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Mail (MX) Server Survey
May 1st, 2011

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 Queried2,258,621   100.0%
Number of Servers that didn't respond385,04017.05%
    Server didn't open socket372,14316.48%
    Server didn't provide banner12,8970.57%
Server provided banner1,873,58182.95%
Server banner identifies software in use1,018,49945.09%

As indicated by the above table, of the 2,258,621 servers queried, only 1,018,499 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
Exim403,04339.57%
Postfix230,12922.59%
Microsoft149,52814.68%
Sendmail140,86713.83%
MailEnable32,6093.20%
MDaemon22,1312.17%
IMail10,9391.07%
Lotus Domino5,1150.50%
WinWebMail4,5220.44%
CommuniGate Pro3,6320.36%
Kerio2,8760.28%
XMail2,4960.25%
Merak2,0630.20%
Qmail Toaster1,7450.17%
SurgeSMTP1,2900.13%
ArGoSoft1,2020.12%
GroupWise1,0430.10%
Trend Micro6510.06%
Post.Office4960.05%
Gordano Messaging Suite (GMS)4870.05%
MagicMail3850.04%
Mirapoint2840.03%
VisNetic2430.02%
InterScan VirusWall2280.02%
NetIQ MailMarshal1100.01%
Interscan880.01%
Mercury800.01%
WebSTAR V590.01%
Neon Mail Server520.01%
OpenVMS240.00%
MessageWall230.00%
ModusMail220.00%
WebSTAR210.00%
MAILsweeper110.00%
OpenSMTPD50.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (403,043 servers)

Version Number of Servers Percent
4.69342,62685.01%
4.7219,3384.80%
4.6711,8532.94%
4.636,2091.54%
4.754,5641.13%
4.714,4051.09%
Other14,0483.49%

Postfix (230,129 servers)

Version Number of Servers Percent
Other230,129100.00%

Microsoft (149,528 servers)

Version Number of Servers Percent
6.0.3790.4675109,61873.31%
6.0.3790.395926,17617.51%
6.0.3790.18307,0174.69%
5.0.2195.73812,0911.40%
Other4,6263.09%

Sendmail (140,867 servers)

Version Number of Servers Percent
8.13.831,15022.11%
8.13.125,86518.36%
8.14.319,13113.58%
8.14.418,09212.84%
8.12.11.200603086,7434.79%
8.13.6.200606145,1653.67%
8.14.24,2042.98%
8.11.63,8262.72%
8.12.103,7762.68%
8.13.63,2492.31%
8.14.13,0572.17%
8.12.11.200606142,8051.99%
8.12.112,2461.59%
8.13.72,1801.55%
8.13.42,1221.51%
8.12.81,8361.30%
Other5,4203.85%

MailEnable (32,609 servers)

Version Number of Servers Percent
1.986--10,71132.85%
1.981--2,4417.49%
4.26--2,0346.24%
1.983--1,5504.75%
3.62--1,0193.12%
0-3.63-9192.82%
4.22--6251.92%
0-4.26-6111.87%
4.23--5651.73%
1.96--4491.38%
0-2.53-4371.34%
0-1.87-4251.30%
5.10--4221.29%
1.95--4171.28%
--3.633781.16%
4.14--3751.15%
Other9,23128.31%

MDaemon (22,131 servers)

Version Number of Servers Percent
11.0.34,29119.39%
12.0.12,62611.87%
10.1.21,2745.76%
11.0.01,1405.15%
10.0.01,1385.14%
10.1.19404.25%
12.0.08553.86%
9.6.17053.19%
9.6.66643.00%
10.1.05742.59%
9.5.24662.11%
9.6.54572.06%
10.0.54502.03%
10.0.23951.78%
9.6.23681.66%
9.5.13661.65%
9.5.63571.61%
9.6.43481.57%
10.0.43391.53%
11.0.23261.47%
8.1.33231.46%
9.0.42881.30%
11.0.12491.13%
Other3,19214.42%

