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Mail (MX) Server Survey
June 1st, 2007

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 Queried1,731,835   100.0%
Number of Servers that didn't respond247,40714.29%
    Server didn't open socket238,66013.78%
    Server didn't provide banner8,7470.51%
Server provided banner1,484,42885.71%
Server banner identifies software in use915,10552.84%

As indicated by the above table, of the 1,731,835 servers queried, only 915,105 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
Sendmail277,13930.28%
Microsoft198,31321.67%
Exim177,12819.36%
Postfix130,05214.21%
IMail32,5143.55%
MDaemon22,0632.41%
MailEnable20,4142.23%
Merak8,7870.96%
Lotus Domino7,8820.86%
CommuniGate Pro5,1760.57%
Trend Micro4,7680.52%
Kerio4,6060.50%
WinWebMail4,4490.49%
GroupWise3,8640.42%
ArGoSoft3,0780.34%
XMail2,5620.28%
SurgeSMTP1,7530.19%
Gordano Messaging Suite (GMS)1,4190.16%
Qmail Toaster1,3730.15%
Post.Office1,1980.13%
NetIQ MailMarshal1,1690.13%
InterScan VirusWall1,1290.12%
Interscan9510.10%
VisNetic6460.07%
Mirapoint5570.06%
ModusMail5540.06%
Mercury3060.03%
WebSTAR V2950.03%
MagicMail2770.03%
MAILsweeper2130.02%
Neon Mail Server1870.02%
MessageWall1250.01%
WebSTAR1230.01%
OpenVMS350.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (277,139 servers)

Version Number of Servers Percent
8.12.11.2006061447,89017.28%
8.12.11.2006030833,77812.19%
8.11.629,39810.61%
8.13.627,5179.93%
8.13.125,5299.21%
8.12.1020,3457.34%
8.13.815,5075.60%
8.12.1112,4294.48%
8.13.6.2006061410,1133.65%
8.13.49,8003.54%
8.12.88,9693.24%
8.13.76,1692.23%
8.10.25,7782.08%
8.9.35,4921.98%
8.13.32,8351.02%
Other15,5905.63%

Microsoft (198,313 servers)

Version Number of Servers Percent
6.0.3790.1830113,84657.41%
6.0.3790.395931,33415.80%
5.0.2195.671330,38715.32%
6.0.3790.21114,6717.40%
6.0.3790.02,1041.06%
5.5.2653.132,0061.01%
Other3,9652.00%

Exim (177,128 servers)

Version Number of Servers Percent
4.63117,46966.32%
4.6611,9196.73%
4.5210,6185.99%
4.509,5875.41%
4.607,8014.40%
4.624,0462.28%
4.442,8321.60%
Other12,8567.26%

Postfix (130,052 servers)

Version Number of Servers Percent
Other130,052100.00%

IMail (32,514 servers)

Version Number of Servers Percent
8.156,19819.06%
8.226,12418.83%
8.054,09112.58%
9.103,0949.52%
9.202,0816.40%
7.071,3424.13%
7.151,3274.08%
6.061,0953.37%
8.219392.89%
8.006311.94%
9.045681.75%
8.205131.58%
8.104541.40%
8.024001.23%
8.133611.11%
8.123531.09%
8.013271.01%
Other2,6168.05%

MDaemon (22,063 servers)

Version Number of Servers Percent
9.5.65,41724.55%
8.1.31,4396.52%
9.0.41,2385.61%
6.8.58994.07%
9.5.48793.98%
9.5.57943.60%
7.2.37523.41%
7.2.06663.02%
9.5.16562.97%
9.5.26382.89%
9.0.16122.77%
9.5.35812.63%
8.1.45692.58%
8.0.25102.31%
9.0.05062.29%
9.0.64582.08%
8.0.34261.93%
8.1.14081.85%
9.0.73851.75%
7.1.23451.56%
8.1.53381.53%
7.1.03151.43%
7.2.23021.37%
7.2.12691.22%
8.0.12571.16%
6.8.42551.16%
7.0.12551.16%
9.0.52321.05%
Other1,6627.53%

MailEnable (20,414 servers)

Version Number of Servers Percent
1.981--3,76318.43%
1.96--2,16910.63%
1.8--1,7598.62%
1.95--1,7018.33%
1.9--1,6998.32%
0-2.37-1,6037.85%
0-1.85-1,0955.36%
0--2.378974.39%
0-2.36-7713.78%
0-1.841-3621.77%
0--2.363091.51%
0-1.54-2601.27%
0-1.75-2601.27%
1.73--2351.15%
0-2.32-2061.01%
Other3,32516.29%

Merak (8,787 servers)

Version Number of Servers Percent
8.9.12,12524.18%
8.0.32,03523.16%
8.5.08749.95%
8.3.83944.48%
7.4.53844.37%
7.5.23393.86%
7.6.43013.43%
8.9.01952.22%
7.4.21942.21%
7.2.01631.86%
8.2.41601.82%
6.2.11121.27%
8.3.01071.22%
7.4.0991.13%
Other1,30514.85%

