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Mail (MX) Server Survey
November 1st, 2017

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 Queried2,017,196   100.0%
Number of Servers that didn't respond369,00718.29%
    Server didn't open socket359,51117.82%
    Server didn't provide banner9,4960.47%
Server provided banner1,648,18981.71%
Server banner identifies software in use1,016,14750.37%

As indicated by the above table, of the 2,017,196 servers queried, only 1,016,147 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
Exim575,52256.64%
Postfix341,88733.65%
Sendmail46,8944.61%
MailEnable22,8652.25%
MDaemon11,0621.09%
Microsoft8,8700.87%
IMail2,0130.20%
CommuniGate Pro1,7650.17%
XMail1,0230.10%
WinWebMail9400.09%
Lotus Domino9110.09%
SurgeSMTP5800.06%
Qmail Toaster4640.05%
Kerio4260.04%
Merak2630.03%
ArGoSoft1810.02%
Post.Office1530.02%
Gordano Messaging Suite (GMS)830.01%
GroupWise760.01%
Trend Micro640.01%
InterScan VirusWall260.00%
VisNetic220.00%
Mirapoint150.00%
OpenVMS110.00%
Mercury80.00%
WebSTAR V60.00%
Interscan60.00%
Neon Mail Server50.00%
MessageWall40.00%
ModusMail10.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (575,522 servers)

Version Number of Servers Percent
4.89338,21058.77%
4.87138,52824.07%
4.8821,5443.74%
4.8418,0503.14%
4.809,6251.67%
4.867,5091.30%
4.857,3711.28%
4.726,7661.18%
4.766,3611.11%
4.825,7761.00%
Other15,7822.74%

Postfix (341,887 servers)

Version Number of Servers Percent
Other341,887100.00%

Sendmail (46,894 servers)

Version Number of Servers Percent
8.14.512,16425.94%
8.14.410,66822.75%
8.13.87,21315.38%
8.13.14,5509.70%
8.15.22,9856.37%
8.14.32,1234.53%
8.14.71,9544.17%
8.14.91,3352.85%
Other3,9028.32%

MailEnable (22,865 servers)

Version Number of Servers Percent
9.00--3,07213.44%
9.16--1,6027.01%
8.60--1,1254.92%
8.53--9954.35%
6.5--8253.61%
8.51--6772.96%
1.986--5342.34%
9.75--4952.16%
8.04--4822.11%
8.60-8.60-4131.81%
8.50--3291.44%
5.10--3181.39%
9.74--3131.37%
9.53--2961.29%
8.00--2871.26%
Other11,10248.55%

MDaemon (11,062 servers)

Version Number of Servers Percent
16.5.27506.78%
17.5.06746.09%
17.0.26085.50%
13.5.15735.18%
13.6.35114.62%
11.0.04684.23%
11.0.34363.94%
13.0.44343.92%
13.0.54303.89%
17.0.33853.48%
16.0.43473.14%
16.5.12432.20%
12.5.62372.14%
12.5.42272.05%
15.0.32222.01%
14.5.21971.78%
10.0.01761.59%
17.0.01561.41%
10.1.21561.41%
16.0.11401.27%
15.5.31351.22%
10.1.11241.12%
13.0.21141.03%
Other3,31930.00%

Microsoft (8,870 servers)

Version Number of Servers Percent
6.0.3790.46755,22258.87%
7.5.7601.175141,10812.49%
8.5.9600.163847568.52%
6.0.3790.39596036.80%
8.0.9200.163841872.11%
5.0.2195.53291671.88%
7.0.6002.182641571.77%
6.0.3790.18301441.62%
Other5265.93%

IMail (2,013 servers)

Version Number of Servers Percent
12.5.5.11528113.96%
12.4.1.151768.74%
8.221527.55%
12.5.3.931477.30%
9.231336.61%
12.5.6.1011326.56%
12.5.4.1461316.51%
8.15964.77%
12.3.0.100954.72%
8.05683.38%
11.03542.68%
11.5492.43%
12.5.5.117331.64%
10.02281.39%
12.5.1.60271.34%
7.15271.34%
7.07271.34%
11.02221.09%
10.01221.09%
Other31315.55%

CommuniGate Pro (1,765 servers)

