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Mail (MX) Server Survey
July 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 Queried2,269,287   100.0%
Number of Servers that didn't respond372,72116.42%
    Server didn't open socket360,37015.88%
    Server didn't provide banner12,3510.54%
Server provided banner1,896,56683.58%
Server banner identifies software in use1,032,57745.50%

As indicated by the above table, of the 2,269,287 servers queried, only 1,032,577 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
Exim419,91140.67%
Postfix234,94022.75%
Microsoft145,14414.06%
Sendmail138,24313.39%
MailEnable33,0893.20%
MDaemon22,0572.14%
IMail10,6621.03%
Lotus Domino5,1150.50%
WinWebMail4,4130.43%
CommuniGate Pro3,5730.35%
Kerio2,6920.26%
XMail2,4820.24%
Merak1,9680.19%
Qmail Toaster1,7780.17%
SurgeSMTP1,2730.12%
ArGoSoft1,1340.11%
GroupWise9790.09%
Trend Micro6020.06%
Gordano Messaging Suite (GMS)4880.05%
Post.Office4790.05%
MagicMail3790.04%
Mirapoint2690.03%
VisNetic2330.02%
InterScan VirusWall2070.02%
NetIQ MailMarshal990.01%
Interscan820.01%
Mercury770.01%
WebSTAR V500.00%
Neon Mail Server500.00%
OpenVMS250.00%
MessageWall240.00%
WebSTAR220.00%
ModusMail200.00%
MAILsweeper110.00%
OpenSMTPD70.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (419,911 servers)

Version Number of Servers Percent
4.69355,69884.71%
4.7220,5034.88%
4.6710,9522.61%
4.768,5542.04%
4.636,1461.46%
4.714,3861.04%
Other13,6723.26%

Postfix (234,940 servers)

Version Number of Servers Percent
Other234,940100.00%

Microsoft (145,144 servers)

Version Number of Servers Percent
6.0.3790.4675108,52474.77%
6.0.3790.395923,69916.33%
6.0.3790.18306,4554.45%
5.0.2195.73811,9301.33%
Other4,5363.13%

Sendmail (138,243 servers)

Version Number of Servers Percent
8.13.831,65322.90%
8.13.124,33717.60%
8.14.318,78013.58%
8.14.418,45413.35%
8.12.11.200603086,5914.77%
8.13.6.200606144,9843.61%
8.14.24,0552.93%
8.11.63,6332.63%
8.12.103,5882.60%
8.13.63,1022.24%
8.14.12,9192.11%
8.12.11.200606142,6821.94%
8.13.72,1251.54%
8.12.112,1051.52%
8.13.42,0311.47%
8.12.81,7331.25%
Other5,4713.96%

MailEnable (33,089 servers)

Version Number of Servers Percent
1.986--10,57031.94%
4.26--2,4997.55%
1.981--2,3076.97%
1.983--1,4504.38%
3.62--9742.94%
0-3.63-9222.79%
5.10--6501.96%
0-4.26-6011.82%
4.22--5741.73%
4.23--5311.60%
0-1.87-4361.32%
0-2.53-4241.28%
1.95--4121.25%
1.96--4111.24%
4.14--3831.16%
--3.633811.15%
5.11--3591.08%
0-5.10-3431.04%
Other8,86226.78%

MDaemon (22,057 servers)

Version Number of Servers Percent
11.0.33,74116.96%
12.0.32,32010.52%
11.0.01,1845.37%
10.1.21,1795.35%
10.0.01,0884.93%
12.0.19494.30%
10.1.19044.10%
12.0.27503.40%
9.6.16953.15%
9.6.66262.84%
12.0.05472.48%
10.1.05412.45%
10.0.54301.95%
9.6.54281.94%
9.5.24281.94%
10.0.23891.76%
9.6.23591.63%
9.5.63591.63%
9.5.13491.58%
9.6.43421.55%
10.0.43281.49%
8.1.33061.39%
9.0.42871.30%
11.0.22761.25%
Other3,25214.74%

