411.37%
3.7.6.12669.34%
3.8.5.12448.56%
3.8.1.52267.93%
3.8.1.11906.67%
3.7.3.11726.04%
3.7.7.31555.44%
3.8.2.11424.98%
3.8.6.11073.76%
3.7.1.1893.12%
3.7.5.1752.63%
3.8.3.1702.46%
3.8.3.3592.07%
3.7.0.5381.33%
3.7.0.3361.26%
3.6.3.1351.23%
Other822.88%

XMail (1,990 servers)

Version Number of Servers Percent
1.2763131.71%
1.2249825.03%
1.2529714.92%
1.2620410.25%
1.241276.38%
1.21613.07%
1.23391.96%
1.17311.56%
1.20231.16%
Other793.97%

Kerio (1,263 servers)

Version Number of Servers Percent
6.7.322117.50%
6.7.012710.06%
6.6.21239.74%
6.5.0997.84%
6.5.2876.89%
6.7.2786.18%
6.4.1705.54%
6.7.1634.99%
6.3.1544.28%
6.6.1493.88%
6.4.0433.40%
6.5.1403.17%
6.4.2292.30%
6.6.0272.14%
6.3.0262.06%
6.0.10191.50%
6.2.0131.03%
Other957.52%

Qmail Toaster (1,249 servers)

Version Number of Servers Percent
1.31,18194.56%
1.2362.88%
Other322.56%

Merak (973 servers)

Version Number of Servers Percent
8.0.336737.72%
8.9.111311.61%
8.5.0676.89%
8.3.8484.93%
7.5.2464.73%
7.6.4394.01%
7.4.5383.91%
7.4.2171.75%
7.6.1161.64%
7.0.1161.64%
8.3.15141.44%
9.0.0141.44%
7.2.0141.44%
7.6.0131.34%
8.9.0121.23%
6.2.1111.13%
4.4.2111.13%
8.2.4101.03%
Other10711.00%

SurgeSMTP (953 servers)

Version Number of Servers Percent
6.3c2-224025.18%
6.4a-117017.84%
5.3h2-2555.77%
5.2a-1555.77%
6.1c-1535.56%
3.9e-1343.57%
6.0a5-5242.52%
3.8k4-4181.89%
4.0u4-4181.89%
5.0e4-4151.57%
6.5a-1141.47%
6.5b-7131.36%
6.0a4-4121.26%
4.2d2-2121.26%
4.3g2-2111.15%
Other20921.93%

ArGoSoft (578 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)14525.09%
1.8 (1.8.9.5)8214.19%
1.8 (1.8.9.3)7312.63%
1.8 (1.8.9.1)6010.38%
1.8 (1.8.8.7)386.57%
1.8 (1.8.8.8)325.54%
1.8 (1.8.9.2)213.63%
1.8 (1.8.9.4)183.11%
1.8 (1.8.8.9)111.90%
1.8 (1.8.6.0)101.73%
1.8 (1.8.7.3)71.21%
1.8 (1.8.8.1)61.04%
Other7512.98%

Post.Office (324 servers)

Version Number of Servers Percent
3.5.34212.96%
4.1.2.43310.19%
4.1.0.2278.33%
4.0.1185.56%
4.1.1154.63%
4.2.2154.63%
3.9.2.3123.70%
3.5.3J123.70%
4.2123.70%
4.1.0.392.78%
4.1.0.482.47%
3.8.382.47%
3.1.2J72.16%
3.9.272.16%
3.1.272.16%
4.2.1.361.85%
3.9.161.85%
4.2.1.151.54%
3.6.251.54%
4.1.2.351.54%
4.0.1.151.54%
3.9.1.251.54%
3.5.441.23%
3.5.141.23%
3.9.2.241.23%
3.9.1.341.23%
4.141.23%
Other3510.80%

GroupWise (320 servers)

Version Number of Servers Percent
7.0.35416.88%
8.0.24815.00%
6.5.73811.88%
7.0.4247.50%
8.0.3237.19%
7.0.2216.56%
6.5.4154.69%
6.5.6134.06%
12.0.2134.06%
7.0.1103.12%
6.0.492.81%
12.0.192.81%
6.5.161.88%
8.0.051.56%
8.0.151.56%
12.0.051.56%
7.041.25%
6.5.541.25%
Other144.38%

