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Mail (MX) Server Survey
February 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 Queried1,784,268   100.0%
Number of Servers that didn't respond311,31417.45%
    Server didn't open socket303,94117.03%
    Server didn't provide banner7,3730.41%
Server provided banner1,472,95482.55%
Server banner identifies software in use913,53951.20%

As indicated by the above table, of the 1,784,268 servers queried, only 913,539 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
Exim519,68156.89%
Postfix314,35934.41%
Sendmail38,0294.16%
MailEnable19,8742.18%
MDaemon8,3220.91%
Microsoft5,5980.61%
IMail1,5810.17%
CommuniGate Pro1,3430.15%
XMail8620.09%
Qmail Toaster6570.07%
Lotus Domino5920.06%
WinWebMail5720.06%
SurgeSMTP5270.06%
OpenSMTPD3540.04%
Kerio3040.03%
Merak1970.02%
MagicMail1630.02%
ArGoSoft1290.01%
Post.Office1280.01%
GroupWise750.01%
Gordano Messaging Suite (GMS)570.01%
Trend Micro540.01%
InterScan VirusWall200.00%
VisNetic160.00%
OpenVMS120.00%
Mirapoint90.00%
Mercury60.00%
Interscan50.00%
Neon Mail Server50.00%
WebSTAR V30.00%
WebSTAR20.00%
MessageWall20.00%
ModusMail10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (519,681 servers)

Version Number of Servers Percent
4.91405,79378.09%
4.8930,1645.80%
4.8726,3775.08%
4.8412,3572.38%
4.9010,8612.09%
Other34,1296.57%

Postfix (314,359 servers)

Version Number of Servers Percent
Other314,359100.00%

Sendmail (38,029 servers)

Version Number of Servers Percent
8.15.211,80331.04%
8.14.47,79320.49%
8.13.84,67812.30%
8.14.53,0818.10%
8.14.72,9467.75%
8.13.12,7637.27%
8.14.91,5924.19%
8.14.38692.29%
Other2,5046.58%

MailEnable (19,874 servers)

Version Number of Servers Percent
10.12--3,43417.28%
9.00--1,7648.88%
9.16--1,6458.28%
8.60--6023.03%
8.53--5122.58%
6.5--4422.22%
8.51--3711.87%
8.60-8.60-3241.63%
10.18--3071.54%
10.19--2851.43%
10.16--2811.41%
8.04--2791.40%
1.986--2541.28%
9.75--2361.19%
10.20--2181.10%
9.00--9.002041.03%
Other8,71643.86%

MDaemon (8,322 servers)

Version Number of Servers Percent
18.5.192011.06%
13.5.14845.82%
13.6.34165.00%
13.0.43474.17%
16.5.23374.05%
13.0.53263.92%
11.0.03183.82%
11.0.33143.77%
18.5.02853.42%
18.0.22833.40%
12.5.41862.24%
12.5.61782.14%
14.5.21561.87%
16.0.41461.75%
15.0.31371.65%
17.5.21241.49%
10.0.01241.49%
10.1.21231.48%
17.5.31181.42%
10.1.01031.24%
16.5.11011.21%
13.0.2891.07%
16.0.1881.06%
Other2,61931.47%

Microsoft (5,598 servers)

Version Number of Servers Percent
6.0.3790.46752,81450.27%
7.5.7601.1751472813.00%
8.5.9600.1638467312.02%
6.0.3790.39593185.68%
8.0.9200.163841582.82%
5.0.2195.53291332.38%
10.0.14393.26081302.32%
10.0.14393.01021.82%
7.0.6002.18264941.68%
6.0.3790.1830861.54%
5.0.2195.6713651.16%
Other2975.31%

IMail (1,581 servers)

Version Number of Servers Percent
12.5.6.10131920.18%
8.221559.80%
12.4.1.151479.30%
12.5.5.1151187.46%
9.23925.82%
12.5.4.146915.76%
12.5.3.93895.63%
12.3.0.100795.00%
8.15684.30%
11.03483.04%
8.05462.91%
12.5.5.117231.45%
11.5221.39%
7.07181.14%
10.02181.14%
10.01171.08%
7.15161.01%
Other21513.60%

