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Mail (MX) Server Survey
September 1st, 2018

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 Queried1,838,775   100.0%
Number of Servers that didn't respond317,26617.25%
    Server didn't open socket308,06916.75%
    Server didn't provide banner9,1970.50%
Server provided banner1,521,50982.75%
Server banner identifies software in use943,49151.31%

As indicated by the above table, of the 1,838,775 servers queried, only 943,491 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
Exim537,68156.99%
Postfix321,79934.11%
Sendmail39,9944.24%
MailEnable20,7372.20%
MDaemon9,1570.97%
Microsoft6,4430.68%
IMail1,6970.18%
CommuniGate Pro1,4860.16%
XMail9070.10%
Lotus Domino6840.07%
WinWebMail6740.07%
SurgeSMTP5200.06%
Qmail Toaster4330.05%
Kerio3320.04%
Merak2220.02%
MagicMail1640.02%
ArGoSoft1440.02%
Post.Office1330.01%
GroupWise760.01%
Gordano Messaging Suite (GMS)640.01%
Trend Micro550.01%
InterScan VirusWall230.00%
VisNetic180.00%
OpenVMS120.00%
Mirapoint80.00%
Mercury70.00%
Interscan60.00%
Neon Mail Server50.00%
WebSTAR V50.00%
MessageWall30.00%
ModusMail10.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (537,681 servers)

Version Number of Servers Percent
4.91391,33172.78%
4.8942,3077.87%
4.8734,3536.39%
4.9014,7582.74%
4.8413,8652.58%
4.805,8981.10%
4.865,5981.04%
Other29,5715.50%

Postfix (321,799 servers)

Version Number of Servers Percent
Other321,799100.00%

Sendmail (39,994 servers)

Version Number of Servers Percent
8.15.211,47328.69%
8.14.48,57521.44%
8.13.85,44113.60%
8.13.13,3888.47%
8.14.53,3398.35%
8.14.72,2315.58%
8.14.91,6694.17%
8.14.31,0162.54%
Other2,8627.16%

MailEnable (20,737 servers)

Version Number of Servers Percent
9.00--2,29911.09%
9.16--2,0129.70%
10.12--1,7148.27%
8.60--7163.45%
8.53--7083.41%
6.5--5582.69%
8.51--5012.42%
10.16--3881.87%
8.60-8.60-3541.71%
8.04--3481.68%
1.986--3251.57%
9.75--3061.48%
10.14--2441.18%
10.15--2391.15%
8.50--2171.05%
9.00--9.002111.02%
Other9,59746.28%

MDaemon (9,157 servers)

Version Number of Servers Percent
18.0.291810.03%
13.5.15125.59%
13.6.34394.79%
16.5.24024.39%
13.0.43734.07%
11.0.33613.94%
13.0.53583.91%
11.0.03543.87%
17.5.22332.54%
18.0.12132.33%
12.5.61972.15%
17.5.31932.11%
12.5.41932.11%
16.0.41852.02%
14.5.21791.95%
15.0.31641.79%
10.0.01381.51%
10.1.21361.49%
16.5.11351.47%
17.5.11261.38%
18.0.01231.34%
17.0.21171.28%
10.1.01111.21%
16.0.11071.17%
13.0.2991.08%
10.1.1941.03%
Other2,69729.45%

Microsoft (6,443 servers)

Version Number of Servers Percent
6.0.3790.46753,41553.00%
7.5.7601.1751484913.18%
8.5.9600.1638471211.05%
6.0.3790.39594096.35%
8.0.9200.163841682.61%
10.0.14393.01612.50%
5.0.2195.53291442.23%
7.0.6002.182641111.72%
6.0.3790.18301021.58%
5.0.2195.6713661.02%
Other3064.75%

IMail (1,697 servers)

Version Number of Servers Percent
12.5.6.10128316.68%
8.2217610.37%
12.4.1.151559.13%
12.5.5.1151317.72%
9.231136.66%
12.5.3.93985.77%
12.3.0.100865.07%
12.5.4.146834.89%
8.15794.66%
8.05513.01%
11.03482.83%
11.5281.65%
12.5.5.117271.59%
7.07241.41%
10.02201.18%
7.15191.12%
10.01181.06%
8.00171.00%
Other24114.20%