Lotus Domino (7,882 servers)

Version Number of Servers Percent
7.0.291811.65%
6.5.46708.50%
7.0.16488.22%
6.5.15867.43%
6.5.34776.05%
7.0.2FP14655.90%
6.5.54315.47%
7.03924.97%
6.53384.29%
6.5.22613.31%
5.0.112533.21%
6.5.5FP21892.40%
5.0.121802.28%
7.0.1FP11672.12%
5.0.81531.94%
5.0.101471.87%
5.0.13a1361.73%
6.5.4FP21161.47%
6.5.4FP31111.41%
6.0.2CF11041.32%
6.0.31001.27%
6.0971.23%
6.5.5FP1871.10%
6.5.4FP1801.01%
5.0.9801.01%
Other6968.83%

CommuniGate Pro (5,176 servers)

Version Number of Servers Percent
4.1.868813.29%
4.2.105019.68%
5.1.73015.82%
5.1.82995.78%
5.0.92905.60%
5.0.131763.40%
5.1.51332.57%
4.2.81302.51%
4.2.71222.36%
5.0.81202.32%
5.1.31192.30%
5.0.111162.24%
4.21152.22%
5.1.61082.09%
4.2.91021.97%
4.3.121021.97%
4.3.8981.89%
4.0.1941.82%
4.0.6891.72%
5.1.4741.43%
3.5.9711.37%
5.1.2711.37%
5.0.10611.18%
5.1.1591.14%
5.0.6591.14%
4.2.4551.06%
Other1,02319.76%

Trend Micro (4,768 servers)

Version Number of Servers Percent
5.52,24547.08%
5.71,96941.30%
5.1848010.07%
Other741.55%

Kerio (4,606 servers)

Version Number of Servers Percent
6.3.11,95442.42%
6.3.052911.49%
6.2.22294.97%
6.1.31813.93%
6.1.21803.91%
6.2.01783.86%
6.1.01643.56%
6.1.41383.00%
6.0.101332.89%
6.0.3911.98%
6.1.1871.89%
6.4.0701.52%
6.2.1621.35%
6.0.8601.30%
5.7.10561.22%
6.0.9551.19%
Other4399.53%

WinWebMail (4,449 servers)

Version Number of Servers Percent
3.7.3.11,27328.61%
3.7.1.11,09524.61%
3.6.3.177917.51%
3.7.0.552011.69%
3.7.0.74039.06%
3.7.0.33287.37%
Other511.15%

GroupWise (3,864 servers)

Version Number of Servers Percent
7.0.11,15329.84%
6.5.743111.15%
6.5.440510.48%
7.0.22596.70%
6.0.42576.65%
6.5.62396.19%
7.02175.62%
6.5.51945.02%
6.5.11644.24%
6.5.3822.12%
6.5.2802.07%
6.0.2792.04%
6.0.3711.84%
5.5.5631.63%
6.5.0461.19%
6.0.1451.16%
Other792.04%

ArGoSoft (3,078 servers)

Version Number of Servers Percent
1.8 (1.8.8.8)69222.48%
1.8 (1.8.8.7)46315.04%
1.8 (1.8.9.1)34311.14%
1.8 (1.8.8.9)30910.04%
1.8 (1.8.9.0)1735.62%
1.8 (1.8.8.1)902.92%
1.8 (1.8.6.0)812.63%
1.8 (1.8.8.2)642.08%
1.8 (1.8.8.3)632.05%
1.8 (1.8.8.5)541.75%
1.8 (1.8.5.9)491.59%
1.8 (1.8.8.4)441.43%
1.8 (1.8.7.5)441.43%
1.8 (1.8.8.9 431.40%
1.8 (1.8.6.6)341.10%
1.8 (1.8.8.6)321.04%
Other50016.24%

XMail (2,562 servers)

Version Number of Servers Percent
1.2295037.08%
1.2142716.67%
1.2431712.37%
1.202168.43%
1.171837.14%
1.231445.62%
1.12853.32%
1.18582.26%
1.16391.52%
1.10301.17%
1.15261.01%
Other873.40%

SurgeSMTP (1,753 servers)

Version Number of Servers Percent
3.8i-138822.13%
3.8f3-336320.71%
3.7b8-823913.63%
3.8f2-21669.47%
3.6f5-51247.07%
3.5b3-3744.22%
3.0c2-2613.48%
3.7b6-6522.97%
3.8g-21261.48%
2.1c7-7261.48%
2.0g2-1231.31%
1.8g3181.03%
Other19311.01%

Gordano Messaging Suite (GMS) (1,419 servers)

Version Number of Servers Percent
Other1,419100.00%

Qmail Toaster (1,373 servers)

Version Number of Servers Percent
1.377456.37%
1.248535.32%
1.01138.23%
Other10.07%

