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Mail (MX) Server Survey
August 1st, 2019

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 Queried1,775,165   100.0%
Number of Servers that didn't respond417,76823.53%
    Server didn't open socket409,25423.05%
    Server didn't provide banner8,5140.48%
Server provided banner1,357,39776.47%
Server banner identifies software in use838,30747.22%

As indicated by the above table, of the 1,775,165 servers queried, only 838,307 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
Exim479,36557.18%
Postfix287,63834.31%
Sendmail35,0434.18%
MailEnable18,0572.15%
MDaemon7,1830.86%
Microsoft4,6730.56%
IMail1,3940.17%
CommuniGate Pro1,2060.14%
XMail7680.09%
Qmail Toaster5540.07%
Lotus Domino4910.06%
SurgeSMTP4710.06%
WinWebMail4630.06%
Kerio2410.03%
Merak1670.02%
MagicMail1540.02%
Post.Office1180.01%
ArGoSoft1040.01%
GroupWise660.01%
Gordano Messaging Suite (GMS)470.01%
Trend Micro460.01%
InterScan VirusWall140.00%
VisNetic130.00%
OpenVMS90.00%
Mercury40.00%
WebSTAR V40.00%
Mirapoint40.00%
Interscan30.00%
ModusMail20.00%
MessageWall20.00%
Neon Mail Server20.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (479,365 servers)

Version Number of Servers Percent
4.92349,99973.01%
4.9162,22812.98%
4.8716,1473.37%
4.8910,1932.13%
4.849,6212.01%
4.905,2221.09%
Other25,9555.41%

Postfix (287,638 servers)

Version Number of Servers Percent
Other287,638100.00%

Sendmail (35,043 servers)

Version Number of Servers Percent
8.15.211,85833.84%
8.14.46,79519.39%
8.13.83,90811.15%
8.14.52,8598.16%
8.14.72,7477.84%
8.13.12,4737.06%
8.14.91,4794.22%
8.14.37162.04%
Other2,2086.30%

MailEnable (18,057 servers)

Version Number of Servers Percent
10.12--4,33824.02%
9.00--1,3317.37%
9.16--1,0896.03%
8.60--4462.47%
8.53--3692.04%
6.5--3361.86%
10.20--2971.64%
8.51--2861.58%
8.60-8.60-2781.54%
10.25--2561.42%
10.25--10.252481.37%
10.25-10.25-2271.26%
1.986--2061.14%
10.16--2061.14%
8.04--1951.08%
10.23--1931.07%
10.18--1921.06%
9.00--9.001881.04%
Other7,37640.85%

MDaemon (7,183 servers)

Version Number of Servers Percent
19.0.25788.05%
13.5.14366.07%
13.6.33885.40%
13.0.42964.12%
13.0.52863.98%
11.0.32683.73%
11.0.02663.70%
19.0.12453.41%
16.5.22303.20%
18.5.31922.67%
12.5.41732.41%
18.5.21572.19%
12.5.61562.17%
14.5.21472.05%
18.5.11421.98%
19.0.01371.91%
15.0.31051.46%
10.1.21021.42%
16.0.41001.39%
18.0.2991.38%
10.0.0961.34%
16.5.1761.06%
10.1.0731.02%
13.0.2731.02%
Other2,36232.88%

Microsoft (4,673 servers)

Version Number of Servers Percent
6.0.3790.46752,17546.54%
7.5.7601.1751460813.01%
8.5.9600.1638460412.93%
6.0.3790.39592826.03%
10.0.14393.26081954.17%
8.0.9200.163841382.95%
5.0.2195.53291302.78%
7.0.6002.18264821.75%
6.0.3790.1830811.73%
5.0.2195.6713551.18%
10.0.14393.0521.11%
5.0.2195.7381491.05%
Other2224.75%

IMail (1,394 servers)

Version Number of Servers Percent
12.5.6.10120514.71%
8.221389.90%
12.4.1.151289.18%
12.5.7.591027.32%
12.5.5.115846.03%
12.5.3.93846.03%
12.3.0.100725.16%
9.23694.95%
8.15604.30%
12.5.4.146523.73%
8.05423.01%
11.03402.87%
12.5.7.58312.22%
12.5.5.117221.58%
10.02201.43%
11.5201.43%
10.01171.22%
7.15151.08%
12.5.6.105151.08%
Other17812.77%

CommuniGate Pro (1,206 servers)

Version Number of Servers Percent
6.2.12554.56%
6.2.12.393.23%
5.3.13.352.90%
6.1.16.332.74%
5.4.11241.99%
6.0.11241.99%
5.4.11.231.91%
6.0.11.231.91%
5.1.16201.66%
6.1.18201.66%
6.1.16191.58%
5.2.20.191.58%
6.2.10181.49%
6.1.20181.49%
6.2.13.151.24%
6.2.13151.24%
6.1.2.151.24%
6.1.10151.24%
5.2.20151.24%
6.2.7151.24%
6.1.18.141.16%
6.0.9141.16%
Other71859.54%

XMail (768 servers)

Version Number of Servers Percent
1.2736147.01%
1.2225232.81%
1.25465.99%
1.26445.73%
1.24283.65%
1.2191.17%
Other283.65%

Qmail Toaster (554 servers)

Version Number of Servers Percent
1.342777.08%
1.0311019.86%
1.03.581.44%
Other91.62%

Lotus Domino (491 servers)

