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Mail (MX) Server Survey
April 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 Queried1,701,203   100.0%
Number of Servers that didn't respond244,65514.38%
    Server didn't open socket235,83813.86%
    Server didn't provide banner8,8170.52%
Server provided banner1,456,54885.62%
Server banner identifies software in use904,40753.16%

As indicated by the above table, of the 1,701,203 servers queried, only 904,407 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
Sendmail281,49731.13%
Microsoft193,31921.38%
Exim170,54318.86%
Postfix125,31113.86%
IMail34,3393.80%
MDaemon21,7662.41%
MailEnable19,8662.20%
Merak8,6450.96%
Lotus Domino8,0960.90%
CommuniGate Pro5,1800.57%
Trend Micro4,8420.54%
WinWebMail4,3680.48%
Kerio4,3240.48%
GroupWise4,0540.45%
ArGoSoft3,0990.34%
XMail2,5010.28%
SurgeSMTP1,7480.19%
Gordano Messaging Suite (GMS)1,5210.17%
Qmail Toaster1,2780.14%
NetIQ MailMarshal1,2710.14%
Post.Office1,2210.14%
InterScan VirusWall1,1990.13%
Interscan1,0410.12%
VisNetic6490.07%
ModusMail5980.07%
Mirapoint5460.06%
WebSTAR V3070.03%
Mercury3070.03%
MagicMail2650.03%
MAILsweeper2490.03%
Neon Mail Server1670.02%
WebSTAR1430.02%
MessageWall1140.01%
OpenVMS330.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (281,497 servers)

Version Number of Servers Percent
8.12.11.2006061448,59617.26%
8.12.11.2006030835,67312.67%
8.11.631,88811.33%
8.13.628,32410.06%
8.13.122,1287.86%
8.12.1021,4447.62%
8.13.813,8644.93%
8.12.1112,9364.60%
8.13.410,5583.75%
8.13.6.200606149,7083.45%
8.12.89,5703.40%
8.10.26,2032.20%
8.13.76,1652.19%
8.9.36,1462.18%
8.13.32,9391.04%
Other15,3555.45%

Microsoft (193,319 servers)

Version Number of Servers Percent
6.0.3790.1830134,92669.79%
5.0.2195.671332,71816.92%
6.0.3790.21116,5458.56%
6.0.3790.02,3771.23%
5.5.2653.132,3011.19%
Other4,4522.30%

Exim (170,543 servers)

Version Number of Servers Percent
4.63114,93767.39%
4.5215,2328.93%
4.5010,6396.24%
4.607,5214.41%
4.623,9492.32%
4.663,3021.94%
4.442,8781.69%
3.361,8101.06%
Other10,2756.02%

Postfix (125,311 servers)

Version Number of Servers Percent
Other125,311100.00%

IMail (34,339 servers)

Version Number of Servers Percent
8.156,93220.19%
8.225,94717.32%
9.104,48513.06%
8.054,48313.06%
7.071,5034.38%
7.151,4124.11%
6.061,3083.81%
8.211,2913.76%
9.046922.02%
8.006441.88%
8.205861.71%
8.024151.21%
8.103981.16%
8.123861.12%
8.133671.07%
8.013511.02%
Other3,1399.14%

MDaemon (21,766 servers)

Version Number of Servers Percent
9.5.52,49611.47%
9.5.61,6947.78%
8.1.31,5627.18%
9.5.41,5257.01%
9.0.41,2755.86%
6.8.59714.46%
9.5.37923.64%
7.2.37913.63%
7.2.07153.28%
9.0.16733.09%
9.5.16272.88%
8.1.46172.83%
9.5.25552.55%
9.0.05462.51%
8.0.25382.47%
9.0.65292.43%
8.0.34382.01%
8.1.14341.99%
9.0.74171.92%
7.1.23851.77%
8.1.53811.75%
7.1.03221.48%
7.2.23201.47%
6.8.42831.30%
7.0.12821.30%
7.2.12811.29%
8.0.12771.27%
9.0.52751.26%
Other1,7658.11%

MailEnable (19,866 servers)

Version Number of Servers Percent
1.981--2,87314.46%
1.8--1,9099.61%
1.96--1,9059.59%
1.9--1,8739.43%
1.95--1,6648.38%
0-2.37-1,0065.06%
0-2.36-9844.95%
0-1.85-9144.60%
0--2.375352.69%
0-1.841-4792.41%
0-1.6-4142.08%
0--2.364052.04%
0-1.75-3311.67%
0-1.54-3121.57%
0-2.32-2691.35%
1.73--2541.28%
0-1.79-2031.02%
Other3,53617.80%

Merak (8,645 servers)

Version Number of Servers Percent
8.0.31,93022.33%
8.9.11,77620.54%
8.5.01,00811.66%
8.3.84455.15%
7.4.54034.66%
7.5.23273.78%
7.6.43123.61%
8.9.02452.83%
7.4.21952.26%
8.2.41782.06%
7.2.01732.00%
6.2.11261.46%
8.3.01101.27%
7.4.01021.18%
7.6.1941.09%
Other1,22114.12%