Post.Office (1,198 servers)

Version Number of Servers Percent
3.5.336930.80%
3.5.3J1018.43%
4.0.1776.43%
3.8.3746.18%
3.6.3665.51%
3.6.2463.84%
3.1.2J453.76%
3.9.1433.59%
3.1.2332.75%
3.9.2.3312.59%
3.9.2292.42%
3.9.0282.34%
3.5.2262.17%
3.8.4242.00%
4.0.0.2231.92%
3.8.7.4221.84%
3.6.0211.75%
3.9.1.3131.09%
4.0.0.1121.00%
Other1159.60%

NetIQ MailMarshal (1,169 servers)

Version Number of Servers Percent
6.0.3.886473.91%
5.5.6.7806.84%
6.1.3.15534.53%
5.5.5.9322.74%
5.5.4.16302.57%
5.5.6.6272.31%
5.5.6.5242.05%
5.5.5.6131.11%
Other463.93%

InterScan VirusWall (1,129 servers)

Version Number of Servers Percent
Other1,129100.00%

Interscan (951 servers)

Version Number of Servers Percent
3.55 (build 1016)20821.87%
3.81-Build_102212312.93%
3.8-Build_301310010.52%
3.55 (build 1029)869.04%
3.53 (build 2011)858.94%
3.53 (build 2017)727.57%
3.53 (build 2013)424.42%
3.55 (build 1020)343.58%
3.53 (build 1493)313.26%
3.52 (build 1375)262.73%
3.8-Build_1080202.10%
3.81-Build_1084131.37%
3.8-Build_3065131.37%
Other9810.30%

VisNetic (646 servers)

Version Number of Servers Percent
8.5.0.812419.20%
7.2.4.1588.98%
8.0.3.0426.50%
5.8.6.6426.50%
5.0.2.3375.73%
8.3.5.0365.57%
6.2.2.0365.57%
8.0.3.1365.57%
7.6.1.0294.49%
5.5.8.3294.49%
8.3.6253.87%
8.0.3192.94%
5.4.5.4172.63%
8.5.0.5152.32%
5.3.5.0142.17%
7.5.3.0132.01%
8.3.0.1101.55%
7.2.4.091.39%
5.8.6.471.08%
5.0.171.08%
Other416.35%

Mirapoint (557 servers)

Version Number of Servers Percent
3.8.3-GA13023.34%
3.7.5a-GA10418.67%
3.8.2-GA7513.46%
3.7.3a-GA397.00%
3.7.4b-GA356.28%
3.8.4-GA346.10%
3.7.5-GA244.31%
3.7.2-GA173.05%
3.5.8-GR132.33%
3.7.1-GA132.33%
1.1.0101.80%
3.6.6-GR81.44%
3.7.0-GA81.44%
3.7.3-GA71.26%
Other407.18%

ModusMail (554 servers)

Version Number of Servers Percent
4.35.480.034462.09%
3.2.315.0356.32%
4.1.361.21285.05%
4.2.425.22274.87%
4.35.477.0213.79%
3.1.297.0173.07%
4.35.480.11111.99%
3.1.302.0111.99%
4.3.459.0101.81%
3.0.273.091.62%
4.2.425.461.08%
Other356.32%

Mercury (306 servers)

Version Number of Servers Percent
1.4813544.12%
3.3210634.64%
3.21c247.84%
3.31144.58%
1.44134.25%
1.4772.29%
Other72.29%

WebSTAR V (295 servers)

Version Number of Servers Percent
5.4.08729.49%
5.4.18328.14%
5.3.46221.02%
5.3.3299.83%
5.3.2217.12%
5.3.093.05%
5.2.431.02%
Other10.34%

MagicMail (277 servers)

Version Number of Servers Percent
Other277100.00%

MAILsweeper (213 servers)

Version Number of Servers Percent
4.3.20.03918.31%
4.3.12.03516.43%
4.3.17.03215.02%
4.3.19.03014.08%
4.3.14.02712.68%
4.2.10.0115.16%
4.2.1.094.23%
4.3.1.083.76%
4.3.10.083.76%
4.3.6.073.29%
4.2.5.041.88%
Other31.41%

Neon Mail Server (187 servers)

Version Number of Servers Percent
3.0.98042.78%
3.0.76132.62%
3.1.02412.83%
3.0.8105.35%
3.0.694.81%
3.0.421.07%
Other10.53%

MessageWall (125 servers)

Version Number of Servers Percent
1.0.89777.60%
1.0.111612.80%
1.1.2375.60%
1.0.621.60%
1.1.021.60%
Other10.80%

WebSTAR (123 servers)

Version Number of Servers Percent
Other123100.00%

OpenVMS (35 servers)

Version Number of Servers Percent
7.31337.14%
8.2925.71%
8.3720.00%
7.2514.29%
6.112.86%
Other00.00%




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