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Mail (MX) Server Survey
October 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 Queried1,644,877   100.0%
Number of Servers that didn't respond226,81113.79%
    Server didn't open socket219,26113.33%
    Server didn't provide banner7,5500.46%
Server provided banner1,418,06686.21%
Server banner identifies software in use903,00154.90%

As indicated by the above table, of the 1,644,877 servers queried, only 903,001 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
Sendmail302,18433.46%
Microsoft185,31920.52%
Exim155,32217.20%
Postfix112,57412.47%
IMail47,8815.30%
MDaemon20,8702.31%
MailEnable17,7901.97%
Lotus Domino8,9861.00%
Merak8,5130.94%
CommuniGate Pro5,6340.62%
GroupWise4,8260.53%
Trend Micro4,7890.53%
WinWebMail3,9230.43%
Kerio3,7520.42%
ArGoSoft3,2240.36%
XMail2,3460.26%
NetIQ MailMarshal1,8780.21%
Gordano Messaging Suite (GMS)1,8210.20%
SurgeSMTP1,6240.18%
Interscan1,5670.17%
Post.Office1,4370.16%
InterScan VirusWall1,3570.15%
ModusMail1,2570.14%
Qmail Toaster9840.11%
VisNetic7560.08%
MAILsweeper4750.05%
Mirapoint4740.05%
Mercury4090.05%
WebSTAR V3690.04%
WebSTAR1800.02%
MessageWall1760.02%
Neon Mail Server1510.02%
MagicMail1180.01%
OpenVMS350.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (302,184 servers)

Version Number of Servers Percent
8.12.11.2006061453,34017.65%
8.11.645,99015.22%
8.13.630,1329.97%
8.12.11.2006030829,7709.85%
8.12.1025,8388.55%
8.13.118,6156.16%
8.12.1115,9475.28%
8.12.812,2554.06%
8.13.411,7073.87%
8.13.6.200606148,9502.96%
8.10.28,6432.86%
8.9.37,8722.61%
8.13.77,5642.50%
8.13.84,5391.50%
8.13.33,5921.19%
8.12.93,2771.08%
Other14,1534.68%

Microsoft (185,319 servers)

Version Number of Servers Percent
6.0.3790.1830109,13758.89%
5.0.2195.671341,60222.45%
6.0.3790.21121,65011.68%
5.5.2653.133,6701.98%
6.0.3790.03,4551.86%
Other5,8053.13%

Exim (155,322 servers)

Version Number of Servers Percent
4.52113,42673.03%
4.5010,3336.65%
4.606,4744.17%
4.624,3962.83%
4.443,2012.06%
4.632,8191.81%
3.362,0401.31%
4.431,7601.13%
Other10,8737.00%

Postfix (112,574 servers)

Version Number of Servers Percent
Other112,574100.00%

IMail (47,881 servers)

Version Number of Servers Percent
8.1513,50528.21%
6.065,75612.02%
8.225,39811.27%
8.055,37111.22%
8.212,2664.73%
9.042,1114.41%
7.152,0214.22%
7.071,8013.76%
8.201,0202.13%
8.107351.54%
8.007171.50%
8.147061.47%
9.106441.35%
8.125401.13%
8.024951.03%
8.134901.02%
Other4,3058.99%

MDaemon (20,870 servers)

Version Number of Servers Percent
9.0.62,94614.12%
8.1.32,20110.55%
9.0.41,3866.64%
6.8.51,2495.98%
8.1.41,0695.12%
9.0.11,0525.04%
9.0.51,0475.02%
7.2.31,0164.87%
7.2.09154.38%
9.0.07663.67%
8.0.26903.31%
8.1.55662.71%
8.1.15522.64%
8.0.35512.64%
7.1.24672.24%
7.1.04642.22%
7.2.24332.07%
6.8.44101.96%
8.0.13631.74%
7.2.13621.73%
7.0.13331.60%
Other2,0329.74%

MailEnable (17,790 servers)

Version Number of Servers Percent
1.8--2,96416.66%
1.9--2,36513.29%
1.95--1,5838.90%
1.96--1,1666.55%
0-1.75-9605.40%
0-1.54-7794.38%
0-1.6-7204.05%
0-1.79-5112.87%
0-2.11-4852.73%
1.73--4592.58%
0-1.71-3812.14%
0-1.72-3301.85%
1.91--3281.84%
1.71--2981.68%
0-2.2-2601.46%
1.92--2541.43%
0--2.112341.32%
Other3,71320.87%

Lotus Domino (8,986 servers)

Version Number of Servers Percent
6.5.494310.49%
6.5.190810.10%
7.0.17958.85%
6.5.36747.50%
7.05506.12%
6.5.55065.63%
6.54685.21%
5.0.114224.70%
6.5.24114.57%
5.0.122813.13%
6.5.4FP22332.59%
5.0.82322.58%
7.0.1FP12222.47%
5.0.102162.40%
5.0.13a1781.98%
6.0.2CF11731.93%
6.5.4FP11691.88%
6.0.31581.76%
6.01421.58%
6.5.5FP11241.38%
5.0.91201.34%
5.0.51001.11%
6.5.3FP11001.11%
6.5.4FP3941.05%
Other7678.54%