CommuniGate Pro (1,486 servers)

Version Number of Servers Percent
6.1.16.543.63%
6.1.16402.69%
5.3.13.352.36%
6.0.11.342.29%
6.1.18332.22%
6.1.18.291.95%
5.4.11281.88%
6.1.11271.82%
5.4.11.261.75%
6.2.1261.75%
6.0.11251.68%
5.2.20.221.48%
6.2.5.221.48%
6.1.10211.41%
6.1.19211.41%
6.1.11.201.35%
6.2.4191.28%
5.2.20191.28%
6.1.19.191.28%
6.0.9181.21%
5.1.16.171.14%
6.2.0171.14%
5.1.16171.14%
6.2.5171.14%
6.0.9.171.14%
6.2.6.161.08%
6.1.2.161.08%
5.2.3161.08%
Other81554.85%

XMail (907 servers)

Version Number of Servers Percent
1.2741545.76%
1.2228631.53%
1.25647.06%
1.26576.28%
1.24333.64%
1.21151.65%
1.23101.10%
Other272.98%

Lotus Domino (684 servers)

Version Number of Servers Percent
8.5.3FP613119.15%
8.5.310114.77%
8.5.2344.97%
7.0.2273.95%
8.5.1253.65%
8.5243.51%
8.5.3FP2202.92%
8.5.3FP3172.49%
7.0.3162.34%
8.5.2FP4152.19%
8.5.3FP1152.19%
8.5.3FP4142.05%
8.5.2FP3142.05%
8.5.2FP2131.90%
8.0.1111.61%
8.0111.61%
7.0111.61%
6.5101.46%
6.5.591.32%
7.0.191.32%
6.5.481.17%
8.5.1FP581.17%
6.5.171.02%
8.0.271.02%
7.0.471.02%
8.5.3FP571.02%
7.0.3FP171.02%
Other10615.50%

WinWebMail (674 servers)

Version Number of Servers Percent
3.9.0.714020.77%
3.8.1.38913.20%
3.9.0.1487.12%
3.8.0.1405.93%
3.7.6.1334.90%
4.0.0.1314.60%
4.2.0.1294.30%
4.1.0.1284.15%
3.8.1.5263.86%
3.8.5.1202.97%
3.7.3.1192.82%
3.8.6.1182.67%
3.9.5.3162.37%
3.8.1.1162.37%
3.9.3.1152.23%
3.7.7.3142.08%
3.8.2.1131.93%
3.8.3.1121.78%
3.9.2.1111.63%
3.7.1.191.34%
3.7.5.171.04%
Other405.93%

SurgeSMTP (520 servers)

Version Number of Servers Percent
7.3e2-215630.00%
7.3i2-2448.46%
7.1e-1397.50%
6.5a2-2326.15%
7.2i-1254.81%
6.7c-1234.42%
7.2a-1214.04%
7.0c2-2142.69%
7.2e-2142.69%
3.9e-1122.31%
6.9c-1122.31%
6.5a-1112.12%
5.2a-1101.92%
7.3h-691.73%
6.1c-181.54%
6.4a-181.54%
4.0u4-471.35%
7.3c3-361.15%
7.3j-761.15%
Other6312.12%

Qmail Toaster (433 servers)

Version Number of Servers Percent
1.331672.98%
1.039421.71%
1.281.85%
1.03.571.62%
1.03.651.15%
Other30.69%

Kerio (332 servers)

Version Number of Servers Percent
6.7.36318.98%
6.7.04914.76%
6.6.23610.84%
6.5.2339.94%
6.7.2278.13%
6.4.1164.82%
6.6.1164.82%
6.5.0164.82%
6.7.1123.61%
6.3.1103.01%
6.4.082.41%
6.5.172.11%
6.3.061.81%
6.6.061.81%
6.1.341.20%
5.7.941.20%
Other195.72%