CommuniGate Pro (1,343 servers)

Version Number of Servers Percent
6.2.10513.80%
6.1.16413.05%
5.4.11332.46%
6.1.18322.38%
6.2.7322.38%
6.2.9312.31%
6.0.11302.23%
5.1.16282.08%
6.1.11261.94%
5.2.20261.94%
5.3.13261.94%
6.0.11.241.79%
6.0.9211.56%
6.1.10211.56%
5.2.3201.49%
6.2.10.201.49%
6.1.2201.49%
6.2.4191.41%
6.1.16.181.34%
6.2.1181.34%
6.1.19171.27%
6.2.8161.19%
5.4.11.161.19%
6.1.20151.12%
6.1.18.141.04%
6.2141.04%
Other71453.16%

XMail (862 servers)

Version Number of Servers Percent
1.2741448.03%
1.2226831.09%
1.26556.38%
1.25546.26%
1.24303.48%
1.21101.16%
Other313.60%

Qmail Toaster (657 servers)

Version Number of Servers Percent
1.351878.84%
1.0311317.20%
1.03.5101.52%
1.281.22%
Other81.22%

Lotus Domino (592 servers)

Version Number of Servers Percent
8.5.3FP611819.93%
8.5.38614.53%
8.5.2305.07%
7.0.2284.73%
8.5.1223.72%
8.5213.55%
8.5.3FP2152.53%
8.5.3FP1152.53%
8.5.3FP3132.20%
7.0122.03%
7.0.3122.03%
8.5.3FP4122.03%
8.5.2FP2111.86%
8.5.2FP4111.86%
8.0111.86%
8.0.1101.69%
8.5.2FP3101.69%
7.0.491.52%
6.591.52%
8.5.1FP591.52%
6.5.581.35%
8.5.3FP581.35%
7.0.171.18%
6.5.461.01%
8.5.2FP4HF75961.01%
Other9315.71%

WinWebMail (572 servers)

Version Number of Servers Percent
3.9.0.710618.53%
3.8.1.36711.71%
4.2.0.15810.14%
3.9.0.1406.99%
3.7.6.1295.07%
3.8.0.1274.72%
4.1.0.1264.55%
3.8.1.5234.02%
4.0.0.1193.32%
3.8.5.1172.97%
3.8.6.1152.62%
3.8.1.1152.62%
3.7.3.1142.45%
3.9.2.1142.45%
3.9.3.1132.27%
3.9.5.3122.10%
3.8.3.1122.10%
3.7.7.3111.92%
3.8.2.191.57%
3.7.1.161.05%
3.9.5.161.05%
Other335.77%

SurgeSMTP (527 servers)

Version Number of Servers Percent
7.3e2-29117.27%
7.3i2-28015.18%
7.3o4-45710.82%
7.1e-1387.21%
6.5a2-2305.69%
7.2a-1203.80%
6.7c-1203.80%
7.2i-1183.42%
7.3o2-2152.85%
6.9c-1142.66%
7.0c2-2132.47%
3.9e-1112.09%
7.2e-2101.90%
6.5a-191.71%
6.1c-181.52%
5.2a-181.52%
6.4a-171.33%
4.0u4-471.33%
Other7113.47%

OpenSMTPD (354 servers)

Version Number of Servers Percent
Other354100.00%

Kerio (304 servers)

Version Number of Servers Percent
6.7.36320.72%
6.7.04213.82%
6.6.2309.87%
6.7.2289.21%
6.5.2289.21%
6.5.0165.26%
6.6.1144.61%
6.4.1134.28%
6.7.1103.29%
6.3.1103.29%
6.4.082.63%
6.5.161.97%
6.3.051.64%
6.6.051.64%
6.1.341.32%
Other227.24%

Merak (197 servers)

