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Mail (MX) Server Survey
September 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 Queried1,635,456   100.0%
Number of Servers that didn't respond219,04413.39%
    Server didn't open socket211,79812.95%
    Server didn't provide banner7,2460.44%
Server provided banner1,416,41286.61%
Server banner identifies software in use903,07555.22%

As indicated by the above table, of the 1,635,456 servers queried, only 903,075 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
Sendmail306,11633.90%
Microsoft184,37420.42%
Exim152,61916.90%
Postfix111,06712.30%
IMail48,7145.39%
MDaemon20,8092.30%
MailEnable17,6721.96%
Lotus Domino9,1471.01%
Merak8,5660.95%
CommuniGate Pro5,7150.63%
GroupWise4,9420.55%
Trend Micro4,7620.53%
WinWebMail3,7820.42%
Kerio3,6720.41%
ArGoSoft3,2300.36%
XMail2,3540.26%
NetIQ MailMarshal2,0360.23%
Gordano Messaging Suite (GMS)1,8880.21%
Interscan1,6430.18%
SurgeSMTP1,6090.18%
Post.Office1,4850.16%
InterScan VirusWall1,3730.15%
ModusMail1,3110.15%
Qmail Toaster9490.11%
VisNetic7760.09%
MAILsweeper5180.06%
Mirapoint4530.05%
Mercury4220.05%
WebSTAR V3940.04%
MessageWall1890.02%
WebSTAR1880.02%
Neon Mail Server1600.02%
MagicMail1040.01%
OpenVMS360.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (306,116 servers)

Version Number of Servers Percent
8.12.11.2006061454,25317.72%
8.11.651,12516.70%
8.13.633,58610.97%
8.12.1027,1168.86%
8.12.11.2006030825,2128.24%
8.13.118,2455.96%
8.12.1116,4455.37%
8.12.812,8224.19%
8.13.412,2434.00%
8.10.29,0282.95%
8.13.6.200606148,8092.88%
8.9.38,1842.67%
8.13.77,1492.34%
8.13.33,7081.21%
8.12.93,3831.11%
Other14,8084.84%

Microsoft (184,374 servers)

Version Number of Servers Percent
6.0.3790.1830104,79656.84%
5.0.2195.671343,12023.39%
6.0.3790.21122,69612.31%
5.5.2653.133,9822.16%
6.0.3790.03,6731.99%
Other6,1073.31%

Exim (152,619 servers)

Version Number of Servers Percent
4.52110,88872.66%
4.5010,3336.77%
4.606,2824.12%
4.625,7323.76%
4.443,2852.15%
3.362,1091.38%
4.431,9121.25%
3.351,6201.06%
Other10,4586.85%

Postfix (111,067 servers)

Version Number of Servers Percent
Other111,067100.00%

IMail (48,714 servers)

Version Number of Servers Percent
8.1514,21229.17%
6.065,89912.11%
8.055,65811.61%
8.224,8309.92%
8.212,7515.65%
7.152,0464.20%
7.071,9413.98%
9.041,8663.83%
8.201,0572.17%
8.107961.63%
8.147111.46%
8.007071.45%
8.125581.15%
8.025091.04%
8.135081.04%
9.034971.02%
Other4,1688.56%

MDaemon (20,809 servers)

Version Number of Servers Percent
9.0.52,64212.70%
8.1.32,35611.32%
9.0.41,3366.42%
6.8.51,3156.32%
9.0.11,1985.76%
8.1.41,1855.69%
7.2.31,0605.09%
7.2.09514.57%
9.0.09304.47%
8.0.27353.53%
8.1.56222.99%
8.1.15732.75%
8.0.34912.36%
7.1.24772.29%
7.1.04702.26%
7.2.24532.18%
6.8.44192.01%
7.2.13891.87%
8.0.13821.84%
7.0.13721.79%
9.0.63641.75%
Other2,08910.04%

MailEnable (17,672 servers)

Version Number of Servers Percent
1.8--3,09017.49%
1.9--2,33113.19%
1.95--1,3747.78%
1.96--1,1736.64%
0-1.75-1,0936.18%
0-1.54-8124.59%
0-1.6-6583.72%
0-2.11-5313.00%
1.73--4692.65%
0-1.71-3962.24%
0-1.79-3812.16%
0-1.72-3662.07%
1.91--3511.99%
0--2.113271.85%
1.71--3221.82%
1.92--2931.66%
0--1.231801.02%
Other3,52519.95%

Lotus Domino (9,147 servers)

Version Number of Servers Percent
6.5.497710.68%
6.5.195510.44%
7.0.17317.99%
6.5.37007.65%
7.05485.99%
6.5.55095.56%
6.54955.41%
5.0.114374.78%
6.5.24204.59%
5.0.123003.28%
5.0.82502.73%
6.5.4FP22462.69%
5.0.102262.47%
5.0.13a1942.12%
6.0.2CF11862.03%
6.5.4FP11761.92%
6.0.31751.91%
6.01521.66%
7.0.1FP11471.61%
5.0.91241.36%
6.5.4FP31071.17%
6.5.3FP11041.14%
5.0.5991.08%
Other8899.72%