IMail (10,939 servers)

Version Number of Servers Percent
8.222,13419.51%
11.028567.83%
8.158277.56%
11.038257.54%
9.237296.66%
11.015795.29%
8.055084.64%
9.204594.20%
9.104524.13%
10.023953.61%
11.03503.20%
7.073032.77%
9.212822.58%
7.152582.36%
6.062131.95%
8.002101.92%
11.51921.76%
10.011591.45%
8.041491.36%
Other1,0599.68%

Lotus Domino (5,115 servers)

Version Number of Servers Percent
8.5.260111.75%
8.5.14268.33%
8.5.2FP13767.35%
7.0.23025.90%
8.52965.79%
7.0.31733.38%
7.0.11583.09%
8.0.11553.03%
8.5.2FP21543.01%
8.0.21422.78%
6.5.41422.78%
8.5.1FP31342.62%
6.5.11202.35%
6.5.31132.21%
8.01102.15%
8.5.1FP21011.97%
7.0981.92%
8.5.1FP5961.88%
7.0.3FP1921.80%
7.0.2FP2881.72%
8.5.1FP4861.68%
6.5.5861.68%
6.5691.35%
8.5.1FP1611.19%
7.0.4551.08%
5.0.11521.02%
Other82916.21%

WinWebMail (4,522 servers)

Version Number of Servers Percent
3.8.0.194720.94%
3.7.6.167915.02%
3.8.1.364514.26%
3.7.7.348210.66%
3.7.3.147210.44%
3.8.1.14139.13%
3.7.1.12244.95%
3.7.5.11513.34%
3.7.7.11262.79%
3.6.3.11082.39%
3.7.0.5942.08%
3.7.0.3881.95%
3.7.0.7631.39%
Other300.66%

CommuniGate Pro (3,632 servers)

Version Number of Servers Percent
5.1.162546.99%
4.1.81955.37%
5.3.131464.02%
5.3.121403.85%
5.3.81253.44%
5.2.161193.28%
5.3.101153.17%
4.2.101103.03%
5.2.201093.00%
5.41093.00%
5.3.111052.89%
5.2.19892.45%
5.1.12822.26%
5.3.9812.23%
5.0.14752.06%
5.2.3732.01%
5.2.14711.95%
5.2.12691.90%
5.1.13591.62%
5.3.7551.51%
5.2.8551.51%
5.2.13511.40%
5.3.2481.32%
5.3.5461.27%
5.2.10431.18%
5.2.18431.18%
5.1.14421.16%
5.2.0401.10%
5.0.9371.02%
Other1,04628.80%

Kerio (2,876 servers)

Version Number of Servers Percent
6.7.338713.46%
6.6.232211.20%
6.7.02679.28%
6.7.22107.30%
6.5.01986.88%
6.5.21776.15%
6.7.11495.18%
6.3.11495.18%
6.4.11485.15%
6.4.01214.21%
6.6.0983.41%
6.5.1943.27%
6.6.1772.68%
6.4.2642.23%
6.3.0541.88%
6.2.2341.18%
6.1.3321.11%
6.2.0301.04%
Other2659.21%

XMail (2,496 servers)

Version Number of Servers Percent
1.2259423.80%
1.2554521.83%
1.2732813.14%
1.2632112.86%
1.2427811.14%
1.211104.41%
1.23712.84%
1.20612.44%
1.17471.88%
1.12371.48%
Other1044.17%

Merak (2,063 servers)

Version Number of Servers Percent
8.0.384440.91%
8.9.12009.69%
8.5.01396.74%
7.5.2944.56%
7.6.4894.31%
7.4.5884.27%
8.3.8813.93%
8.2.13462.23%
7.4.2321.55%
9.0.0281.36%
7.2.0261.26%
8.3.15251.21%
8.2.4251.21%
7.6.1241.16%
8.9.0241.16%
7.0.1231.11%
Other27513.33%