IMail (10,662 servers)

Version Number of Servers Percent
8.222,03719.11%
8.157737.25%
11.037607.13%
11.027487.02%
9.237146.70%
11.55495.15%
11.015274.94%
8.054904.60%
9.104374.10%
10.023943.70%
9.203853.61%
11.03233.03%
7.072812.64%
9.212702.53%
7.152472.32%
8.002101.97%
6.062041.91%
10.011551.45%
8.041411.32%
Other1,0179.54%

Lotus Domino (5,115 servers)

Version Number of Servers Percent
8.5.258711.48%
8.5.2FP24388.56%
8.5.14108.02%
8.5.2FP13166.18%
7.0.22975.81%
8.52775.42%
7.0.31703.32%
8.0.21422.78%
8.0.11402.74%
7.0.11362.66%
6.5.41352.64%
8.5.1FP31312.56%
6.5.11212.37%
6.5.31122.19%
8.5.1FP51011.97%
8.0981.92%
7.0911.78%
6.5.5871.70%
7.0.3FP1811.58%
7.0.2FP2801.56%
8.5.1FP2781.52%
8.5.1FP4751.47%
6.5671.31%
8.5FP1531.04%
Other89217.44%

WinWebMail (4,413 servers)

Version Number of Servers Percent
3.8.0.187919.92%
3.8.1.377817.63%
3.7.6.163314.34%
3.7.3.144410.06%
3.7.7.34389.93%
3.8.1.13989.02%
3.7.1.12054.65%
3.7.5.11563.54%
3.7.7.11162.63%
3.6.3.11062.40%
3.7.0.5892.02%
3.7.0.3781.77%
3.7.0.7641.45%
Other290.66%

CommuniGate Pro (3,573 servers)

Version Number of Servers Percent
5.1.162617.30%
5.3.132376.63%
4.1.81895.29%
5.41243.47%
5.3.81203.36%
5.2.161123.13%
5.2.201083.02%
4.2.101022.85%
5.3.12972.71%
5.3.10922.57%
5.2.19842.35%
5.1.12782.18%
5.3.9772.16%
5.0.14752.10%
5.3.11742.07%
5.2.3691.93%
5.2.14671.88%
5.2.12661.85%
5.2.8581.62%
5.1.13541.51%
5.4.0521.46%
5.3.7501.40%
5.2.13471.32%
5.3.2431.20%
5.2.10421.18%
5.1.14401.12%
5.2.18391.09%
5.3.5381.06%
5.2.0371.04%
Other1,04129.14%

Kerio (2,692 servers)

Version Number of Servers Percent
6.7.335313.11%
6.6.229711.03%
6.7.02479.18%
6.7.21947.21%
6.5.01927.13%
6.5.21686.24%
6.3.11415.24%
6.4.11405.20%
6.7.11395.16%
6.4.01063.94%
6.6.01003.71%
6.5.1893.31%
6.6.1692.56%
6.4.2622.30%
6.3.0521.93%
6.2.2361.34%
6.2.0291.08%
6.1.3281.04%
6.1.4271.00%
6.1.2271.00%
6.0.10271.00%
Other1696.28%

XMail (2,482 servers)

Version Number of Servers Percent
1.2259323.89%
1.2551720.83%
1.2734814.02%
1.2632413.05%
1.2427611.12%
1.211084.35%
1.23712.86%
1.20592.38%
1.17461.85%
1.12391.57%
Other1014.07%

Merak (1,968 servers)

Version Number of Servers Percent
8.0.380941.11%
8.9.11929.76%
8.5.01346.81%
7.5.2934.73%
7.6.4834.22%
8.3.8763.86%
7.4.5753.81%
8.2.13462.34%
9.0.0331.68%
7.4.2301.52%
8.2.4261.32%
7.2.0241.22%
7.6.1241.22%
8.3.15241.22%
8.9.0211.07%
7.0.1201.02%
Other25813.11%