MagicMail (293 servers)

Version Number of Servers Percent
Other293100.00%

Gordano Messaging Suite (GMS) (270 servers)

Version Number of Servers Percent
Other270100.00%

Trend Micro (255 servers)

Version Number of Servers Percent
5.710139.61%
5.55722.35%
5.184216.47%
7.02610.20%
7.1176.67%
3.5331.18%
Other93.53%

InterScan VirusWall (109 servers)

Version Number of Servers Percent
Other109100.00%

Mirapoint (105 servers)

Version Number of Servers Percent
4.3.5-GA1615.24%
3.10.10a-GA1413.33%
4.3.6-GA109.52%
4.2.3-GA87.62%
4.1.10-GA65.71%
4.4.2a-FCS65.71%
3.10.9-GA54.76%
3.10.8-GA43.81%
4.2.4-GA43.81%
4.1.5-GA32.86%
4.1.9-GA32.86%
4.4.3-GA21.90%
3.8.5-GA21.90%
3.8.3-GA21.90%
4.3.7-GA21.90%
3.10.3-GA21.90%
4.3.3-GA21.90%
3.8.4-GA21.90%
4.1.3-GA21.90%
Other109.52%

VisNetic (90 servers)

Version Number of Servers Percent
9.3.2.02426.67%
9.1.4.11011.11%
5.5.8.377.78%
8.0.3.166.67%
8.5.0.844.44%
7.6.1.044.44%
6.2.2.044.44%
7.2.4.133.33%
5.8.6.633.33%
5.0.2.333.33%
8.0.3.033.33%
9.1.4.033.33%
5.8.6.422.22%
5.4.5.422.22%
5.3.5.022.22%
8.3.0.011.11%
8.3.0.111.11%
8.0.311.11%
5.0.2.011.11%
8.3.5.011.11%
9.1.4.1 da-lax-msg mail.davidco.com11.11%
6.0.9.011.11%
7.5.3.011.11%
9.1.4.1 provided by Techfount Systems Pte Ltd11.11%
8.5.0.511.11%
Other00.00%

OpenSMTPD (63 servers)

Version Number of Servers Percent
Other63100.00%

Mercury (44 servers)

Version Number of Servers Percent
1.482454.55%
3.321329.55%
3.21c36.82%
1.4724.55%
3.2112.27%
4.x12.27%
Other00.00%

Interscan (32 servers)

Version Number of Servers Percent
3.81-Build_1022618.75%
3.55 (build 1016)618.75%
3.55 (build 1029)515.62%
3.81-Build_108439.38%
3.8-Build_301326.25%
3.53 (build 2011)26.25%
3.5 (build 1294)13.12%
3.55 (build 1020)13.12%
3.51 (build 1337)13.12%
3.53 (build 2013)13.12%
3.53 (build 2017)13.12%
3.53 (build 1493)13.12%
3.8-Build_304513.12%
3.8-Build_108013.12%
Other00.00%

WebSTAR V (22 servers)

Version Number of Servers Percent
5.4.11150.00%
5.4.0522.73%
5.3.4313.64%
5.3.229.09%
5.3.314.55%
Other00.00%

NetIQ MailMarshal (22 servers)

Version Number of Servers Percent
6.0.3.81359.09%
5.5.6.529.09%
5.5.6.729.09%
5.5.6.629.09%
5.5.5.614.55%
5.5.4.1714.55%
6.1.3.1514.55%
Other00.00%

OpenVMS (20 servers)

Version Number of Servers Percent
8.3945.00%
8.4630.00%
7.3420.00%
8.215.00%
Other00.00%

Neon Mail Server (18 servers)

Version Number of Servers Percent
3.0.7527.78%
3.1.2316.67%
3.1.4211.11%
3.0.9211.11%
3.1.0211.11%
3.1.5211.11%
3.1.315.56%
3.0.615.56%
Other00.00%

WebSTAR (11 servers)

Version Number of Servers Percent
Other11100.00%

MessageWall (11 servers)

Version Number of Servers Percent
1.0.81090.91%
1.0.619.09%
Other00.00%

ModusMail (9 servers)

Version Number of Servers Percent
4.35.477.0666.67%
4.1.361.21111.11%
4.35.477.8111.11%
3.1.302.0111.11%
Other00.00%

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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