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Mail (MX) Server Survey
July 1st, 2010

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 Queried2,110,379   100.0%
Number of Servers that didn't respond348,80016.53%
    Server didn't open socket335,50915.90%
    Server didn't provide banner13,2910.63%
Server provided banner1,761,57983.47%
Server banner identifies software in use969,01645.92%

As indicated by the above table, of the 2,110,379 servers queried, only 969,016 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
Exim330,91934.15%
Postfix204,69521.12%
Microsoft173,06317.86%
Sendmail159,57416.47%
MailEnable30,3743.13%
MDaemon22,6422.34%
IMail13,0621.35%
Lotus Domino5,3610.55%
Kerio4,9430.51%
WinWebMail4,7610.49%
CommuniGate Pro3,8600.40%
Merak2,7680.29%
XMail2,6110.27%
Qmail Toaster1,7370.18%
ArGoSoft1,4870.15%
SurgeSMTP1,4220.15%
GroupWise1,3950.14%
Trend Micro9960.10%
Gordano Messaging Suite (GMS)5900.06%
Post.Office5810.06%
MagicMail4540.05%
Mirapoint3990.04%
VisNetic3170.03%
InterScan VirusWall3000.03%
NetIQ MailMarshal1690.02%
Interscan1360.01%
Mercury940.01%
WebSTAR V820.01%
Neon Mail Server770.01%
ModusMail330.00%
MessageWall320.00%
WebSTAR290.00%
MAILsweeper240.00%
OpenVMS230.00%
OpenSMTPD60.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (330,919 servers)

Version Number of Servers Percent
4.69280,87984.88%
4.6714,2734.31%
4.6312,8203.87%
4.717,5742.29%
Other15,3734.65%

Postfix (204,695 servers)

Version Number of Servers Percent
Other204,695100.00%

Microsoft (173,063 servers)

Version Number of Servers Percent
6.0.3790.467588,75551.28%
6.0.3790.395963,99236.98%
6.0.3790.183011,2996.53%
5.0.2195.67133,2121.86%
5.0.2195.73812,3711.37%
Other3,4341.98%

Sendmail (159,574 servers)

Version Number of Servers Percent
8.13.130,30218.99%
8.13.826,42716.56%
8.14.315,5749.76%
8.14.412,6517.93%
8.12.11.2006061412,3317.73%
8.12.11.2006030812,3307.73%
8.13.6.200606146,1563.86%
8.13.65,5393.47%
8.12.105,4663.43%
8.11.65,1263.21%
8.14.25,0743.18%
8.14.13,8042.38%
8.12.113,5042.20%
8.13.42,8711.80%
8.13.72,8361.78%
8.12.82,4181.52%
Other7,1654.49%

MailEnable (30,374 servers)

Version Number of Servers Percent
1.986--9,48031.21%
1.981--3,30310.87%
1.983--2,1287.01%
3.62--1,3554.46%
0-3.63-8592.83%
4.22--8462.79%
1.96--6112.01%
1.95--5771.90%
0-4.22-4961.63%
1.9--4591.51%
0-2.53-4511.48%
0-1.87-4281.41%
4.17--4081.34%
0-3.61-4041.33%
0-3.6-3811.25%
--3.633791.25%
4.0--3361.11%
0-3.14-3351.10%
4.22--4.223201.05%
Other6,81822.45%

MDaemon (22,642 servers)

Version Number of Servers Percent
11.0.22,60411.50%
10.1.22,51311.10%
10.0.01,3716.06%
10.1.11,3155.81%
11.0.01,3085.78%
11.0.11,2225.40%
9.6.19144.04%
9.6.68523.76%
10.1.07773.43%
10.0.56592.91%
9.6.55982.64%
9.5.25712.52%
10.0.45252.32%
10.0.25152.27%
9.6.44822.13%
9.5.14822.13%
9.6.24491.98%
9.5.64351.92%
8.1.34321.91%
9.0.43971.75%
9.6.32671.18%
6.8.52651.17%
9.5.52641.17%
7.2.32621.16%
9.0.12371.05%
Other2,92612.92%

IMail (13,062 servers)

Version Number of Servers Percent
8.222,45018.76%
11.011,2849.83%
8.151,2579.62%
9.239707.43%
10.027475.72%
8.056234.77%
11.06224.76%
11.025203.98%
9.205123.92%
9.104873.73%
7.074383.35%
9.213662.80%
7.153042.33%
10.012972.27%
8.002652.03%
6.062571.97%
8.041911.46%
8.211481.13%
8.101361.04%
Other1,1889.10%

Lotus Domino (5,361 servers)

Version Number of Servers Percent
8.5.165912.29%
8.54778.90%
7.0.23777.03%
8.5.1FP22985.56%
8.0.22454.57%
7.0.32294.27%
8.0.12113.94%
7.0.11943.62%
6.5.41763.28%
6.5.11663.10%
7.0.3FP11432.67%
6.5.31392.59%
8.5.1FP11302.42%
8.01282.39%
6.5.51272.37%
7.0.2FP21262.35%
7.01232.29%
8.5FP11142.13%
8.5.1FP3971.81%
6.5931.73%
5.0.11681.27%
Other1,04119.42%

