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Mail (MX) Server Survey
July 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 Queried1,736,063   100.0%
Number of Servers that didn't respond256,88914.80%
    Server didn't open socket247,89114.28%
    Server didn't provide banner8,9980.52%
Server provided banner1,479,17485.20%
Server banner identifies software in use908,98752.36%

As indicated by the above table, of the 1,736,063 servers queried, only 908,987 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
Sendmail271,40029.86%
Microsoft197,61821.74%
Exim178,82719.67%
Postfix130,65614.37%
IMail31,6813.49%
MDaemon21,8782.41%
MailEnable20,5512.26%
Merak8,6510.95%
Lotus Domino7,7440.85%
CommuniGate Pro5,1400.57%
Kerio4,6660.51%
Trend Micro4,6410.51%
WinWebMail4,3600.48%
GroupWise3,7410.41%
ArGoSoft3,0000.33%
XMail2,4990.27%
SurgeSMTP1,7310.19%
Gordano Messaging Suite (GMS)1,3940.15%
Qmail Toaster1,3810.15%
Post.Office1,1450.13%
NetIQ MailMarshal1,0830.12%
InterScan VirusWall1,0820.12%
Interscan9000.10%
VisNetic6230.07%
Mirapoint5660.06%
ModusMail5090.06%
MagicMail2930.03%
Mercury2910.03%
WebSTAR V2820.03%
MAILsweeper2010.02%
Neon Mail Server1810.02%
MessageWall1220.01%
WebSTAR1170.01%
OpenVMS330.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (271,400 servers)

Version Number of Servers Percent
8.12.11.2006061445,78116.87%
8.12.11.2006030833,50812.35%
8.11.628,26710.42%
8.13.627,16410.01%
8.13.125,5689.42%
8.12.1019,5177.19%
8.13.815,7955.82%
8.12.1112,0284.43%
8.13.6.2006061410,2223.77%
8.13.49,5723.53%
8.12.88,5443.15%
8.13.76,1032.25%
8.10.25,5152.03%
8.9.35,2241.92%
Other18,5926.85%

Microsoft (197,618 servers)

Version Number of Servers Percent
6.0.3790.1830105,23153.25%
6.0.3790.395942,08021.29%
5.0.2195.671328,91314.63%
6.0.3790.21113,7386.95%
6.0.3790.02,0121.02%
Other5,6442.86%

Exim (178,827 servers)

Version Number of Servers Percent
4.6389,24849.91%
4.6643,22224.17%
4.529,2195.16%
4.509,1525.12%
4.607,7524.33%
4.623,9672.22%
4.672,7091.51%
4.442,6491.48%
Other10,9096.10%

Postfix (130,656 servers)

Version Number of Servers Percent
Other130,656100.00%

IMail (31,681 servers)

Version Number of Servers Percent
8.156,11519.30%
8.226,06819.15%
8.053,82112.06%
9.102,9859.42%
9.202,4707.80%
7.151,3394.23%
7.071,2613.98%
6.061,0293.25%
8.218142.57%
8.006001.89%
8.204911.55%
9.044791.51%
8.103851.22%
8.023651.15%
8.123341.05%
8.043231.02%
8.133231.02%
Other2,4797.82%

MDaemon (21,878 servers)

Version Number of Servers Percent
9.5.66,09327.85%
8.1.31,3856.33%
9.0.41,2225.59%
6.8.58593.93%
9.5.47413.39%
7.2.37363.36%
9.5.56963.18%
9.5.26663.04%
9.5.16593.01%
7.2.06522.98%
9.0.15872.68%
8.1.45332.44%
9.5.34982.28%
9.0.04822.20%
8.0.24792.19%
8.0.34061.86%
8.1.14021.84%
9.0.73501.60%
9.0.63411.56%
7.1.23381.54%
8.1.53261.49%
7.1.03041.39%
7.2.22941.34%
7.2.12621.20%
8.0.12441.12%
7.0.12351.07%
6.8.42341.07%
Other1,8548.47%

MailEnable (20,551 servers)

Version Number of Servers Percent
1.981--4,06019.76%
1.96--2,14010.41%
0-2.37-1,7698.61%
1.95--1,6828.18%
1.9--1,6808.17%
1.8--1,6658.10%
0-1.85-1,1175.44%
0--2.379664.70%
0-2.36-7473.63%
0-1.841-3551.73%
0--2.362701.31%
0-1.75-2391.16%
0-1.54-2381.16%
1.73--2281.11%
Other3,39516.52%

Merak (8,651 servers)

Version Number of Servers Percent
8.9.12,21325.58%
8.0.32,00023.12%
8.5.07889.11%
8.3.83924.53%
7.4.53814.40%
7.5.23243.75%
7.6.42983.44%
7.4.21942.24%
8.9.01822.10%
7.2.01551.79%
8.2.41441.66%
6.2.11051.21%
8.3.01041.20%
7.4.0951.10%
Other1,27614.75%