Version Number of Servers Percent
5.1.161307.37%
6.1.16.814.59%
6.1.16714.02%
6.2482.72%
6.1.18402.27%
6.1.18.372.10%
6.1.11362.04%
6.1.10341.93%
5.3.13.331.87%
5.4.11321.81%
5.4.11.321.81%
5.2.20311.76%
6.0.11.301.70%
6.1.17291.64%
6.0.11261.47%
6.1.15.251.42%
6.1.17.251.42%
6.1.2.251.42%
6.1.11.241.36%
5.2.20.241.36%
6.0.9.231.30%
5.1.16.231.30%
6.0.9211.19%
6.1.13201.13%
5.0.14.201.13%
6.1.14191.08%
6.1.13.181.02%
6.1.10.181.02%
5.2.3181.02%
Other77243.74%

XMail (1,023 servers)

Version Number of Servers Percent
1.2744143.11%
1.2233232.45%
1.25737.14%
1.26696.74%
1.24383.71%
1.21201.96%
1.23141.37%
Other363.52%

WinWebMail (940 servers)

Version Number of Servers Percent
3.9.0.720221.49%
3.8.1.313814.68%
3.9.0.1778.19%
3.8.0.1545.74%
3.7.6.1535.64%
3.8.1.5454.79%
3.9.5.1373.94%
3.8.1.1353.72%
3.9.2.1313.30%
3.8.5.1313.30%
3.7.3.1313.30%
3.8.6.1272.87%
3.9.3.1252.66%
3.7.7.3232.45%
3.8.2.1202.13%
3.8.3.1171.81%
3.7.1.1161.70%
3.8.3.3111.17%
3.7.0.5111.17%
Other565.96%

Lotus Domino (911 servers)

Version Number of Servers Percent
8.5.3FP617819.54%
8.5.312413.61%
8.5.2404.39%
7.0.2363.95%
8.5313.40%
8.5.1303.29%
8.5.3FP2252.74%
8.5.3FP1232.52%
7.0.3222.41%
8.5.3FP4222.41%
8.5.2FP4222.41%
8.5.3FP3212.31%
8.5.2FP3192.09%
8.5.3FP5171.87%
8.5.2FP2171.87%
8.0.1171.87%
8.0161.76%
7.0151.65%
8.5.1FP5111.21%
7.0.4111.21%
7.0.3FP1111.21%
6.5101.10%
6.5.1101.10%
Other18320.09%

SurgeSMTP (580 servers)

Version Number of Servers Percent
7.3c3-37613.10%
7.1e-17412.76%
7.2i-16310.86%
7.3e2-2417.07%
7.2a-1376.38%
6.5a2-2356.03%
7.2e-2264.48%
6.7c-1264.48%
6.9c-1203.45%
6.5a-1193.28%
7.0c2-2132.24%
3.9e-1122.07%
5.2a-1111.90%
6.1c-1111.90%
7.3d-5111.90%
4.0u4-491.55%
3.8k4-461.03%
6.4a-161.03%
Other8414.48%

Qmail Toaster (464 servers)

Version Number of Servers Percent
1.336278.02%
1.037716.59%
1.2102.16%
1.03.571.51%
Other81.72%

Kerio (426 servers)

Version Number of Servers Percent
6.7.39823.00%
6.7.05111.97%
6.6.2429.86%
6.5.2419.62%
6.7.2307.04%
6.5.0204.69%
6.6.1184.23%
6.7.1173.99%
6.4.1173.99%
6.3.1133.05%
6.3.0112.58%
6.4.0102.35%
6.5.1102.35%
6.6.092.11%
6.1.371.64%
6.4.251.17%
Other276.34%

Merak (263 servers)

Version Number of Servers Percent
8.0.37628.90%
8.9.14517.11%
8.5.0238.75%
7.5.2166.08%
8.3.8134.94%
7.4.5124.56%
7.6.1124.56%
7.6.4103.80%
9.0.341.52%
7.2.041.52%
4.4.131.14%
6.1.031.14%
7.6.031.14%
4.2.131.14%
7.4.231.14%
6.0.831.14%
4.4.231.14%
5.9.431.14%
7.0.131.14%
Other217.98%