Kerio (4,943 servers)

Version Number of Servers Percent
6.7.388417.88%
6.7.255711.27%
6.6.254010.92%
6.7.053010.72%
6.7.12815.68%
6.5.02815.68%
6.5.22645.34%
6.4.12084.21%
6.3.12054.15%
6.5.11482.99%
6.6.01452.93%
6.4.01422.87%
6.4.21132.29%
6.6.11082.18%
6.3.0871.76%
Other4509.10%

WinWebMail (4,761 servers)

Version Number of Servers Percent
3.8.0.11,31427.60%
3.7.6.181817.18%
3.7.7.362413.11%
3.7.3.159112.41%
3.7.1.12966.22%
3.8.1.12274.77%
3.7.5.12084.37%
3.7.7.11573.30%
3.6.3.11513.17%
3.7.0.51402.94%
3.7.0.31072.25%
3.7.0.7952.00%
Other330.69%

CommuniGate Pro (3,860 servers)

Version Number of Servers Percent
5.1.162376.14%
4.1.82205.70%
5.2.162145.54%
5.3.72065.34%
4.2.101433.70%
5.3.51303.37%
5.2.141173.03%
5.2.191002.59%
5.3.2952.46%
5.2.3952.46%
5.1.12922.38%
5.2.12912.36%
5.2.8792.05%
5.0.14782.02%
5.1.13761.97%
5.2.18741.92%
5.2.13741.92%
5.2.10671.74%
5.3.4571.48%
5.2.17551.42%
5.1.14551.42%
5.2.11521.35%
5.0.9501.30%
5.2.9501.30%
5.1.9491.27%
5.2.20481.24%
5.2.6471.22%
5.2.0451.17%
4.2.9401.04%
4.2.8401.04%
5.3.1391.01%
Other1,04527.07%

Merak (2,768 servers)

Version Number of Servers Percent
8.0.31,17842.56%
8.9.12629.47%
8.5.01645.92%
7.4.51405.06%
7.5.21264.55%
8.3.81083.90%
7.6.41073.87%
7.4.2491.77%
8.2.13451.63%
9.0.0371.34%
7.6.1361.30%
7.2.0351.26%
8.2.4311.12%
8.3.15301.08%
8.9.0291.05%
7.0.1291.05%
Other36213.08%

XMail (2,611 servers)

Version Number of Servers Percent
1.2566725.55%
1.2263224.21%
1.2635213.48%
1.2434913.37%
1.211425.44%
1.271124.29%
1.23692.64%
1.20672.57%
1.17622.37%
1.12542.07%
Other1054.02%

Qmail Toaster (1,737 servers)

Version Number of Servers Percent
1.31,58791.36%
1.21116.39%
1.0291.67%
Other100.58%

ArGoSoft (1,487 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)26417.75%
1.8 (1.8.9.5)25617.22%
1.8 (1.8.9.3)19312.98%
1.8 (1.8.9.1)1328.88%
1.8 (1.8.8.8)1177.87%
1.8 (1.8.8.7)986.59%
1.8 (1.8.9.2)604.03%
1.8 (1.8.9.4)513.43%
1.8 (1.8.8.9)332.22%
1.8 (1.8.8.1)291.95%
1.8 (1.8.9.0)271.82%
1.8 (1.8.6.0)231.55%
Other20413.72%

SurgeSMTP (1,422 servers)

Version Number of Servers Percent
4.2d4-423816.74%
4.3e-116111.32%
3.9e-115510.90%
4.3g-11158.09%
4.2d2-2916.40%
4.0u4-4866.05%
3.8k4-4855.98%
4.2a3-3372.60%
3.8i3-3342.39%
3.7b8-8332.32%
3.8f3-3302.11%
3.9c-1261.83%
3.6f5-5261.83%
4.3g2-2211.48%
3.5b3-3201.41%
3.8f2-2171.20%
3.9g2-2161.13%
Other23116.24%

GroupWise (1,395 servers)

Version Number of Servers Percent
7.0.340629.10%
8.0.118713.41%
6.5.716812.04%
7.0.216511.83%
7.0.1835.95%
6.5.4815.81%
6.5.6543.87%
8.0.0493.51%
6.0.4433.08%
6.5.1372.65%
6.5.5201.43%
7.0161.15%
7.0.4151.08%
Other715.09%

Trend Micro (996 servers)

Version Number of Servers Percent
5.744844.98%
5.528328.41%
5.1815615.66%
7.0777.73%
7141.41%
Other181.81%

Gordano Messaging Suite (GMS) (590 servers)

Version Number of Servers Percent
Other590100.00%

Post.Office (581 servers)