Lotus Domino (8,096 servers)

Version Number of Servers Percent
7.0.28099.99%
6.5.47349.07%
7.0.16878.49%
6.5.16548.08%
6.5.35346.60%
6.5.54775.89%
7.04195.18%
6.53654.51%
5.0.112913.59%
6.5.22763.41%
7.0.2FP12332.88%
5.0.122152.66%
7.0.1FP11812.24%
6.5.5FP21682.08%
5.0.81662.05%
5.0.101461.80%
5.0.13a1371.69%
6.5.4FP21281.58%
6.0.2CF11241.53%
6.5.4FP31141.41%
6.0.31101.36%
6.01081.33%
6.5.4FP1971.20%
6.5.5FP1961.19%
5.0.9901.11%
Other7379.10%

CommuniGate Pro (5,180 servers)

Version Number of Servers Percent
4.1.871913.88%
4.2.105179.98%
5.0.93316.39%
5.1.71943.75%
5.1.51793.46%
5.1.31522.93%
5.0.81472.84%
4.2.81332.57%
5.1.61252.41%
4.21242.39%
4.2.71202.32%
5.0.111202.32%
5.0.131172.26%
4.2.91152.22%
4.0.61132.18%
4.3.81102.12%
5.1.41072.07%
4.3.61021.97%
4.0.1961.85%
5.1.2951.83%
4.3.12881.70%
3.5.9821.58%
5.0.10751.45%
5.1.1691.33%
5.0.6651.25%
4.2.4561.08%
4.2.6531.02%
Other97618.84%

Trend Micro (4,842 servers)

Version Number of Servers Percent
5.52,44850.56%
5.71,83837.96%
5.1848910.10%
Other671.38%

WinWebMail (4,368 servers)

Version Number of Servers Percent
3.7.1.11,20927.68%
3.7.3.188720.31%
3.6.3.186519.80%
3.7.0.555112.61%
3.7.0.743810.03%
3.7.0.33698.45%
Other491.12%

Kerio (4,324 servers)

Version Number of Servers Percent
6.3.11,41632.75%
6.3.062114.36%
6.2.22916.73%
6.1.32054.74%
6.1.22014.65%
6.2.01864.30%
6.1.01774.09%
6.1.41734.00%
6.0.101433.31%
6.1.1982.27%
6.0.3912.10%
6.2.1761.76%
6.0.8671.55%
5.7.10601.39%
6.0.9591.36%
6.0.6451.04%
Other4159.60%

GroupWise (4,054 servers)

Version Number of Servers Percent
7.0.11,29331.89%
6.5.449312.16%
6.5.73328.19%
6.0.43007.40%
7.02806.91%
6.5.62636.49%
6.5.52305.67%
6.5.11914.71%
6.5.31042.57%
6.5.21002.47%
6.0.2912.24%
6.0.3842.07%
5.5.5731.80%
6.5.0551.36%
6.0.1531.31%
Other1122.76%

ArGoSoft (3,099 servers)

Version Number of Servers Percent
1.8 (1.8.8.8)99031.95%
1.8 (1.8.8.7)54817.68%
1.8 (1.8.8.9)32210.39%
1.8 (1.8.8.1)1053.39%
1.8 (1.8.6.0)912.94%
1.8 (1.8.8.3)732.36%
1.8 (1.8.8.5)692.23%
1.8 (1.8.8.2)692.23%
1.8 (1.8.8.9 642.07%
1.8 (1.8.8.4)541.74%
1.8 (1.8.5.9)481.55%
1.8 (1.8.7.5)471.52%
1.8 (1.8.6.6)391.26%
1.8 (1.8.8.6)361.16%
Other54417.55%

XMail (2,501 servers)

Version Number of Servers Percent
1.2296138.42%
1.2146218.47%
1.202198.76%
1.242128.48%
1.171907.60%
1.231335.32%
1.12763.04%
1.18652.60%
1.16421.68%
1.10351.40%
1.15271.08%
Other793.16%

SurgeSMTP (1,748 servers)

Version Number of Servers Percent
3.8f3-338121.80%
3.8f2-237121.22%
3.7b8-827515.73%
3.6f5-51397.95%
3.5b3-3844.81%
3.0c2-2784.46%
3.7b6-6502.86%
3.8g-7482.75%
3.8g-21452.57%
2.1c7-7281.60%
2.0g2-1241.37%
1.8g3201.14%
Other20511.73%

Gordano Messaging Suite (GMS) (1,521 servers)

Version Number of Servers Percent
Other1,521100.00%

Qmail Toaster (1,278 servers)

Version Number of Servers Percent
1.363749.84%
1.251740.45%
1.01239.62%
Other10.08%

NetIQ MailMarshal (1,271 servers)