Qmail Toaster (1,745 servers)

Version Number of Servers Percent
1.31,62493.07%
1.2915.21%
1.0211.20%
Other90.52%

SurgeSMTP (1,290 servers)

Version Number of Servers Percent
5.2a-135727.67%
3.9e-11168.99%
4.2d4-4957.36%
5.0e4-4675.19%
3.8k4-4503.88%
4.0u4-4473.64%
4.2d2-2372.87%
5.1c2-2332.56%
5.0e3-3322.48%
4.3e-1282.17%
5.1c-1262.02%
3.8i3-3251.94%
4.3g4-4241.86%
4.3g2-2231.78%
5.3b2-2201.55%
3.7b8-8191.47%
3.6f5-5181.40%
4.2a3-3181.40%
3.9g2-2161.24%
3.9h-18151.16%
3.9c-1141.09%
3.8f3-3131.01%
Other19715.27%

ArGoSoft (1,202 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)24920.72%
1.8 (1.8.9.5)19316.06%
1.8 (1.8.9.3)15012.48%
1.8 (1.8.9.1)1119.23%
1.8 (1.8.8.8)998.24%
1.8 (1.8.8.7)705.82%
1.8 (1.8.9.2)564.66%
1.8 (1.8.9.4)352.91%
1.8 (1.8.8.1)211.75%
1.8 (1.8.8.9)191.58%
1.8 (1.8.9.0)161.33%
1.8 (1.8.6.0)151.25%
1.8 (1.8.8.2)131.08%
Other15512.90%

GroupWise (1,043 servers)

Version Number of Servers Percent
7.0.326125.02%
8.0.216816.11%
6.5.711310.83%
7.0.2959.11%
8.0.1737.00%
7.0.4504.79%
7.0.1504.79%
6.5.4464.41%
6.5.6343.26%
6.0.4282.68%
6.5.1272.59%
8.0.0272.59%
6.5.5171.63%
7.0111.05%
Other434.12%

Trend Micro (651 servers)

Version Number of Servers Percent
5.726741.01%
5.516825.81%
5.1811918.28%
7.0609.22%
7.1162.46%
781.23%
Other132.00%

Post.Office (496 servers)

Version Number of Servers Percent
3.5.37915.93%
4.1.0.25811.69%
4.0.1448.87%
4.1.2.4265.24%
3.5.3J255.04%
4.1.1234.64%
3.8.3214.23%
3.9.2.3153.02%
3.1.2J132.62%
3.9.2132.62%
3.9.1122.42%
3.8.7.4102.02%
4.1.0.4102.02%
4.0.1.1102.02%
4.1.0.3102.02%
3.1.2102.02%
4.191.81%
3.6.291.81%
3.9.2.181.61%
4.0.0.271.41%
3.9.1.371.41%
3.6.371.41%
4.1.2.261.21%
4.0.0.161.21%
4.1.2.361.21%
3.5.251.01%
3.9.051.01%
3.9.1.251.01%
Other377.46%

Gordano Messaging Suite (GMS) (487 servers)

Version Number of Servers Percent
Other487100.00%

MagicMail (385 servers)

Version Number of Servers Percent
Other385100.00%

Mirapoint (284 servers)

Version Number of Servers Percent
3.8.4-GA2910.21%
3.10.5-GA248.45%
3.10.8-GA217.39%
3.10.10a-GA207.04%
3.8.3-GA186.34%
4.1.10-GA155.28%
4.1.3-GA144.93%
3.10.9-GA144.93%
3.10.7-GA144.93%
4.1.9-GA134.58%
4.2.3-GA113.87%
4.1.8-GA103.52%
3.10.6-GA93.17%
3.10.4-GA93.17%
3.10.3-GA82.82%
3.8.7a72.46%
3.8.2-GA62.11%
4.1.4-GA62.11%
3.8.6-GA62.11%
3.8.5-GA62.11%
3.7.3a-GA41.41%
4.1.5-GA31.06%
3.7.5a-GA31.06%
Other144.93%