Merak (8,513 servers)

Version Number of Servers Percent
8.5.01,87322.00%
8.0.31,84621.68%
8.3.890610.64%
7.4.54785.61%
7.6.43784.44%
7.5.23524.13%
8.2.42793.28%
7.4.22372.78%
7.2.02032.38%
6.2.11511.77%
8.3.01461.72%
7.4.01201.41%
4.4.21151.35%
7.6.11011.19%
5.5.7901.06%
Other1,23814.54%

CommuniGate Pro (5,634 servers)

Version Number of Servers Percent
4.1.892816.47%
5.0.968112.09%
4.2.105599.92%
5.0.82444.33%
4.2.42394.24%
4.2.81923.41%
4.21713.04%
4.3.81642.91%
4.2.91522.70%
4.2.71412.50%
4.0.61392.47%
5.11252.22%
5.0.101242.20%
4.3.61232.18%
5.0.61152.04%
3.5.91051.86%
4.0.1971.72%
4.3.4731.30%
4.2.5711.26%
4.2.3691.22%
4.3.9681.21%
5.0.1681.21%
4.2.6621.10%
5.0.7601.06%
4.3.7601.06%
4.0.5581.03%
Other74613.24%

GroupWise (4,826 servers)

Version Number of Servers Percent
7.0.185317.68%
6.5.483517.30%
7.04348.99%
6.5.54128.54%
6.0.44028.33%
6.5.63226.67%
6.5.13056.32%
6.5.21984.10%
6.5.31903.94%
6.0.21412.92%
6.5.71322.74%
6.0.31212.51%
6.5.01152.38%
5.5.51142.36%
6.0.1921.91%
Other1603.32%

Trend Micro (4,789 servers)

Version Number of Servers Percent
5.53,11365.00%
5.71,11723.32%
5.1848110.04%
5.15561.17%
Other220.46%

WinWebMail (3,923 servers)

Version Number of Servers Percent
3.7.1.11,12428.65%
3.6.3.11,07427.38%
3.7.0.566116.85%
3.7.0.758014.78%
3.7.0.342610.86%
Other581.48%

Kerio (3,752 servers)

Version Number of Servers Percent
6.2.069718.58%
6.1.443711.65%
6.1.33759.99%
6.2.13419.09%
6.1.23308.80%
6.1.02526.72%
6.0.101834.88%
6.1.11574.18%
6.0.31163.09%
5.7.10832.21%
6.0.6832.21%
6.0.8802.13%
6.0.9711.89%
6.0.7591.57%
5.7.9421.12%
Other44611.89%

ArGoSoft (3,224 servers)

Version Number of Servers Percent
1.8 (1.8.8.7)1,08933.78%
1.8 (1.8.8.8)34910.83%
1.8 (1.8.8.1)1584.90%
1.8 (1.8.6.0)1314.06%
1.8 (1.8.8.5)1143.54%
1.8 (1.8.8.2)1123.47%
1.8 (1.8.8.3)1103.41%
1.8 (1.8.8.4)962.98%
1.8 (1.8.7.5)732.26%
1.8 (1.8.8.6)722.23%
1.8 (1.8.5.9)652.02%
1.8 (1.8.6.6)491.52%
1.8 (1.8.7.6)471.46%
1.8 (1.8.7.3)421.30%
1.8 (1.8.7.7)371.15%
Other68021.09%

XMail (2,346 servers)

Version Number of Servers Percent
1.2294040.07%
1.2155923.83%
1.2025610.91%
1.172259.59%
1.18813.45%
1.12733.11%
1.16482.05%
1.10371.58%
1.11281.19%
1.15261.11%
Other733.11%

NetIQ MailMarshal (1,878 servers)

Version Number of Servers Percent
6.0.3.81,31570.02%
5.5.6.71799.53%
6.1.3.15955.06%
5.5.4.16593.14%
5.5.5.9522.77%
5.5.6.6412.18%
5.5.6.5341.81%
5.5.5.6271.44%
5.5.4.17201.06%
Other562.98%

Gordano Messaging Suite (GMS) (1,821 servers)

Version Number of Servers Percent
Other1,821100.00%

SurgeSMTP (1,624 servers)

Version Number of Servers Percent
3.7b8-851031.40%
3.6f5-522013.55%
3.7b6-61468.99%
3.5b3-31237.57%
3.8b-11167.14%
3.0c2-21036.34%
3.8a-8412.52%
2.1c7-7352.16%
1.6e2241.48%
1.8g3231.42%
3.6f3-3231.42%
2.0g2-1221.35%
2.2c10-10211.29%
Other21713.36%

Interscan (1,567 servers)