Version Number of Servers Percent
3.5.39917.04%
4.1.0.26811.70%
4.0.1498.43%
3.5.3J417.06%
4.1.1294.99%
3.8.3254.30%
4.1.0.4203.44%
3.9.2.3183.10%
3.1.2J172.93%
3.6.3162.75%
3.9.1152.58%
3.6.2142.41%
3.8.7.4122.07%
3.9.2122.07%
4.1111.89%
3.1.2111.89%
4.0.1.1101.72%
3.9.0101.72%
4.0.0.2101.72%
4.1.0.391.55%
3.9.2.181.38%
3.5.281.38%
4.0.0.181.38%
3.9.1.371.20%
3.9.1.261.03%
3.8.461.03%
Other427.23%

MagicMail (454 servers)

Version Number of Servers Percent
Other454100.00%

Mirapoint (399 servers)

Version Number of Servers Percent
3.8.4-GA4711.78%
3.10.5-GA358.77%
3.10.8-GA358.77%
3.8.3-GA328.02%
3.10.7-GA307.52%
3.10.9-GA276.77%
3.10.4-GA215.26%
4.1.8-GA184.51%
4.1.3-GA174.26%
4.1.9-GA143.51%
3.10.6-GA133.26%
3.10.3-GA133.26%
3.8.7a112.76%
3.8.6-GA92.26%
3.8.2-GA92.26%
4.1.4-GA92.26%
3.7.5a-GA82.01%
3.10.2-GA71.75%
4.1.5-GA71.75%
3.8.5-GA71.75%
4.0.5a61.50%
3.7.3a-GA41.00%
Other205.01%

VisNetic (317 servers)

Version Number of Servers Percent
9.3.2.012539.43%
9.1.4.14112.93%
5.8.6.6165.05%
8.5.0.8134.10%
6.2.2.0103.15%
5.5.8.3103.15%
8.0.3.192.84%
8.0.3.082.52%
7.6.1.082.52%
8.3.5.072.21%
9.1.4.072.21%
8.0.372.21%
7.2.4.161.89%
5.3.5.061.89%
8.3.661.89%
5.0.2.361.89%
5.4.5.451.58%
7.2.4.041.26%
Other237.26%

InterScan VirusWall (300 servers)

Version Number of Servers Percent
Other300100.00%

NetIQ MailMarshal (169 servers)

Version Number of Servers Percent
6.0.3.812674.56%
5.5.6.7137.69%
6.1.3.15127.10%
5.5.6.642.37%
5.5.4.1642.37%
5.5.6.531.78%
5.5.3.1721.18%
Other52.96%

Interscan (136 servers)

Version Number of Servers Percent
3.55 (build 1016)2216.18%
3.81-Build_10221913.97%
3.53 (build 2017)1712.50%
3.55 (build 1029)1511.03%
3.81-Build_1084118.09%
3.8-Build_301385.88%
3.53 (build 2011)85.88%
3.55 (build 1020)75.15%
3.53 (build 1493)64.41%
3.52 (build 1375)42.94%
3.53 (build 2013)32.21%
3.8-Build_108021.47%
3.53 (build 1494)21.47%
Other128.82%

Mercury (94 servers)

Version Number of Servers Percent
1.485053.19%
3.322324.47%
3.21c88.51%
1.4733.19%
3.01a22.13%
1.4922.13%
3.3022.13%
3.2111.06%
1.4411.06%
4.5211.06%
3.3111.06%
Other00.00%

WebSTAR V (82 servers)

Version Number of Servers Percent
5.4.12631.71%
5.4.02328.05%
5.3.41821.95%
5.3.278.54%
5.3.344.88%
5.2.322.44%
5.3.011.22%
5.3.111.22%
Other00.00%

Neon Mail Server (77 servers)

Version Number of Servers Percent
3.1.31722.08%
3.0.71722.08%
3.0.91114.29%
3.1.41012.99%
3.1.279.09%
3.1.067.79%
3.1.556.49%
3.1.133.90%
3.0.611.30%
Other00.00%

ModusMail (33 servers)

Version Number of Servers Percent
4.35.477.0927.27%
4.35.480.0515.15%
4.2.420.0515.15%
4.1.361.2126.06%
3.2.315.026.06%
3.1.293.126.06%
3.1.302.026.06%
4.35.480.1126.06%
4.2.425.2213.03%
4.0.340.313.03%
4.3.459.013.03%
4.35.477.813.03%
Other00.00%

MessageWall (32 servers)

Version Number of Servers Percent
1.0.82990.62%
1.0.1113.12%
1.0.613.12%
1.1.013.12%
Other00.00%

WebSTAR (29 servers)

Version Number of Servers Percent
Other29100.00%

MAILsweeper (24 servers)

Version Number of Servers Percent
4.3.20.0729.17%
4.3.17.0416.67%
4.3.14.0416.67%
4.3.6.0416.67%
4.3.1.028.33%
4.3.19.014.17%
4.3.10.014.17%
4.2.5.014.17%
Other00.00%

OpenVMS (23 servers)

Version Number of Servers Percent
8.31356.52%
7.3626.09%
8.228.70%
6.114.35%
7.214.35%
Other00.00%

OpenSMTPD (6 servers)

Version Number of Servers Percent
Other6100.00%




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