Lotus Domino (7,744 servers)

Version Number of Servers Percent
7.0.293812.11%
7.0.16238.04%
6.5.46208.01%
6.5.15757.43%
7.0.2FP14926.35%
6.5.34545.86%
6.5.54155.36%
7.03744.83%
6.53214.15%
5.0.112553.29%
6.5.22503.23%
5.0.121822.35%
6.5.5FP21612.08%
7.0.1FP11582.04%
5.0.81471.90%
5.0.101371.77%
5.0.13a1281.65%
6.5.4FP21131.46%
6.5.4FP31061.37%
6.0.2CF11011.30%
6.0941.21%
6.0.3901.16%
6.5.5FP1821.06%
Other92811.98%

CommuniGate Pro (5,140 servers)

Version Number of Servers Percent
4.1.866412.92%
4.2.104949.61%
5.1.93476.75%
5.0.92595.04%
5.1.72404.67%
5.1.82114.11%
5.0.131783.46%
4.2.81252.43%
5.0.81162.26%
4.2.71162.26%
4.21142.22%
4.3.121122.18%
5.0.111112.16%
5.1.31082.10%
5.1.51062.06%
4.2.91021.98%
4.0.1931.81%
5.1.6891.73%
4.0.6861.67%
4.3.8741.44%
5.1.4731.42%
3.5.9681.32%
5.1.2651.26%
5.0.6571.11%
5.0.10561.09%
5.1.1551.07%
Other1,02119.86%

Kerio (4,666 servers)

Version Number of Servers Percent
6.3.11,59434.16%
6.4.077016.50%
6.3.04329.26%
6.2.21984.24%
6.1.31663.56%
6.2.01603.43%
6.1.21543.30%
6.1.01503.21%
6.0.101332.85%
6.1.41212.59%
6.0.3871.86%
6.1.1751.61%
6.2.1611.31%
6.0.8571.22%
5.7.10501.07%
6.0.9471.01%
Other4118.81%

Trend Micro (4,641 servers)

Version Number of Servers Percent
5.52,15146.35%
5.71,93241.63%
5.1847710.28%
Other811.75%

WinWebMail (4,360 servers)

Version Number of Servers Percent
3.7.3.11,37631.56%
3.7.1.11,03223.67%
3.6.3.173716.90%
3.7.0.548311.08%
3.7.0.73738.56%
3.7.0.33107.11%
Other491.12%

GroupWise (3,741 servers)

Version Number of Servers Percent
7.0.194725.31%
7.0.246012.30%
6.5.744011.76%
6.5.43689.84%
6.0.42426.47%
6.5.62376.34%
7.01965.24%
6.5.51784.76%
6.5.11604.28%
6.5.3812.17%
6.0.2762.03%
6.5.2711.90%
6.0.3661.76%
5.5.5541.44%
6.5.0451.20%
6.0.1441.18%
Other762.03%

ArGoSoft (3,000 servers)

Version Number of Servers Percent
1.8 (1.8.8.8)61920.63%
1.8 (1.8.9.1)52917.63%
1.8 (1.8.8.7)43614.53%
1.8 (1.8.8.9)2598.63%
1.8 (1.8.9.0)1464.87%
1.8 (1.8.8.1)852.83%
1.8 (1.8.6.0)772.57%
1.8 (1.8.8.2)642.13%
1.8 (1.8.8.3)561.87%
1.8 (1.8.8.5)501.67%
1.8 (1.8.5.9)461.53%
1.8 (1.8.7.5)421.40%
1.8 (1.8.8.9 401.33%
1.8 (1.8.8.4)391.30%
1.8 (1.8.6.6)321.07%
Other48016.00%

XMail (2,499 servers)

Version Number of Servers Percent
1.2291036.41%
1.2141616.65%
1.2436414.57%
1.201997.96%
1.171686.72%
1.231425.68%
1.12803.20%
1.18522.08%
1.16371.48%
1.15261.04%
1.10251.00%
Other803.20%

SurgeSMTP (1,731 servers)

Version Number of Servers Percent
3.8i3-351329.64%
3.8f3-320611.90%
3.7b8-819311.15%
3.8f2-21357.80%
3.8i-11287.39%
3.6f5-51126.47%
3.5b3-3714.10%
3.0c2-2533.06%
3.7b6-6472.72%
2.0g2-1261.50%
3.8g-21241.39%
2.1c7-7221.27%
1.8g3181.04%
Other18310.57%

Gordano Messaging Suite (GMS) (1,394 servers)

Version Number of Servers Percent
Other1,394100.00%

Qmail Toaster (1,381 servers)

Version Number of Servers Percent
1.381358.87%
1.246533.67%
1.01037.46%
Other00.00%

Post.Office (1,145 servers)

