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Mail (MX) Server Survey
November 1st, 2006

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 Queried1,660,131   100.0%
Number of Servers that didn't respond233,21614.05%
    Server didn't open socket225,15413.56%
    Server didn't provide banner8,0620.49%
Server provided banner1,426,91585.95%
Server banner identifies software in use905,78454.56%

As indicated by the above table, of the 1,660,131 servers queried, only 905,784 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
Sendmail297,34332.83%
Microsoft187,95520.75%
Exim158,38117.49%
Postfix115,21912.72%
IMail46,7915.17%
MDaemon21,0712.33%
MailEnable18,1692.01%
Lotus Domino8,8700.98%
Merak8,6120.95%
CommuniGate Pro5,5740.62%
Trend Micro4,8130.53%
GroupWise4,7410.52%
WinWebMail4,0320.45%
Kerio3,8580.43%
ArGoSoft3,2050.35%
XMail2,3830.26%
Gordano Messaging Suite (GMS)1,7940.20%
NetIQ MailMarshal1,7460.19%
SurgeSMTP1,6810.19%
Interscan1,4610.16%
Post.Office1,3770.15%
InterScan VirusWall1,3260.15%
ModusMail1,2800.14%
Qmail Toaster1,0280.11%
VisNetic7550.08%
Mirapoint4880.05%
MAILsweeper4160.05%
Mercury3870.04%
WebSTAR V3600.04%
WebSTAR1730.02%
MessageWall1700.02%
Neon Mail Server1580.02%
MagicMail1320.01%
OpenVMS350.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (297,343 servers)

Version Number of Servers Percent
8.12.11.2006061452,33617.60%
8.11.644,42414.94%
8.12.11.2006030829,95110.07%
8.13.628,9179.73%
8.12.1024,7888.34%
8.13.119,4046.53%
8.12.1115,0455.06%
8.13.412,1724.09%
8.12.811,6933.93%
8.13.6.200606149,0693.05%
8.10.28,2872.79%
8.9.37,5032.52%
8.13.77,0872.38%
8.13.86,5202.19%
8.13.33,4311.15%
8.12.93,1341.05%
Other13,5824.57%

Microsoft (187,955 servers)

Version Number of Servers Percent
6.0.3790.1830114,79561.08%
5.0.2195.671340,13421.35%
6.0.3790.21120,85611.10%
5.5.2653.133,4031.81%
6.0.3790.03,2791.74%
Other5,4882.92%

Exim (158,381 servers)

Version Number of Servers Percent
4.52116,10573.31%
4.5010,4086.57%
4.606,6644.21%
4.634,8023.03%
4.623,6042.28%
4.443,1121.96%
3.361,9931.26%
Other11,6937.38%

Postfix (115,219 servers)

Version Number of Servers Percent
Other115,219100.00%

IMail (46,791 servers)

Version Number of Servers Percent
8.1512,89527.56%
8.225,73612.26%
6.065,64312.06%
8.055,08610.87%
9.102,1764.65%
8.211,9974.27%
7.151,9354.14%
7.071,7123.66%
9.041,3242.83%
8.209962.13%
8.007281.56%
8.107051.51%
8.146051.29%
8.125591.19%
Other4,69410.03%

MDaemon (21,071 servers)

Version Number of Servers Percent
9.0.72,20410.46%
8.1.32,0479.71%
9.0.61,8348.70%
9.0.41,5397.30%
6.8.51,2105.74%
8.1.49934.71%
7.2.39744.62%
9.0.19284.40%
7.2.08834.19%
9.0.57723.66%
9.0.07043.34%
8.0.26633.15%
8.1.15322.52%
8.0.35322.52%
8.1.55182.46%
7.1.24492.13%
7.1.04212.00%
7.2.24141.96%
6.8.43751.78%
7.2.13521.67%
8.0.13461.64%
7.0.13371.60%
Other2,0449.70%

MailEnable (18,169 servers)

Version Number of Servers Percent
1.8--2,80715.45%
1.9--2,39113.16%
1.96--1,6489.07%
1.95--1,5968.78%
0-1.75-8894.89%
0-1.79-7454.10%
0-1.54-7153.94%
0-1.6-6083.35%
0-2.2-5392.97%
0-2.11-4452.45%
1.73--4312.37%
0--2.24072.24%
0-1.71-3201.76%
0-1.72-2951.62%
1.91--2931.61%
1.71--2881.59%
1.92--2561.41%
0--2.111871.03%
Other3,30918.21%

Lotus Domino (8,870 servers)

Version Number of Servers Percent
6.5.492610.44%
6.5.18539.62%
7.0.17828.82%
6.5.36527.35%
7.05716.44%
6.5.55215.87%
6.54354.90%
6.5.23964.46%
5.0.113934.43%
5.0.122813.17%
7.0.1FP12612.94%
5.0.82222.50%
6.5.4FP22052.31%
5.0.101982.23%
5.0.13a1681.89%
6.0.2CF11611.82%
6.5.4FP11601.80%
6.5.5FP11491.68%
6.0.31471.66%
6.01361.53%
6.5.4FP31191.34%
7.0.21161.31%
5.0.91131.27%
6.5.3FP1961.08%
5.0.5941.06%
Other7158.06%