Version Number of Servers Percent
8.5.3FP610220.77%
8.5.37415.07%
8.5.2255.09%
7.0.2224.48%
8.5204.07%
8.5.1173.46%
8.5.3FP2142.85%
8.5.3FP1132.65%
8.5.2FP2112.24%
8.5.3FP3102.04%
7.0102.04%
8.0.1102.04%
8.5.2FP491.83%
8.5.3FP491.83%
8.5.2FP381.63%
7.0.381.63%
8.5.1FP571.43%
8.061.22%
8.5.3FP561.22%
8.5.2FP4HF75961.22%
6.5.461.22%
7.0.3FP151.02%
8.5.1FP451.02%
6.5.551.02%
8.0.251.02%
Other7815.89%

SurgeSMTP (471 servers)

Version Number of Servers Percent
7.3o4-414330.36%
7.3e2-26413.59%
7.1e-1306.37%
7.3i2-2285.94%
6.5a2-2245.10%
6.7c-1173.61%
7.2a-1153.18%
7.2i-1132.76%
6.9c-1102.12%
3.9e-191.91%
7.0c2-281.70%
7.2e-281.70%
6.1c-171.49%
6.5a-171.49%
5.2a-171.49%
4.0u4-461.27%
6.4a-161.27%
Other6914.65%

WinWebMail (463 servers)

Version Number of Servers Percent
3.9.0.77816.85%
4.2.0.17315.77%
3.8.1.3439.29%
3.9.0.1347.34%
3.8.0.1275.83%
3.7.6.1224.75%
3.8.1.5214.54%
4.0.0.1143.02%
4.1.0.1143.02%
3.8.6.1122.59%
3.9.2.1122.59%
3.8.5.1122.59%
3.8.1.1122.59%
3.8.3.1112.38%
3.7.3.1112.38%
3.7.7.3102.16%
3.9.3.191.94%
3.9.5.371.51%
3.8.2.171.51%
3.7.1.151.08%
Other296.26%

Kerio (241 servers)

Version Number of Servers Percent
6.7.35623.24%
6.7.03313.69%
6.6.2249.96%
6.7.2249.96%
6.5.2229.13%
6.4.1124.98%
6.5.0104.15%
6.3.183.32%
6.6.183.32%
6.7.172.90%
6.4.052.07%
6.6.052.07%
6.5.152.07%
6.1.031.24%
5.7.931.24%
6.3.031.24%
6.1.331.24%
Other104.15%

Merak (167 servers)

Version Number of Servers Percent
8.0.34225.15%
8.9.13520.96%
8.5.0127.19%
7.4.5105.99%
7.6.1105.99%
9.0.374.19%
7.5.263.59%
8.3.863.59%
7.6.442.40%
7.4.231.80%
6.0.831.80%
7.0.131.80%
7.2.031.80%
7.6.031.80%
4.4.121.20%
Other1810.78%

MagicMail (154 servers)

Version Number of Servers Percent
Other154100.00%

Post.Office (118 servers)

Version Number of Servers Percent
4.33126.27%
4.2.22117.80%
4.1.2.41411.86%
4.41311.02%
3.5.397.63%
4.2.1.343.39%
3.5.3J32.54%
4.1.121.69%
3.9.221.69%
4.2.1.121.69%
3.5.121.69%
3.8.7.421.69%
Other1311.02%

ArGoSoft (104 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)3533.65%
1.8 (1.8.9.3)1817.31%
1.8 (1.8.9.5)1413.46%
1.8 (1.8.9.1)87.69%
1.8 (1.8.8.8)32.88%
1.8 (1.8.7.3)32.88%
1.8 (1.8.6.0)32.88%
1.8 (1.8.2.1)21.92%
1.8 (1.8.9.2)21.92%
1.8 (1.8.5.8)21.92%
1.8 (1.8.8.7)21.92%
1.8 (1.8.8.9)21.92%
Other109.62%

GroupWise (66 servers)

Version Number of Servers Percent
18.0.2913.64%
14.2.2913.64%
18.1.0710.61%
14.2.169.09%
14.2.369.09%
18.1.146.06%
14.2.046.06%
6.5.734.55%
7.0.323.03%
14.0.123.03%
18.0.123.03%
14.0.211.52%
6.0.211.52%
14.0.011.52%
8.0.311.52%
6.5.211.52%
6.5.511.52%
6.5.611.52%
7.0.111.52%
12.0.111.52%
7.0.411.52%
6.5.011.52%
6.0.411.52%
Other00.00%

Gordano Messaging Suite (GMS) (47 servers)

Version Number of Servers Percent
Other47100.00%

Trend Micro (46 servers)

Version Number of Servers Percent
5.181226.09%
5.71123.91%
5.5817.39%
7.5510.87%
7.0510.87%
8.512.17%
7.5ready12.17%
812.17%
9.012.17%
7.112.17%
Other00.00%

InterScan VirusWall (14 servers)

Version Number of Servers Percent
Other14100.00%

VisNetic (13 servers)

Version Number of Servers Percent
9.3.2.0861.54%
8.0.317.69%
5.0.2.317.69%
9.1.4.017.69%
5.5.8.317.69%
6.2.2.017.69%
Other00.00%

OpenVMS (9 servers)

Version Number of Servers Percent
8.4444.44%
7.3333.33%
8.3111.11%
8.2111.11%
Other00.00%

Mercury (4 servers)

Version Number of Servers Percent
3.32375.00%
1.48125.00%
Other00.00%

WebSTAR V (4 servers)

Version Number of Servers Percent
5.4.14100.00%
Other00.00%

Mirapoint (4 servers)

Version Number of Servers Percent
4.3.6-GA125.00%
3.10.10a-GA125.00%
4.3.5-GA125.00%
4.4.6-GA125.00%
Other00.00%

Interscan (3 servers)

Version Number of Servers Percent
3.81-Build_1022266.67%
3.8-Build_3013133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

Neon Mail Server (2 servers)

Version Number of Servers Percent
3.0.7150.00%
3.1.0150.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%




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