Qmail Toaster (1,778 servers)

Version Number of Servers Percent
1.31,66293.48%
1.2834.67%
1.0221.24%
Other110.62%

SurgeSMTP (1,273 servers)

Version Number of Servers Percent
5.2a-141032.21%
3.9e-11108.64%
4.2d4-4907.07%
5.0e4-4584.56%
3.8k4-4524.08%
4.0u4-4453.53%
4.2d2-2302.36%
3.8i3-3262.04%
5.0e3-3262.04%
5.1c2-2251.96%
4.3g4-4251.96%
4.3g2-2221.73%
5.3f-1201.57%
3.7b8-8181.41%
4.3e-1181.41%
3.6f5-5161.26%
3.9c-1161.26%
5.1c-1161.26%
4.2a3-3151.18%
3.9h-18151.18%
5.3b2-2141.10%
3.8f2-2131.02%
Other19315.16%

ArGoSoft (1,134 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)25022.05%
1.8 (1.8.9.5)17415.34%
1.8 (1.8.9.3)14112.43%
1.8 (1.8.9.1)1059.26%
1.8 (1.8.8.8)867.58%
1.8 (1.8.8.7)655.73%
1.8 (1.8.9.2)474.14%
1.8 (1.8.9.4)292.56%
1.8 (1.8.8.1)201.76%
1.8 (1.8.6.0)181.59%
1.8 (1.8.8.9)181.59%
1.8 (1.8.9.0)161.41%
1.8 (1.8.8.2)131.15%
Other15213.40%

GroupWise (979 servers)

Version Number of Servers Percent
7.0.324024.51%
8.0.217617.98%
6.5.711011.24%
7.0.2828.38%
8.0.1676.84%
7.0.4545.52%
7.0.1404.09%
6.5.4393.98%
6.5.6313.17%
6.0.4262.66%
8.0.0242.45%
6.5.1242.45%
6.5.5161.63%
7.0121.23%
Other383.88%

Trend Micro (602 servers)

Version Number of Servers Percent
5.724741.03%
5.516026.58%
5.1810918.11%
7.0548.97%
7.1162.66%
Other162.66%

Gordano Messaging Suite (GMS) (488 servers)

Version Number of Servers Percent
Other488100.00%

Post.Office (479 servers)

Version Number of Servers Percent
3.5.37916.49%
4.1.0.25611.69%
4.0.1428.77%
4.1.2.4265.43%
3.5.3J224.59%
4.1.1224.59%
3.8.3193.97%
3.9.2.3153.13%
3.9.2132.71%
3.9.1122.51%
3.1.2J102.09%
3.8.7.4102.09%
4.0.1.1102.09%
4.1.0.3102.09%
4.191.88%
4.1.0.491.88%
3.6.291.88%
3.1.291.88%
3.9.2.181.67%
4.0.0.271.46%
4.1.2.371.46%
4.0.0.161.25%
3.9.1.361.25%
4.1.2.261.25%
3.5.261.25%
3.6.351.04%
3.9.1.251.04%
Other418.56%

MagicMail (379 servers)

Version Number of Servers Percent
Other379100.00%

Mirapoint (269 servers)

Version Number of Servers Percent
3.8.4-GA259.29%
3.10.5-GA238.55%
3.10.10a-GA207.43%
3.10.8-GA197.06%
3.8.3-GA186.69%
4.2.3-GA165.95%
3.10.9-GA155.58%
4.1.3-GA134.83%
4.1.10-GA134.83%
3.10.7-GA114.09%
4.1.8-GA103.72%
4.1.9-GA103.72%
3.10.4-GA82.97%
3.10.3-GA72.60%
3.10.6-GA72.60%
3.8.7a62.23%
3.8.6-GA62.23%
4.1.4-GA62.23%
3.8.2-GA62.23%
3.7.3a-GA51.86%
3.8.5-GA51.86%
4.3.1a-FCS31.12%
4.1.5-GA31.12%
3.7.5a-GA31.12%
Other114.09%