Merak (8,612 servers)

Version Number of Servers Percent
8.5.02,14324.88%
8.0.31,89021.95%
8.3.87488.69%
7.4.54735.49%
7.6.43714.31%
7.5.23544.11%
8.2.42562.97%
7.4.22352.73%
7.2.02012.33%
6.2.11551.80%
8.3.01371.59%
7.4.01201.39%
4.4.21111.29%
7.6.11071.24%
5.5.7871.01%
Other1,22414.21%

CommuniGate Pro (5,574 servers)

Version Number of Servers Percent
4.1.888015.79%
5.0.959410.66%
4.2.1057110.24%
4.2.42314.14%
5.0.82223.98%
4.2.81893.39%
5.11883.37%
5.0.111863.34%
4.21662.98%
4.3.81522.73%
4.2.91422.55%
4.0.61392.49%
5.0.101272.28%
4.2.71272.28%
4.3.61262.26%
3.5.91011.81%
4.0.1961.72%
5.0.6951.70%
4.2.3661.18%
4.3.4651.17%
5.0.1641.15%
5.0.7621.11%
4.2.6611.09%
Other92416.58%

Trend Micro (4,813 servers)

Version Number of Servers Percent
5.52,97061.71%
5.71,29426.89%
5.184729.81%
5.15521.08%
Other250.52%

GroupWise (4,741 servers)

Version Number of Servers Percent
7.0.198920.86%
6.5.477916.43%
7.03868.14%
6.0.43848.10%
6.5.53787.97%
6.5.63196.73%
6.5.12835.97%
6.5.71883.97%
6.5.31743.67%
6.5.21713.61%
6.0.21322.78%
6.0.31132.38%
5.5.51062.24%
6.5.01042.19%
6.0.1831.75%
Other1523.21%

WinWebMail (4,032 servers)

Version Number of Servers Percent
3.7.1.11,35633.63%
3.6.3.11,02125.32%
3.7.0.562015.38%
3.7.0.756313.96%
3.7.0.341710.34%
Other551.36%

Kerio (3,858 servers)

Version Number of Servers Percent
6.2.275219.49%
6.2.049212.75%
6.1.43408.81%
6.1.33338.63%
6.1.22867.41%
6.1.02295.94%
6.2.11874.85%
6.0.101784.61%
6.1.11523.94%
6.0.31173.03%
6.0.8862.23%
6.0.6711.84%
5.7.10681.76%
6.0.9651.68%
6.0.7551.43%
5.7.9411.06%
Other40610.52%

ArGoSoft (3,205 servers)

Version Number of Servers Percent
1.8 (1.8.8.7)89627.96%
1.8 (1.8.8.8)65820.53%
1.8 (1.8.8.1)1474.59%
1.8 (1.8.6.0)1233.84%
1.8 (1.8.8.2)973.03%
1.8 (1.8.8.3)973.03%
1.8 (1.8.8.5)922.87%
1.8 (1.8.8.4)832.59%
1.8 (1.8.7.5)732.28%
1.8 (1.8.8.6)662.06%
1.8 (1.8.5.9)601.87%
1.8 (1.8.6.6)491.53%
1.8 (1.8.8.9 461.44%
1.8 (1.8.7.6)411.28%
1.8 (1.8.7.3)411.28%
Other63619.84%

XMail (2,383 servers)

Version Number of Servers Percent
1.221,01542.59%
1.2154222.74%
1.2025610.74%
1.172179.11%
1.18783.27%
1.12712.98%
1.16431.80%
1.10381.59%
1.15291.22%
1.11271.13%
Other672.81%

Gordano Messaging Suite (GMS) (1,794 servers)

Version Number of Servers Percent
Other1,794100.00%

NetIQ MailMarshal (1,746 servers)

Version Number of Servers Percent
6.0.3.81,21969.82%
5.5.6.71729.85%
6.1.3.15885.04%
5.5.5.9512.92%
5.5.4.16492.81%
5.5.6.6382.18%
5.5.6.5331.89%
5.5.5.6261.49%
5.5.4.17181.03%
Other522.98%

SurgeSMTP (1,681 servers)

Version Number of Servers Percent
3.7b8-863137.54%
3.6f5-519611.66%
3.8b-11146.78%
3.5b3-31096.48%
3.7b6-61076.37%
3.0c2-2985.83%
3.8a-8402.38%
2.1c7-7342.02%
2.0g2-1241.43%
1.8g3231.37%
3.6f3-3231.37%
1.6e2231.37%
2.2c10-10191.13%
Other24014.28%