Version Number of Servers Percent
8.0.35125.89%
8.9.14020.30%
8.5.0136.60%
7.4.5115.58%
7.6.1115.58%
7.5.294.57%
8.3.884.06%
7.6.484.06%
9.0.373.55%
7.4.242.03%
7.2.042.03%
7.6.031.52%
7.0.131.52%
6.0.831.52%
4.4.121.02%
Other2010.15%

MagicMail (163 servers)

Version Number of Servers Percent
Other163100.00%

ArGoSoft (129 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)4736.43%
1.8 (1.8.9.3)1914.73%
1.8 (1.8.9.5)1813.95%
1.8 (1.8.9.1)1310.08%
1.8 (1.8.8.8)53.88%
1.8 (1.8.7.3)32.33%
1.8 (1.8.7.6)21.55%
1.8 (1.8.8.4)21.55%
1.8 (1.8.8.9)21.55%
1.8 (1.8.8.7)21.55%
1.8 (1.8.5.8)21.55%
1.8 (1.8.9.2)21.55%
1.8 (1.8.6.0)21.55%
1.8 (1.8.9.4)21.55%
1.8 (1.8.2.1)21.55%
Other64.65%

Post.Office (128 servers)

Version Number of Servers Percent
4.33325.78%
4.2.22317.97%
4.1.2.41410.94%
4.4118.59%
3.5.3107.81%
4.2.1.375.47%
4.1.132.34%
4.2.1.132.34%
3.5.3J32.34%
3.5.132.34%
3.9.221.56%
4.0.121.56%
3.8.7.421.56%
3.9.2.321.56%
Other107.81%

GroupWise (75 servers)

Version Number of Servers Percent
14.2.21418.67%
18.0.2912.00%
14.2.3810.67%
18.1.0810.67%
14.2.168.00%
14.2.056.67%
6.5.745.33%
7.0.334.00%
14.0.134.00%
18.0.122.67%
8.0.322.67%
6.0.422.67%
7.0.411.33%
6.5.011.33%
6.5.511.33%
12.0.111.33%
7.0.111.33%
6.5.611.33%
6.5.211.33%
7.0.211.33%
6.0.211.33%
Other00.00%

Gordano Messaging Suite (GMS) (57 servers)

Version Number of Servers Percent
Other57100.00%

Trend Micro (54 servers)

Version Number of Servers Percent
5.71629.63%
5.181222.22%
5.5814.81%
7.0712.96%
7.559.26%
3.5323.70%
8.511.85%
811.85%
9.011.85%
7.111.85%
Other00.00%

InterScan VirusWall (20 servers)

Version Number of Servers Percent
Other20100.00%

VisNetic (16 servers)

Version Number of Servers Percent
9.3.2.0850.00%
5.5.8.3212.50%
8.0.316.25%
5.8.6.616.25%
5.0.2.316.25%
9.1.4.016.25%
5.0.2.016.25%
6.2.2.016.25%
Other00.00%

OpenVMS (12 servers)

Version Number of Servers Percent
8.4541.67%
7.3541.67%
8.318.33%
8.218.33%
Other00.00%

Mirapoint (9 servers)

Version Number of Servers Percent
4.4.2a-FCS222.22%
4.4.3-GA222.22%
4.3.6-GA111.11%
3.10.10a-GA111.11%
4.3.5-GA111.11%
4.4.5-GA111.11%
4.4.6-GA111.11%
Other00.00%

Mercury (6 servers)

Version Number of Servers Percent
3.32350.00%
1.48350.00%
Other00.00%

Interscan (5 servers)

Version Number of Servers Percent
3.81-Build_1022240.00%
3.81-Build_1084120.00%
3.8-Build_3013120.00%
3.8-Build_1080120.00%
Other00.00%

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.3120.00%
3.0.7120.00%
3.1.2120.00%
3.1.0120.00%
3.0.8120.00%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.13100.00%
Other00.00%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

ModusMail (1 servers)

Version Number of Servers Percent
4.1.361.211100.00%
Other00.00%




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