ArGoSoft (181 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)6737.02%
1.8 (1.8.9.5)2111.60%
1.8 (1.8.9.3)2111.60%
1.8 (1.8.9.1)189.94%
1.8 (1.8.7.3)63.31%
1.8 (1.8.8.7)63.31%
1.8 (1.8.8.8)52.76%
1.8 (1.8.9.2)42.21%
1.8 (1.8.6.0)42.21%
1.8 (1.8.8.9)42.21%
1.8 (1.8.9.4)31.66%
1.8 (1.8.5.9)21.10%
1.8 (1.8.2.1)21.10%
1.8 (1.8.6.1a21.10%
1.8 (1.8.5.8)21.10%
1.8 (1.8.8.4)21.10%
Other126.63%

Post.Office (153 servers)

Version Number of Servers Percent
4.33220.92%
4.2.23120.26%
4.1.2.41912.42%
3.5.3149.15%
4.2.1.385.23%
4.2.1.153.27%
3.9.2.353.27%
3.1.242.61%
3.9.231.96%
3.5.131.96%
4.1.131.96%
3.5.3J21.31%
3.9.1.321.31%
3.8.7.421.31%
4.1.2.321.31%
4.1.0.321.31%
4.0.121.31%
3.5.421.31%
4.221.31%
Other106.54%

Gordano Messaging Suite (GMS) (83 servers)

Version Number of Servers Percent
Other83100.00%

GroupWise (76 servers)

Version Number of Servers Percent
14.2.22127.63%
14.2.1810.53%
6.5.779.21%
14.0.156.58%
14.2.056.58%
14.0.045.26%
7.0.333.95%
6.0.422.63%
8.0.222.63%
12.0.122.63%
7.0.222.63%
7.0.422.63%
14.0.222.63%
6.0.222.63%
6.5.211.32%
8.0.111.32%
12.0.211.32%
7.0.111.32%
8.0.311.32%
6.5.011.32%
6.0.311.32%
6.5.511.32%
12.0.411.32%
Other00.00%

Trend Micro (64 servers)

Version Number of Servers Percent
5.72031.25%
5.181320.31%
5.51117.19%
7.0812.50%
7.569.38%
3.5323.12%
9.011.56%
811.56%
8.511.56%
7.111.56%
Other00.00%

InterScan VirusWall (26 servers)

Version Number of Servers Percent
Other26100.00%

VisNetic (22 servers)

Version Number of Servers Percent
9.3.2.0731.82%
5.5.8.329.09%
5.0.2.329.09%
8.5.0.814.55%
5.0.2.014.55%
8.0.3.114.55%
5.3.5.014.55%
9.1.4.114.55%
8.5.0.514.55%
6.2.2.014.55%
8.0.314.55%
5.8.6.614.55%
9.1.4.014.55%
7.6.1.014.55%
Other00.00%

Mirapoint (15 servers)

Version Number of Servers Percent
4.4.2a-FCS426.67%
4.4.3-GA320.00%
4.3.5-GA320.00%
4.4.6-GA16.67%
3.7.5a-GA16.67%
4.4.4-GA16.67%
3.10.10a-GA16.67%
4.4.3a-GA16.67%
Other00.00%

OpenVMS (11 servers)

Version Number of Servers Percent
7.3654.55%
8.4327.27%
8.319.09%
8.219.09%
Other00.00%

Mercury (8 servers)

Version Number of Servers Percent
3.32450.00%
1.48225.00%
4.x112.50%
3.21112.50%
Other00.00%

WebSTAR V (6 servers)

Version Number of Servers Percent
5.4.1350.00%
5.3.4116.67%
5.4.0116.67%
5.3.2116.67%
Other00.00%

Interscan (6 servers)

Version Number of Servers Percent
3.81-Build_1022233.33%
3.5 (build 1294)116.67%
3.8-Build_1080116.67%
3.8-Build_3013116.67%
3.81-Build_1084116.67%
Other00.00%

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.0240.00%
3.1.2120.00%
3.0.7120.00%
3.1.3120.00%
Other00.00%

MessageWall (4 servers)

Version Number of Servers Percent
1.0.84100.00%
Other00.00%

ModusMail (1 servers)

Version Number of Servers Percent
4.1.361.211100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%




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