Version Number of Servers Percent
3.5.334730.31%
3.5.3J998.65%
4.0.1806.99%
3.8.3716.20%
3.6.3635.50%
3.6.2453.93%
3.1.2J433.76%
3.9.1393.41%
3.1.2322.79%
3.9.2.3302.62%
3.9.2292.53%
3.9.0272.36%
4.0.0.2232.01%
3.8.7.4232.01%
3.8.4232.01%
3.5.2211.83%
3.6.0161.40%
4.0.0.1141.22%
3.9.1.3121.05%
3.9.2.1121.05%
Other968.38%

NetIQ MailMarshal (1,083 servers)

Version Number of Servers Percent
6.0.3.881575.25%
5.5.6.7666.09%
6.1.3.15555.08%
5.5.6.6272.49%
5.5.5.9252.31%
5.5.4.16211.94%
5.5.6.5201.85%
5.5.5.6131.20%
Other413.79%

InterScan VirusWall (1,082 servers)

Version Number of Servers Percent
Other1,082100.00%

Interscan (900 servers)

Version Number of Servers Percent
3.55 (build 1016)19721.89%
3.81-Build_102211913.22%
3.8-Build_30139810.89%
3.53 (build 2011)808.89%
3.55 (build 1029)768.44%
3.53 (build 2017)667.33%
3.53 (build 2013)434.78%
3.55 (build 1020)323.56%
3.53 (build 1493)293.22%
3.52 (build 1375)283.11%
3.8-Build_1080171.89%
3.81-Build_1084121.33%
3.8-Build_3065111.22%
Other9210.22%

VisNetic (623 servers)

Version Number of Servers Percent
8.5.0.811618.62%
7.2.4.1508.03%
5.8.6.6426.74%
8.0.3.0416.58%
8.3.5.0375.94%
5.0.2.3375.94%
6.2.2.0355.62%
8.0.3.1345.46%
7.6.1.0304.82%
5.5.8.3294.65%
8.3.6203.21%
5.3.5.0172.73%
8.0.3162.57%
5.4.5.4152.41%
8.5.0.5152.41%
7.5.3.0101.61%
8.3.0.191.44%
7.2.4.091.44%
5.8.6.481.28%
8.9.2.071.12%
Other467.38%

Mirapoint (566 servers)

Version Number of Servers Percent
3.8.3-GA12822.61%
3.7.5a-GA9817.31%
3.8.2-GA7312.90%
3.8.4-GA6611.66%
3.7.3a-GA417.24%
3.7.4b-GA325.65%
3.7.5-GA213.71%
3.7.1-GA132.30%
3.5.8-GR132.30%
1.1.0111.94%
3.7.2-GA111.94%
3.7.0-GA81.41%
3.6.6-GR81.41%
3.7.3-GA61.06%
Other376.54%

ModusMail (509 servers)

Version Number of Servers Percent
4.35.480.030960.71%
3.2.315.0336.48%
4.1.361.21265.11%
4.2.425.22254.91%
4.35.477.0214.13%
3.1.297.0173.34%
4.35.480.11122.36%
3.1.302.0101.96%
4.3.459.091.77%
4.2.425.471.38%
3.0.273.071.38%
Other336.48%

MagicMail (293 servers)

Version Number of Servers Percent
Other293100.00%

Mercury (291 servers)

Version Number of Servers Percent
1.4812944.33%
3.3210335.40%
3.21c217.22%
3.31144.81%
1.44124.12%
1.4762.06%
Other62.06%

WebSTAR V (282 servers)

Version Number of Servers Percent
5.4.08429.79%
5.4.17426.24%
5.3.46221.99%
5.3.3269.22%
5.3.2227.80%
5.3.0103.55%
5.2.431.06%
Other10.35%

MAILsweeper (201 servers)

Version Number of Servers Percent
4.3.20.03818.91%
4.3.12.03416.92%
4.3.17.02813.93%
4.3.19.02813.93%
4.3.14.02411.94%
4.2.10.0125.97%
4.2.1.083.98%
4.3.1.073.48%
4.3.6.073.48%
4.3.10.073.48%
4.2.5.052.49%
Other31.49%

Neon Mail Server (181 servers)

Version Number of Servers Percent
3.0.97541.44%
3.0.75731.49%
3.1.02916.02%
3.0.894.97%
3.0.673.87%
3.0.421.10%
3.0.521.10%
Other00.00%

MessageWall (122 servers)

Version Number of Servers Percent
1.0.89275.41%
1.0.111713.93%
1.1.2375.74%
1.0.632.46%
1.1.021.64%
Other10.82%

WebSTAR (117 servers)

Version Number of Servers Percent
Other117100.00%

OpenVMS (33 servers)

Version Number of Servers Percent
7.31236.36%
8.21030.30%
8.3618.18%
7.2412.12%
6.113.03%
Other00.00%




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