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Mail (MX) Server Survey
October 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 Queried1,759,849   100.0%
Number of Servers that didn't respond264,29615.02%
    Server didn't open socket254,25714.45%
    Server didn't provide banner10,0390.57%
Server provided banner1,495,55384.98%
Server banner identifies software in use907,14051.55%

As indicated by the above table, of the 1,759,849 servers queried, only 907,140 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
Sendmail259,74728.63%
Microsoft199,71622.02%
Exim183,77820.26%
Postfix136,45015.04%
IMail29,2343.22%
MDaemon22,1132.44%
MailEnable21,3342.35%
Merak8,4800.93%
Lotus Domino7,4260.82%
CommuniGate Pro5,1670.57%
Kerio4,9350.54%
WinWebMail4,4430.49%
Trend Micro4,1480.46%
GroupWise3,4370.38%
ArGoSoft2,8990.32%
XMail2,5360.28%
SurgeSMTP1,8320.20%
Qmail Toaster1,4880.16%
Gordano Messaging Suite (GMS)1,2950.14%
Post.Office1,0800.12%
NetIQ MailMarshal9390.10%
InterScan VirusWall9200.10%
Interscan7800.09%
VisNetic5810.06%
Mirapoint5540.06%
ModusMail4390.05%
MagicMail3030.03%
WebSTAR V2520.03%
Mercury2370.03%
Neon Mail Server1830.02%
MAILsweeper1520.02%
MessageWall1150.01%
WebSTAR1110.01%
OpenVMS360.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (259,747 servers)

Version Number of Servers Percent
8.12.11.2006061443,62816.80%
8.12.11.2006030832,34112.45%
8.13.126,23510.10%
8.11.625,0809.66%
8.13.624,9029.59%
8.12.1017,5446.75%
8.13.814,9455.75%
8.12.1110,6944.12%
8.13.6.2006061410,2163.93%
8.13.48,7963.39%
8.14.18,4033.24%
8.12.87,6972.96%
8.13.75,8882.27%
8.10.24,5821.76%
8.9.34,5401.75%
Other14,2565.49%

Microsoft (199,716 servers)

Version Number of Servers Percent
6.0.3790.395986,69143.41%
6.0.3790.183070,49635.30%
5.0.2195.671325,15212.59%
6.0.3790.21110,9065.46%
Other6,4713.24%

Exim (183,778 servers)

Version Number of Servers Percent
4.6880,74343.94%
4.6346,58425.35%
4.6618,0369.81%
4.508,3644.55%
4.607,6234.15%
4.674,4732.43%
4.523,9902.17%
4.623,9302.14%
Other10,0355.46%

Postfix (136,450 servers)

Version Number of Servers Percent
Other136,450100.00%

IMail (29,234 servers)

Version Number of Servers Percent
8.225,58719.11%
8.155,05017.27%
8.053,27011.19%
9.102,5468.71%
9.212,0126.88%
9.201,6135.52%
7.151,2114.14%
7.071,2084.13%
6.068943.06%
8.216932.37%
8.006462.21%
8.104411.51%
8.204301.47%
8.123241.11%
8.023181.09%
8.042931.00%
Other2,6989.23%

MDaemon (22,113 servers)

Version Number of Servers Percent
9.6.24,42320.00%
9.5.61,8608.41%
9.6.11,5026.79%
8.1.31,2495.65%
9.0.41,1065.00%
6.8.57603.44%
9.5.27023.17%
9.5.16713.03%
7.2.36663.01%
9.6.05732.59%
7.2.05512.49%
9.0.15312.40%
9.5.54922.22%
9.5.44912.22%
8.1.44652.10%
9.0.04442.01%
8.0.24311.95%
9.5.33671.66%
8.1.13641.65%
7.1.23061.38%
8.1.53021.37%
8.0.32981.35%
9.0.72911.32%
7.1.02671.21%
7.2.22541.15%
9.0.62441.10%
7.2.12371.07%
6.8.42271.03%
Other2,0399.22%

MailEnable (21,334 servers)

Version Number of Servers Percent
1.981--4,62421.67%
1.96--2,0129.43%
1.95--1,6397.68%
1.9--1,5327.18%
1.8--1,4496.79%
0-2.37-1,3746.44%
0-1.85-1,1055.18%
0-2.38-9534.47%
1.983--9094.26%
0--2.376583.08%
0-2.36-6132.87%
0--2.385762.70%
0-1.841-2811.32%
Other3,60916.92%

Merak (8,480 servers)

Version Number of Servers Percent
8.0.31,97423.28%
8.9.11,60618.94%
9.0.01,00411.84%
8.5.06737.94%
8.3.83394.00%
7.4.53363.96%
7.5.23093.64%
7.6.42793.29%
7.4.21712.02%
7.2.01411.66%
8.9.01371.62%
8.2.41311.54%
6.2.1901.06%
Other1,29015.21%