Interscan (1,461 servers)

Version Number of Servers Percent
3.55 (build 1016)34823.82%
3.81-Build_102218612.73%
3.53 (build 2011)1409.58%
3.55 (build 1029)1308.90%
3.8-Build_30131238.42%
3.53 (build 2017)1107.53%
3.53 (build 2013)765.20%
3.55 (build 1020)573.90%
3.52 (build 1375)523.56%
3.53 (build 1493)362.46%
3.8-Build_1080251.71%
3.81-Build_1084151.03%
3.55 (build 1018)151.03%
3.8-Build_3065151.03%
Other1339.10%

Post.Office (1,377 servers)

Version Number of Servers Percent
3.5.350636.75%
3.5.3J14210.31%
3.6.3745.37%
3.8.3735.30%
3.6.2553.99%
3.1.2J473.41%
3.9.1423.05%
3.1.2402.90%
3.8.4352.54%
4.0.1342.47%
3.5.2312.25%
3.9.2292.11%
3.9.0292.11%
3.6.0241.74%
4.0.0.2201.45%
4.0.0.1171.23%
3.8.7.4171.23%
3.9.1.3141.02%
3.6141.02%
3.8.5141.02%
Other1208.71%

InterScan VirusWall (1,326 servers)

Version Number of Servers Percent
Other1,326100.00%

ModusMail (1,280 servers)

Version Number of Servers Percent
4.35.480.092572.27%
4.35.477.0524.06%
4.1.361.21393.05%
3.2.315.0322.50%
4.2.425.16312.42%
4.3.459.0282.19%
3.1.302.0262.03%
4.2.425.22251.95%
4.35.480.11201.56%
3.1.297.0171.33%
4.1.361.0161.25%
Other695.39%

Qmail Toaster (1,028 servers)

Version Number of Servers Percent
1.259057.39%
1.328928.11%
1.014714.30%
Other20.19%

VisNetic (755 servers)

Version Number of Servers Percent
7.2.4.18110.73%
8.0.3.0607.95%
8.3.5.0597.81%
8.5.0.8567.42%
8.5.0.5506.62%
5.8.6.6466.09%
7.6.1.0455.96%
5.0.2.3455.96%
8.3.6445.83%
6.2.2.0435.70%
8.0.3.1364.77%
5.5.8.3324.24%
5.4.5.4222.91%
7.5.3.0212.78%
5.3.5.0162.12%
8.0.3151.99%
5.8.6.4121.59%
8.3.0.1121.59%
6.0.9.091.19%
7.2.4.081.06%
Other435.70%

Mirapoint (488 servers)

Version Number of Servers Percent
3.7.5a-GA7715.78%
3.7.3a-GA6914.14%
3.7.4b-GA489.84%
3.7.5-GA428.61%
3.7.2-GA275.53%
3.8.2-GA275.53%
3.5.8-GR234.71%
3.8.1-FCS224.51%
3.8.0-FCS204.10%
3.7.1-GA193.89%
3.7.0-GA122.46%
1.1.0112.25%
3.5.9-GR91.84%
3.6.4-CR91.84%
3.7.3-GA91.84%
3.6.6-GR91.84%
3.6.5-GR81.64%
3.4.5-GR51.02%
3.4.6-GR51.02%
Other377.58%

MAILsweeper (416 servers)

Version Number of Servers Percent
4.3.17.07217.31%
4.3.12.07117.07%
4.3.19.06515.62%
4.3.14.06415.38%
4.3.20.0419.86%
4.2.10.0225.29%
4.3.1.0184.33%
4.3.10.0163.85%
4.2.5.0153.61%
4.3.6.0143.37%
4.2.1.0143.37%
Other40.96%

Mercury (387 servers)

Version Number of Servers Percent
1.4816843.41%
3.3213334.37%
3.21c287.24%
3.31205.17%
1.44153.88%
1.4782.07%
3.01a61.55%
Other92.33%

WebSTAR V (360 servers)

Version Number of Servers Percent
5.4.110328.61%
5.4.010328.61%
5.3.48423.33%
5.3.3339.17%
5.3.2195.28%
5.3.092.50%
5.3.161.67%
Other30.83%

WebSTAR (173 servers)

Version Number of Servers Percent
Other173100.00%

MessageWall (170 servers)

Version Number of Servers Percent
1.0.813378.24%
1.0.111911.18%
1.1.2374.12%
1.1.042.35%
1.0.631.76%
Other42.35%

Neon Mail Server (158 servers)

Version Number of Servers Percent
3.0.77446.84%
3.0.95937.34%
3.0.8116.96%
3.0.695.70%
3.0.421.27%
3.0.521.27%
Other10.63%

MagicMail (132 servers)

Version Number of Servers Percent
Other132100.00%

OpenVMS (35 servers)

Version Number of Servers Percent
7.31851.43%
8.21028.57%
7.2514.29%
6.125.71%
Other00.00%




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