Merak (8,566 servers)

Version Number of Servers Percent
8.0.31,84221.50%
8.5.01,47417.21%
8.3.81,15613.50%
7.4.55105.95%
7.5.23904.55%
7.6.43884.53%
8.2.42963.46%
7.4.22422.83%
7.2.02002.33%
6.2.11631.90%
8.3.01591.86%
7.4.01261.47%
4.4.21241.45%
7.6.11081.26%
5.9.4971.13%
5.5.7931.09%
8.3.6901.05%
5.8.6891.04%
Other1,01911.90%

CommuniGate Pro (5,715 servers)

Version Number of Servers Percent
4.1.895016.62%
5.0.970612.35%
4.2.105699.96%
5.0.82514.39%
4.2.42504.37%
4.2.82033.55%
4.21843.22%
4.3.81813.17%
4.2.91632.85%
4.2.71542.69%
4.0.61422.48%
5.0.61312.29%
4.3.61282.24%
3.5.91111.94%
4.0.1981.71%
4.3.4781.36%
5.1771.35%
4.3.9761.33%
4.2.5761.33%
5.0.1741.29%
4.2.3731.28%
4.3.10691.21%
5.0.2651.14%
5.0.7631.10%
4.2.6631.10%
4.3.7621.08%
4.0.5601.05%
Other65811.51%

GroupWise (4,942 servers)

Version Number of Servers Percent
6.5.490418.29%
7.0.165513.25%
7.052610.64%
6.5.54499.09%
6.0.44368.82%
6.5.13406.88%
6.5.63286.64%
6.5.22154.35%
6.5.31963.97%
6.0.21493.01%
6.0.31302.63%
6.5.01272.57%
5.5.51262.55%
6.0.1931.88%
6.5.7921.86%
Other1763.56%

Trend Micro (4,762 servers)

Version Number of Servers Percent
5.53,22967.81%
5.798120.60%
5.184719.89%
5.15561.18%
Other250.52%

WinWebMail (3,782 servers)

Version Number of Servers Percent
3.6.3.11,09628.98%
3.7.1.196425.49%
3.7.0.565317.27%
3.7.0.757815.28%
3.7.0.343011.37%
3.7.0.1421.11%
Other190.50%

Kerio (3,672 servers)

Version Number of Servers Percent
6.1.464517.57%
6.2.056815.47%
6.1.348113.10%
6.1.236810.02%
6.1.02566.97%
6.0.102005.45%
6.1.11855.04%
6.0.31243.38%
6.0.8902.45%
5.7.10862.34%
6.0.6772.10%
6.0.9701.91%
6.0.7601.63%
5.7.9461.25%
5.7.4391.06%
6.0.1371.01%
Other3409.26%

ArGoSoft (3,230 servers)

Version Number of Servers Percent
1.8 (1.8.8.7)1,28439.75%
1.8 (1.8.8.1)1705.26%
1.8 (1.8.6.0)1384.27%
1.8 (1.8.8.5)1314.06%
1.8 (1.8.8.4)1213.75%
1.8 (1.8.8.2)1173.62%
1.8 (1.8.8.3)1173.62%
1.8 (1.8.8.6)962.97%
1.8 (1.8.7.5)842.60%
1.8 (1.8.5.9)682.11%
1.8 (1.8.7.6)491.52%
1.8 (1.8.6.6)481.49%
1.8 (1.8.7.7)471.46%
1.8 (1.8.7.3)461.42%
1.8 (1.8.8.0)361.11%
Other67820.99%

XMail (2,354 servers)

Version Number of Servers Percent
1.2287837.30%
1.2159425.23%
1.2028011.89%
1.172239.47%
1.18863.65%
1.12743.14%
1.16482.04%
1.10401.70%
1.11311.32%
1.15281.19%
Other723.06%

NetIQ MailMarshal (2,036 servers)

Version Number of Servers Percent
6.0.3.81,44170.78%
5.5.6.71808.84%
6.1.3.15984.81%
5.5.4.16653.19%
5.5.5.9602.95%
5.5.6.6452.21%
5.5.6.5331.62%
5.5.5.6281.38%
5.5.4.17231.13%
Other633.09%

Gordano Messaging Suite (GMS) (1,888 servers)

Version Number of Servers Percent
Other1,888100.00%

Interscan (1,643 servers)

Version Number of Servers Percent
3.55 (build 1016)39323.92%
3.81-Build_102220412.42%
3.53 (build 2011)1609.74%
3.55 (build 1029)1438.70%
3.8-Build_30131328.03%
3.53 (build 2017)1227.43%
3.53 (build 2013)824.99%
3.52 (build 1375)653.96%
3.55 (build 1020)573.47%
3.53 (build 1493)432.62%
3.8-Build_1080342.07%
3.81-Build_1032211.28%
3.55 (build 1018)181.10%
3.8-Build_3065171.03%
3.81-Build_1055171.03%
Other1358.22%