Lotus Domino (7,426 servers)

Version Number of Servers Percent
7.0.294312.70%
7.0.15507.41%
6.5.45487.38%
6.5.15196.99%
7.0.2FP24566.14%
6.5.34065.47%
6.5.53654.92%
7.03474.67%
7.0.2FP13474.67%
6.52853.84%
6.5.22212.98%
5.0.112162.91%
5.0.121471.98%
7.0.1FP11311.76%
6.5.5FP21281.72%
5.0.81271.71%
5.0.101201.62%
5.0.13a1151.55%
6.0.2CF11011.36%
8.0991.33%
6.5.4FP3891.20%
6.5.4FP2871.17%
6.0821.10%
6.0.3801.08%
Other91712.35%

CommuniGate Pro (5,167 servers)

Version Number of Servers Percent
4.1.862812.15%
4.2.104268.24%
5.1.112725.26%
5.1.102615.05%
5.0.92144.14%
5.1.92074.01%
5.1.122013.89%
5.0.131883.64%
5.1.81593.08%
5.1.71542.98%
4.3.121232.38%
4.2.81162.25%
4.21072.07%
4.2.71052.03%
5.0.81011.95%
4.0.1951.84%
5.0.11931.80%
4.2.9921.78%
5.1.3831.61%
5.1.5831.61%
4.0.6781.51%
5.1.6731.41%
5.1.4641.24%
4.3.8611.18%
5.1.2601.16%
3.5.9571.10%
5.1.1531.03%
Other1,01319.61%

Kerio (4,935 servers)

Version Number of Servers Percent
6.3.11,08922.07%
6.4.11,04521.18%
6.4.092418.72%
6.3.03386.85%
6.2.21603.24%
6.1.31322.67%
6.1.21292.61%
6.2.01292.61%
6.1.01252.53%
6.0.101042.11%
6.1.41002.03%
6.0.3781.58%
6.1.1621.26%
6.0.8541.09%
6.2.1521.05%
Other4148.39%

WinWebMail (4,443 servers)

Version Number of Servers Percent
3.7.3.11,74939.37%
3.7.1.196921.81%
3.6.3.164014.40%
3.7.0.545610.26%
3.7.0.72986.71%
3.7.0.32776.23%
Other541.22%

Trend Micro (4,148 servers)

Version Number of Servers Percent
5.71,83144.14%
5.51,75242.24%
5.1845010.85%
7.0481.16%
Other671.62%

GroupWise (3,437 servers)

Version Number of Servers Percent
7.0.284824.67%
7.0.161817.98%
6.5.741211.99%
6.5.43008.73%
6.5.62156.26%
6.0.42035.91%
7.01574.57%
6.5.51474.28%
6.5.11263.67%
6.5.3611.77%
6.0.2581.69%
6.5.2571.66%
6.0.3561.63%
5.5.5491.43%
6.5.0351.02%
Other952.76%

ArGoSoft (2,899 servers)

Version Number of Servers Percent
1.8 (1.8.9.1)78327.01%
1.8 (1.8.8.8)47316.32%
1.8 (1.8.8.7)34611.94%
1.8 (1.8.8.9)1836.31%
1.8 (1.8.9.2)1133.90%
1.8 (1.8.9.0)1073.69%
1.8 (1.8.8.1)732.52%
1.8 (1.8.6.0)652.24%
1.8 (1.8.8.2)632.17%
1.8 (1.8.8.3)531.83%
1.8 (1.8.5.9)421.45%
1.8 (1.8.7.5)411.41%
1.8 (1.8.8.4)381.31%
1.8 (1.8.8.9 341.17%
1.8 (1.8.8.5)321.10%
Other45315.63%

XMail (2,536 servers)

Version Number of Servers Percent
1.2286934.27%
1.2449119.36%
1.2138415.14%
1.201787.02%
1.171686.62%
1.231365.36%
1.12873.43%
1.18501.97%
1.16421.66%
Other1315.17%

SurgeSMTP (1,832 servers)

Version Number of Servers Percent
3.8i3-334518.83%
3.8k4-422312.17%
3.7b8-820611.24%
3.8f3-31588.62%
3.8o-11317.15%
3.8k2-21156.28%
3.6f5-5995.40%
3.8f2-2874.75%
3.5b3-3653.55%
3.0c2-2542.95%
3.8i-1452.46%
3.8m-1442.40%
3.7b6-6412.24%
3.8k-1241.31%
2.0g2-1201.09%
Other1759.55%

Qmail Toaster (1,488 servers)

Version Number of Servers Percent
1.397865.73%
1.241928.16%
1.0916.12%
Other00.00%

Gordano Messaging Suite (GMS) (1,295 servers)

Version Number of Servers Percent
Other1,295100.00%

Post.Office (1,080 servers)