Version Number of Servers Percent
3.55 (build 1016)37123.68%
3.81-Build_102220012.76%
3.53 (build 2011)1539.76%
3.55 (build 1029)1368.68%
3.8-Build_30131268.04%
3.53 (build 2017)1177.47%
3.53 (build 2013)815.17%
3.52 (build 1375)553.51%
3.55 (build 1020)533.38%
3.53 (build 1493)432.74%
3.8-Build_1080322.04%
3.81-Build_1032171.08%
3.55 (build 1018)171.08%
3.81-Build_1055161.02%
3.8-Build_3065161.02%
3.81-Build_1084161.02%
Other1187.53%

Post.Office (1,437 servers)

Version Number of Servers Percent
3.5.353837.44%
3.5.3J15010.44%
3.8.3775.36%
3.6.3725.01%
3.6.2594.11%
3.1.2J513.55%
3.9.1432.99%
3.1.2412.85%
3.8.4372.57%
3.5.2352.44%
3.9.0302.09%
3.9.2292.02%
4.0.1261.81%
3.6.0261.81%
4.0.0.2241.67%
3.6161.11%
3.5.1151.04%
4.0.0.1151.04%
3.8.7.4151.04%
3.9.1.3151.04%
Other1238.56%

InterScan VirusWall (1,357 servers)

Version Number of Servers Percent
Other1,357100.00%

ModusMail (1,257 servers)

Version Number of Servers Percent
4.35.480.077961.97%
4.35.477.0796.28%
4.1.361.21594.69%
4.3.459.0503.98%
4.35.480.11473.74%
4.2.425.16352.78%
3.2.315.0302.39%
4.2.425.22262.07%
3.1.302.0251.99%
4.2.407.0251.99%
4.1.361.0191.51%
3.1.297.0171.35%
Other665.25%

Qmail Toaster (984 servers)

Version Number of Servers Percent
1.262363.31%
1.320420.73%
1.015615.85%
Other10.10%

VisNetic (756 servers)

Version Number of Servers Percent
7.2.4.18210.85%
8.0.3.0648.47%
8.3.5.0618.07%
8.5.0.5597.80%
7.6.1.0476.22%
5.8.6.6466.08%
8.3.6455.95%
5.0.2.3455.95%
6.2.2.0425.56%
8.0.3.1395.16%
5.5.8.3314.10%
8.5.0.8293.84%
7.5.3.0222.91%
8.0.3202.65%
5.4.5.4172.25%
5.8.6.4151.98%
5.3.5.0151.98%
8.3.0.1141.85%
6.0.9.0101.32%
7.2.4.091.19%
Other445.82%

MAILsweeper (475 servers)

Version Number of Servers Percent
4.3.12.08417.68%
4.3.17.08117.05%
4.3.19.08016.84%
4.3.14.07716.21%
4.3.20.0377.79%
4.2.10.0255.26%
4.3.1.0245.05%
4.2.5.0173.58%
4.3.10.0163.37%
4.3.6.0153.16%
4.2.1.0142.95%
Other51.05%

Mirapoint (474 servers)

Version Number of Servers Percent
3.7.3a-GA6714.14%
3.7.5a-GA6513.71%
3.7.4b-GA469.70%
3.7.5-GA449.28%
3.8.1-FCS296.12%
3.7.2-GA275.70%
3.5.8-GR265.49%
3.7.1-GA255.27%
3.8.0-FCS234.85%
3.7.0-GA132.74%
3.7.3-GA122.53%
3.6.5-GR122.53%
1.1.0102.11%
3.6.6-GR91.90%
3.6.4-CR81.69%
3.5.9-GR71.48%
3.4.5-GR51.05%
3.5.7-GR51.05%
Other418.65%

Mercury (409 servers)

Version Number of Servers Percent
1.4818444.99%
3.3213533.01%
3.21c327.82%
3.31204.89%
1.44163.91%
1.4781.96%
3.01a61.47%
Other81.96%

WebSTAR V (369 servers)

Version Number of Servers Percent
5.4.010628.73%
5.4.110528.46%
5.3.48222.22%
5.3.3359.49%
5.3.2246.50%
5.3.092.44%
5.3.161.63%
Other20.54%

WebSTAR (180 servers)

Version Number of Servers Percent
Other180100.00%

MessageWall (176 servers)

Version Number of Servers Percent
1.0.814180.11%
1.0.11158.52%
1.1.2373.98%
1.1.052.84%
1.0.631.70%
Other52.84%

Neon Mail Server (151 servers)

Version Number of Servers Percent
3.0.77549.67%
3.0.95133.77%
3.0.8117.28%
3.0.695.96%
3.0.421.32%
3.0.521.32%
Other10.66%

MagicMail (118 servers)

Version Number of Servers Percent
Other118100.00%

OpenVMS (35 servers)

Version Number of Servers Percent
7.31440.00%
8.21028.57%
7.2720.00%
6.125.71%
7.125.71%
Other00.00%




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