Version Number of Servers Percent
6.0.3.892973.09%
5.5.6.7917.16%
6.1.3.15624.88%
5.5.5.9362.83%
5.5.4.16322.52%
5.5.6.6302.36%
5.5.6.5241.89%
5.5.4.17141.10%
5.5.5.6131.02%
Other403.15%

Post.Office (1,221 servers)

Version Number of Servers Percent
3.5.339832.60%
3.5.3J1098.93%
3.8.3746.06%
3.6.3715.81%
4.0.1564.59%
3.6.2514.18%
3.1.2J443.60%
3.9.1393.19%
3.1.2352.87%
3.9.2302.46%
3.8.4282.29%
3.9.0262.13%
3.5.2262.13%
3.6.0252.05%
3.8.7.4221.80%
4.0.0.2221.80%
4.0.0.1171.39%
3.9.2.3161.31%
3.9.1.3141.15%
Other1189.66%

InterScan VirusWall (1,199 servers)

Version Number of Servers Percent
Other1,199100.00%

Interscan (1,041 servers)

Version Number of Servers Percent
3.55 (build 1016)23722.77%
3.81-Build_102212912.39%
3.8-Build_301310910.47%
3.53 (build 2011)918.74%
3.55 (build 1029)888.45%
3.53 (build 2017)848.07%
3.53 (build 2013)484.61%
3.55 (build 1020)373.55%
3.53 (build 1493)343.27%
3.52 (build 1375)262.50%
3.8-Build_1080222.11%
3.8-Build_3065151.44%
3.81-Build_1084151.44%
Other10610.18%

VisNetic (649 servers)

Version Number of Servers Percent
8.5.0.811617.87%
7.2.4.1517.86%
5.8.6.6467.09%
8.0.3.0456.93%
5.0.2.3396.01%
8.3.5.0385.86%
6.2.2.0375.70%
8.0.3.1335.08%
5.5.8.3324.93%
7.6.1.0314.78%
8.3.6264.01%
8.5.0.5213.24%
5.3.5.0162.47%
8.0.3162.47%
7.5.3.0142.16%
5.4.5.4142.16%
8.3.0.1121.85%
5.8.6.491.39%
7.2.4.091.39%
5.0.171.08%
Other375.70%

ModusMail (598 servers)

Version Number of Servers Percent
4.35.480.035859.87%
3.2.315.0376.19%
4.1.361.21305.02%
4.2.425.22274.52%
3.1.302.0254.18%
3.1.297.0193.18%
4.35.477.0183.01%
4.3.459.0152.51%
4.35.480.11132.17%
4.1.361.091.51%
4.2.425.481.34%
4.2.425.1661.00%
Other335.52%

Mirapoint (546 servers)

Version Number of Servers Percent
3.8.3-GA10819.78%
3.7.5a-GA9918.13%
3.8.2-GA8014.65%
3.7.3a-GA488.79%
3.7.4b-GA417.51%
3.7.5-GA295.31%
3.7.2-GA183.30%
3.7.1-GA173.11%
3.5.8-GR152.75%
1.1.0101.83%
3.7.0-GA101.83%
3.6.6-GR81.47%
3.8.0-FCS81.47%
3.7.3-GA71.28%
3.6.4-CR61.10%
Other427.69%

WebSTAR V (307 servers)

Version Number of Servers Percent
5.4.09430.62%
5.4.18628.01%
5.3.46521.17%
5.3.3278.79%
5.3.2206.51%
5.3.0103.26%
Other51.63%

Mercury (307 servers)

Version Number of Servers Percent
1.4812942.02%
3.3211136.16%
3.21c268.47%
3.31165.21%
1.44123.91%
1.4761.95%
Other72.28%

MagicMail (265 servers)

Version Number of Servers Percent
Other265100.00%

MAILsweeper (249 servers)

Version Number of Servers Percent
4.3.12.04417.67%
4.3.20.03915.66%
4.3.17.03815.26%
4.3.19.03514.06%
4.3.14.03313.25%
4.2.10.0156.02%
4.2.1.0114.42%
4.3.10.0114.42%
4.3.1.083.21%
4.3.6.072.81%
4.2.5.052.01%
Other31.20%

Neon Mail Server (167 servers)

Version Number of Servers Percent
3.0.97645.51%
3.0.76438.32%
3.0.8105.99%
3.0.674.19%
3.1.074.19%
3.0.421.20%
Other10.60%

WebSTAR (143 servers)

Version Number of Servers Percent
Other143100.00%

MessageWall (114 servers)

Version Number of Servers Percent
1.0.88171.05%
1.0.111614.04%
1.1.2376.14%
1.0.632.63%
1.1.032.63%
1.0.1021.75%
Other21.75%

OpenVMS (33 servers)

Version Number of Servers Percent
7.31236.36%
8.21030.30%
7.2515.15%
8.3515.15%
6.113.03%
Other00.00%




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