Version Number of Servers Percent
3.5.330428.15%
4.0.1948.70%
3.5.3J918.43%
3.8.3676.20%
3.6.3595.46%
3.6.2423.89%
3.9.1393.61%
3.1.2J373.43%
3.1.2292.69%
3.9.2282.59%
3.9.2.3282.59%
3.8.4262.41%
3.9.0262.41%
3.8.7.4222.04%
3.5.2211.94%
4.0.0.2201.85%
3.6.0181.67%
3.9.1.3131.20%
3.8.2131.20%
4.0.0.1121.11%
3.9.2.1121.11%
Other797.31%

NetIQ MailMarshal (939 servers)

Version Number of Servers Percent
6.0.3.871075.61%
5.5.6.7565.96%
6.1.3.15485.11%
5.5.4.16222.34%
5.5.6.5212.24%
5.5.6.6212.24%
5.5.5.9151.60%
5.5.5.6131.38%
Other333.51%

InterScan VirusWall (920 servers)

Version Number of Servers Percent
Other920100.00%

Interscan (780 servers)

Version Number of Servers Percent
3.55 (build 1016)16220.77%
3.81-Build_10229211.79%
3.8-Build_30138210.51%
3.53 (build 2011)678.59%
3.53 (build 2017)627.95%
3.55 (build 1029)577.31%
3.81-Build_1084465.90%
3.53 (build 2013)374.74%
3.55 (build 1020)283.59%
3.53 (build 1493)253.21%
3.52 (build 1375)243.08%
3.8-Build_1080111.41%
3.8-Build_3065111.41%
3.81-Build_105581.03%
Other688.72%

VisNetic (581 servers)

Version Number of Servers Percent
8.5.0.812221.00%
7.2.4.1457.75%
5.8.6.6376.37%
8.3.5.0345.85%
6.2.2.0325.51%
8.0.3.1315.34%
8.0.3.0305.16%
7.6.1.0305.16%
5.0.2.3305.16%
5.5.8.3264.48%
5.3.5.0193.27%
8.0.3172.93%
8.3.6172.93%
5.4.5.4142.41%
8.5.0.5142.41%
7.5.3.0101.72%
8.9.2.0101.72%
5.0.181.38%
5.8.6.471.20%
8.3.0.161.03%
Other427.23%

Mirapoint (554 servers)

Version Number of Servers Percent
3.8.3-GA11019.86%
3.8.4-GA10719.31%
3.7.5a-GA7112.82%
3.8.5-GA559.93%
3.8.2-GA559.93%
3.7.3a-GA376.68%
3.7.4b-GA315.60%
3.7.5-GA173.07%
1.1.091.62%
3.5.8-GR91.62%
3.7.1-GA81.44%
3.7.2-GA81.44%
3.7.3-GA61.08%
Other315.60%

ModusMail (439 servers)

Version Number of Servers Percent
4.35.480.025157.18%
3.2.315.0327.29%
4.1.361.21296.61%
4.2.425.22235.24%
4.35.477.0225.01%
3.1.297.0163.64%
3.0.273.0122.73%
3.1.302.0112.51%
4.35.480.11102.28%
4.3.459.061.37%
Other276.15%

MagicMail (303 servers)

Version Number of Servers Percent
Other303100.00%

WebSTAR V (252 servers)

Version Number of Servers Percent
5.4.07630.16%
5.4.16726.59%
5.3.45722.62%
5.3.3228.73%
5.3.2197.54%
5.3.083.17%
Other31.19%

Mercury (237 servers)

Version Number of Servers Percent
1.4810945.99%
3.327832.91%
3.21c208.44%
1.4493.80%
3.3183.38%
1.4752.11%
Other83.38%

Neon Mail Server (183 servers)

Version Number of Servers Percent
3.0.96736.61%
3.0.75429.51%
3.1.04524.59%
3.0.684.37%
3.0.852.73%
3.0.421.09%
3.0.521.09%
Other00.00%

MAILsweeper (152 servers)

Version Number of Servers Percent
4.3.20.03120.39%
4.3.14.02516.45%
4.3.17.02415.79%
4.3.12.01711.18%
4.3.19.01711.18%
4.2.10.095.92%
4.3.6.074.61%
4.3.10.074.61%
4.2.5.053.29%
4.3.1.053.29%
4.2.1.031.97%
Other21.32%

MessageWall (115 servers)

Version Number of Servers Percent
1.0.89280.00%
1.0.111714.78%
1.0.632.61%
1.1.032.61%
Other00.00%

WebSTAR (111 servers)

Version Number of Servers Percent
Other111100.00%

OpenVMS (36 servers)

Version Number of Servers Percent
7.31438.89%
8.21027.78%
8.3822.22%
7.238.33%
6.112.78%
Other00.00%




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