SurgeSMTP (1,609 servers)

Version Number of Servers Percent
3.7b8-853433.19%
3.6f5-524515.23%
3.7b6-61589.82%
3.5b3-31348.33%
3.0c2-21177.27%
2.1c7-7422.61%
3.8a-1372.30%
2.0g2-1281.74%
1.6e2251.55%
3.6f3-3231.43%
1.8g3231.43%
2.2c10-10221.37%
Other22113.74%

Post.Office (1,485 servers)

Version Number of Servers Percent
3.5.356437.98%
3.5.3J15710.57%
3.8.3785.25%
3.6.3765.12%
3.6.2614.11%
3.1.2J483.23%
3.1.2473.16%
3.9.1432.90%
3.8.4382.56%
3.5.2372.49%
3.9.0302.02%
3.9.2291.95%
3.6.0271.82%
4.0.0.2251.68%
4.0.1201.35%
3.6171.14%
3.9.1.3171.14%
4.0.0.1161.08%
3.5.1151.01%
3.5151.01%
Other1258.42%

InterScan VirusWall (1,373 servers)

Version Number of Servers Percent
Other1,373100.00%

ModusMail (1,311 servers)

Version Number of Servers Percent
4.35.480.052640.12%
4.35.477.037028.22%
4.3.459.0796.03%
4.1.361.21614.65%
4.2.425.16382.90%
3.2.315.0372.82%
3.1.302.0272.06%
4.2.425.22261.98%
4.2.407.0231.75%
4.1.361.0191.45%
4.2.425.4171.30%
3.1.297.0161.22%
Other725.49%

Qmail Toaster (949 servers)

Version Number of Servers Percent
1.266069.55%
1.016116.97%
1.312713.38%
Other10.11%

VisNetic (776 servers)

Version Number of Servers Percent
8.3.5.08010.31%
7.2.4.18010.31%
8.0.3.0739.41%
8.5.0.5546.96%
5.8.6.6496.31%
7.6.1.0486.19%
5.0.2.3476.06%
8.3.6476.06%
6.2.2.0465.93%
8.0.3.1455.80%
5.5.8.3303.87%
7.5.3.0222.84%
8.0.3212.71%
5.4.5.4192.45%
5.3.5.0172.19%
5.8.6.4131.68%
8.3.0.1121.55%
6.0.9.0111.42%
7.2.4.0101.29%
5.0.1101.29%
Other425.41%

MAILsweeper (518 servers)

Version Number of Servers Percent
4.3.12.09618.53%
4.3.19.08917.18%
4.3.17.08816.99%
4.3.14.08316.02%
4.3.20.0305.79%
4.2.10.0295.60%
4.3.1.0285.41%
4.2.5.0203.86%
4.3.6.0173.28%
4.3.10.0173.28%
4.2.1.0142.70%
Other71.35%

Mirapoint (453 servers)

Version Number of Servers Percent
3.7.3a-GA6714.79%
3.7.5a-GA459.93%
3.7.4b-GA459.93%
3.7.5-GA429.27%
3.7.1-GA306.62%
3.7.2-GA296.40%
3.5.8-GR265.74%
3.8.0-FCS235.08%
3.8.1-FCS163.53%
3.7.0-GA153.31%
3.7.3-GA153.31%
3.6.5-GR122.65%
1.1.0102.21%
3.6.6-GR91.99%
3.5.9-GR71.55%
3.6.4-CR61.32%
3.5.7-GR61.32%
3.4.5-GR51.10%
Other459.93%

Mercury (422 servers)

Version Number of Servers Percent
1.4819045.02%
3.3214133.41%
3.21c348.06%
3.31204.74%
1.44143.32%
1.4781.90%
3.01a71.66%
Other81.90%

WebSTAR V (394 servers)

Version Number of Servers Percent
5.4.011529.19%
5.4.111027.92%
5.3.48722.08%
5.3.3379.39%
5.3.2276.85%
5.3.082.03%
5.3.161.52%
Other41.02%

MessageWall (189 servers)

Version Number of Servers Percent
1.0.815179.89%
1.0.11178.99%
1.1.2373.70%
1.1.052.65%
1.0.631.59%
1.0.921.06%
Other42.12%

WebSTAR (188 servers)

Version Number of Servers Percent
Other188100.00%

Neon Mail Server (160 servers)

Version Number of Servers Percent
3.0.78955.62%
3.0.94729.38%
3.0.8116.88%
3.0.685.00%
3.0.421.25%
3.0.521.25%
Other10.62%

MagicMail (104 servers)

Version Number of Servers Percent
Other104100.00%

OpenVMS (36 servers)

Version Number of Servers Percent
7.31644.44%
8.2925.00%
7.2719.44%
6.125.56%
7.125.56%
Other00.00%




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