VisNetic (233 servers)

Version Number of Servers Percent
9.3.2.08134.76%
9.1.4.13213.73%
5.8.6.6177.30%
8.5.0.8114.72%
5.5.8.3104.29%
8.0.3.173.00%
8.0.3.073.00%
7.6.1.073.00%
5.3.5.052.15%
8.3.5.052.15%
5.0.2.352.15%
8.0.352.15%
6.2.2.041.72%
9.1.4.041.72%
5.0.2.141.72%
5.4.5.431.29%
7.2.4.031.29%
7.2.4.131.29%
Other208.58%

InterScan VirusWall (207 servers)

Version Number of Servers Percent
Other207100.00%

NetIQ MailMarshal (99 servers)

Version Number of Servers Percent
6.0.3.87070.71%
6.1.3.1577.07%
5.5.6.777.07%
5.5.4.1655.05%
5.5.6.633.03%
5.5.3.1722.02%
6.5.4.753511.01%
5.5.5.811.01%
5.5.4.1711.01%
5.5.6.511.01%
5.5.5.611.01%
Other00.00%

Interscan (82 servers)

Version Number of Servers Percent
3.55 (build 1016)1720.73%
3.81-Build_10221214.63%
3.55 (build 1029)910.98%
3.53 (build 2017)89.76%
3.81-Build_108467.32%
3.8-Build_301356.10%
3.52 (build 1375)44.88%
3.55 (build 1020)33.66%
3.53 (build 2011)33.66%
3.53 (build 1493)33.66%
3.53 (build 2013)22.44%
3.8-Build_108022.44%
3.51 (build 1321)11.22%
3.55 (build 2003)11.22%
3.81-Build_105511.22%
3.53 (build 1494)11.22%
3.6-Build_124611.22%
3.81-Build_103211.22%
3.8-Build_304511.22%
3.6-Build_120711.22%
Other00.00%

Mercury (77 servers)

Version Number of Servers Percent
1.484355.84%
3.321924.68%
3.21c45.19%
3.2122.60%
3.01a22.60%
1.4722.60%
3.3022.60%
1.4411.30%
3.3111.30%
1.4911.30%
Other00.00%

WebSTAR V (50 servers)

Version Number of Servers Percent
5.4.12040.00%
5.4.01122.00%
5.3.4612.00%
5.3.3510.00%
5.3.2510.00%
5.3.124.00%
5.3.012.00%
Other00.00%

Neon Mail Server (50 servers)

Version Number of Servers Percent
3.1.31224.00%
3.0.71122.00%
3.0.9612.00%
3.1.0510.00%
3.1.2510.00%
3.1.448.00%
3.0.624.00%
3.1.124.00%
3.1.524.00%
3.0.812.00%
Other00.00%

OpenVMS (25 servers)

Version Number of Servers Percent
8.31352.00%
7.3832.00%
8.428.00%
6.114.00%
8.214.00%
Other00.00%

MessageWall (24 servers)

Version Number of Servers Percent
1.0.82395.83%
1.0.614.17%
Other00.00%

WebSTAR (22 servers)

Version Number of Servers Percent
Other22100.00%

ModusMail (20 servers)

Version Number of Servers Percent
4.35.477.0735.00%
4.35.480.0315.00%
4.1.361.21210.00%
4.2.425.2215.00%
3.2.315.015.00%
4.0.340.315.00%
3.1.293.115.00%
4.3.459.015.00%
4.35.477.815.00%
3.1.302.015.00%
4.35.480.1115.00%
Other00.00%

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 (7 servers)

Version Number of Servers Percent
Other7100.00%




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