VisNetic (243 servers)

Version Number of Servers Percent
9.3.2.08334.16%
9.1.4.13514.40%
5.8.6.6177.00%
8.5.0.8135.35%
5.5.8.3104.12%
8.0.3.183.29%
7.6.1.072.88%
8.0.362.47%
6.2.2.062.47%
8.0.3.052.06%
5.0.2.352.06%
9.1.4.052.06%
8.3.5.052.06%
5.3.5.052.06%
5.0.2.141.65%
7.2.4.031.23%
8.3.631.23%
5.4.5.431.23%
7.2.4.131.23%
Other177.00%

InterScan VirusWall (228 servers)

Version Number of Servers Percent
Other228100.00%

NetIQ MailMarshal (110 servers)

Version Number of Servers Percent
6.0.3.87568.18%
6.1.3.15109.09%
5.5.6.787.27%
5.5.4.1654.55%
5.5.6.632.73%
5.5.3.1721.82%
5.5.6.521.82%
Other54.55%

Interscan (88 servers)

Version Number of Servers Percent
3.55 (build 1016)1618.18%
3.81-Build_10221112.50%
3.53 (build 2017)1011.36%
3.55 (build 1029)910.23%
3.8-Build_301377.95%
3.81-Build_108466.82%
3.55 (build 1020)55.68%
3.53 (build 1493)55.68%
3.52 (build 1375)44.55%
3.53 (build 2011)33.41%
3.53 (build 2013)22.27%
3.8-Build_108022.27%
3.53 (build 1494)11.14%
3.55 (build 2003)11.14%
3.51 (build 1321)11.14%
3.81-Build_105511.14%
3.6-Build_124611.14%
3.81-Build_103211.14%
3.8-Build_304511.14%
3.6-Build_120711.14%
Other00.00%

Mercury (80 servers)

Version Number of Servers Percent
1.484353.75%
3.322126.25%
3.21c56.25%
3.2122.50%
3.01a22.50%
1.4722.50%
3.3022.50%
1.4411.25%
3.3111.25%
1.4911.25%
Other00.00%

WebSTAR V (59 servers)

Version Number of Servers Percent
5.4.12237.29%
5.4.01322.03%
5.3.41220.34%
5.3.3610.17%
5.3.246.78%
5.3.011.69%
5.3.111.69%
Other00.00%

Neon Mail Server (52 servers)

Version Number of Servers Percent
3.1.31325.00%
3.0.71223.08%
3.1.2611.54%
3.0.9611.54%
3.1.459.62%
3.1.047.69%
3.0.623.85%
3.1.123.85%
3.1.523.85%
Other00.00%

OpenVMS (24 servers)

Version Number of Servers Percent
8.31145.83%
7.3729.17%
8.428.33%
8.228.33%
6.114.17%
7.214.17%
Other00.00%

MessageWall (23 servers)

Version Number of Servers Percent
1.0.82295.65%
1.0.614.35%
Other00.00%

ModusMail (22 servers)

Version Number of Servers Percent
4.35.477.0940.91%
4.35.480.0313.64%
4.1.361.2129.09%
4.2.425.2214.55%
3.2.315.014.55%
4.0.340.314.55%
3.1.293.114.55%
4.3.459.014.55%
4.35.477.814.55%
3.1.302.014.55%
4.35.480.1114.55%
Other00.00%

WebSTAR (21 servers)

Version Number of Servers Percent
Other21100.00%

MAILsweeper (11 servers)

Version Number of Servers Percent
4.3.17.0327.27%
4.3.20.0218.18%
4.3.19.0218.18%
4.3.14.0218.18%
4.3.1.019.09%
4.3.6.019.09%
Other00.00%

OpenSMTPD (5 servers)

Version Number of Servers Percent
Other5100.00%




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