Merak (222 servers)

Version Number of Servers Percent
8.0.36629.73%
8.9.14218.92%
8.5.0156.76%
8.3.8114.95%
7.6.1114.95%
7.5.2104.50%
7.4.5104.50%
7.6.473.15%
9.0.362.70%
7.4.241.80%
7.2.041.80%
7.6.031.35%
4.2.131.35%
6.0.831.35%
7.0.131.35%
Other2410.81%

MagicMail (164 servers)

Version Number of Servers Percent
Other164100.00%

ArGoSoft (144 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)5236.11%
1.8 (1.8.9.3)1812.50%
1.8 (1.8.9.5)1711.81%
1.8 (1.8.9.1)1611.11%
1.8 (1.8.7.3)53.47%
1.8 (1.8.8.8)53.47%
1.8 (1.8.8.9)42.78%
1.8 (1.8.8.7)32.08%
1.8 (1.8.9.4)32.08%
1.8 (1.8.7.6)21.39%
1.8 (1.8.8.4)21.39%
1.8 (1.8.5.8)21.39%
1.8 (1.8.9.2)21.39%
1.8 (1.8.6.0)21.39%
1.8 (1.8.2.1)21.39%
Other96.25%

Post.Office (133 servers)

Version Number of Servers Percent
4.33123.31%
4.2.22418.05%
4.1.2.41410.53%
3.5.3129.02%
4.2.1.396.77%
4.496.77%
3.1.232.26%
3.5.3J32.26%
3.5.132.26%
4.2.1.132.26%
4.1.132.26%
3.9.2.332.26%
3.8.7.421.50%
3.9.221.50%
Other129.02%

GroupWise (76 servers)

Version Number of Servers Percent
14.2.21418.42%
18.0.1911.84%
14.2.179.21%
14.2.067.89%
6.5.756.58%
14.2.356.58%
14.0.145.26%
18.0.045.26%
7.0.333.95%
6.0.422.63%
6.0.222.63%
8.0.322.63%
6.5.211.32%
7.0.411.32%
14.0.211.32%
8.0.211.32%
14.0.011.32%
6.0.311.32%
18.0.211.32%
6.5.011.32%
7.0.111.32%
12.0.111.32%
6.5.511.32%
7.0.211.32%
6.5.611.32%
Other00.00%

Gordano Messaging Suite (GMS) (64 servers)

Version Number of Servers Percent
Other64100.00%

Trend Micro (55 servers)

Version Number of Servers Percent
5.71730.91%
5.181221.82%
5.5916.36%
7.0712.73%
7.559.09%
3.5323.64%
8.511.82%
811.82%
9.011.82%
Other00.00%

InterScan VirusWall (23 servers)

Version Number of Servers Percent
Other23100.00%

VisNetic (18 servers)

Version Number of Servers Percent
9.3.2.0738.89%
5.8.6.6211.11%
5.0.2.3211.11%
6.2.2.015.56%
5.5.8.315.56%
8.0.315.56%
9.1.4.015.56%
8.0.3.115.56%
5.0.2.015.56%
8.5.0.815.56%
Other00.00%

OpenVMS (12 servers)

Version Number of Servers Percent
7.3650.00%
8.4433.33%
8.318.33%
8.218.33%
Other00.00%

Mirapoint (8 servers)

Version Number of Servers Percent
4.4.2a-FCS225.00%
4.3.5-GA225.00%
4.4.3-GA225.00%
3.10.10a-GA112.50%
4.4.6-GA112.50%
Other00.00%

Mercury (7 servers)

Version Number of Servers Percent
3.32457.14%
1.48228.57%
3.21114.29%
Other00.00%

Interscan (6 servers)

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

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.3120.00%
3.0.7120.00%
3.1.0120.00%
3.1.5120.00%
3.1.2120.00%
Other00.00%

WebSTAR V (5 servers)

Version Number of Servers Percent
5.4.1480.00%
5.3.2120.00%
Other00.00%

MessageWall (3 servers)

Version Number of Servers Percent
1.0.83100.00%
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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