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Mail (MX) Server Survey
June 1st, 2020

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 Queried1,380,107   100.0%
Number of Servers that didn't respond243,94917.68%
    Server didn't open socket239,94717.39%
    Server didn't provide banner4,0020.29%
Server provided banner1,136,15882.32%
Server banner identifies software in use714,68851.78%

As indicated by the above table, of the 1,380,107 servers queried, only 714,688 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
Exim411,62157.59%
Postfix248,02034.70%
Sendmail26,8143.75%
MailEnable14,8102.07%
MDaemon5,1880.73%
Microsoft2,9920.42%
CommuniGate Pro9920.14%
IMail8960.13%
Qmail Toaster6010.08%
XMail5940.08%
SurgeSMTP4200.06%
OpenSMTPD3520.05%
WinWebMail3170.04%
Lotus Domino3050.04%
MagicMail1480.02%
Kerio1380.02%
Merak1260.02%
Post.Office970.01%
ArGoSoft830.01%
GroupWise620.01%
Gordano Messaging Suite (GMS)460.01%
Trend Micro270.00%
OpenVMS130.00%
VisNetic80.00%
InterScan VirusWall40.00%
Mercury30.00%
Interscan30.00%
ModusMail20.00%
WebSTAR V20.00%
Mirapoint20.00%
MessageWall10.00%
WebSTAR10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (411,621 servers)

Version Number of Servers Percent
4.93234,80657.04%
4.9279,07119.21%
4.9122,2165.40%
4.93.0.416,7874.08%
4.92.314,7093.57%
4.877,1931.75%
4.896,8401.66%
4.845,6891.38%
4.904,1911.02%
Other20,1194.89%

Postfix (248,020 servers)

Version Number of Servers Percent
Other248,020100.00%

Sendmail (26,814 servers)

Version Number of Servers Percent
8.15.211,58443.20%
8.14.44,68617.48%
8.14.72,4849.26%
8.13.82,2598.42%
8.14.51,8006.71%
8.13.11,2704.74%
8.14.97782.90%
8.14.34641.73%
Other1,4895.55%

MailEnable (14,810 servers)

Version Number of Servers Percent
10.25--3,72925.18%
10.27--2,48716.79%
9.00--6644.48%
10.29--4382.96%
10.12--2691.82%
9.16--2341.58%
10.29--10.292271.53%
8.60--2201.49%
10.29-10.29-2081.40%
9.00--9.001631.10%
8.53--1591.07%
Other6,01240.59%

MDaemon (5,188 servers)

Version Number of Servers Percent
19.5.582915.98%
13.5.13346.44%
13.6.33075.92%
13.0.42053.95%
13.0.52043.93%
11.0.01803.47%
11.0.31783.43%
19.5.41563.01%
16.5.21522.93%
12.5.61132.18%
12.5.41031.99%
14.5.21001.93%
19.5.3981.89%
19.0.3781.50%
10.1.2701.35%
10.0.0601.16%
15.0.3591.14%
16.0.4561.08%
Other1,90636.74%

Microsoft (2,992 servers)

Version Number of Servers Percent
6.0.3790.46751,22941.08%
8.5.9600.1638447515.88%
7.5.7601.1751433911.33%
10.0.14393.26082157.19%
6.0.3790.39591645.48%
10.0.17763.1953.18%
5.0.2195.5329913.04%
8.0.9200.16384712.37%
5.0.2195.6713471.57%
6.0.3790.1830421.40%
7.0.6002.18264411.37%
5.0.2195.7381311.04%
Other1525.08%

CommuniGate Pro (992 servers)

Version Number of Servers Percent
6.2.1411011.09%
6.2.15686.85%
6.2.12373.73%
6.0.11353.53%
5.4.11343.43%
6.1.20343.43%
6.1.16333.33%
5.3.13282.82%
5.2.20272.72%
6.1.18222.22%
5.1.16222.22%
6.2.13212.12%
6.0.9181.81%
6.2.7141.41%
5.2.3131.31%
6.2.9131.31%
6.1.12131.31%
6.1.11121.21%
4.2.10111.11%
6.1.9111.11%
6.2.10111.11%
6.1.2111.11%
5.3.15101.01%
Other38438.71%

IMail (896 servers)

Version Number of Servers Percent
12.5.7.5912814.29%
12.5.6.10111112.39%
12.5.8.41768.48%
12.4.1.15677.48%
9.23586.47%
8.22475.25%
12.5.3.93444.91%
12.5.5.115394.35%
8.15353.91%
12.3.0.100353.91%
8.05343.79%
11.03232.57%
12.5.4.146222.46%
10.02192.12%
12.5.6.105151.67%
12.5.7.58151.67%
12.5.5.117141.56%
7.07101.12%
11.591.00%
Other9510.60%

Qmail Toaster (601 servers)

Version Number of Servers Percent
1.345375.37%
1.0313322.13%
1.03.571.16%
Other81.33%

XMail (594 servers)

Version Number of Servers Percent
1.2730651.52%
1.2218631.31%
1.26315.22%
1.25284.71%
1.24183.03%
Other254.21%

SurgeSMTP (420 servers)

Version Number of Servers Percent
7.3o4-49422.38%
7.4e-15914.05%
7.3e2-2399.29%
7.1e-1235.48%
6.5a2-2215.00%
7.3i2-2204.76%
6.7c-1143.33%
7.2i-1122.86%
7.2a-1102.38%
3.9e-192.14%
7.4i-171.67%
6.5a-161.43%
7.0c2-251.19%
7.4g-151.19%
6.9c-151.19%
Other9121.67%

OpenSMTPD (352 servers)

Version Number of Servers Percent
Other352100.00%

WinWebMail (317 servers)

Version Number of Servers Percent
4.2.0.17623.97%
3.9.0.75717.98%
3.8.1.3309.46%
3.8.0.1195.99%
3.9.0.1175.36%
4.1.0.1113.47%
3.7.6.1113.47%
3.7.3.1103.15%
3.8.1.192.84%
4.0.0.192.84%
3.9.2.182.52%
3.8.1.572.21%
3.8.6.172.21%
3.7.7.361.89%
3.8.3.161.89%
3.8.5.151.58%
1.041.26%
3.9.3.141.26%
3.9.5.341.26%
Other175.36%

Lotus Domino (305 servers)

Version Number of Servers Percent
8.5.3FP65919.34%
8.5.34013.11%
7.0.2134.26%
8.5.1134.26%
8.5.2123.93%
8.5.2FP2113.61%
8.5103.28%
7.0103.28%
7.0.382.62%
8.5.2FP372.30%
8.5.3FP472.30%
8.5.3FP172.30%
8.0.172.30%
6.5.461.97%
8.5.3FP361.97%
8.5.3FP561.97%
8.5.2FP451.64%
8.5.3FP251.64%
8.5.1FP551.64%
8.0.241.31%
7.0.3FP141.31%
6.5.341.31%
Other5618.36%

MagicMail (148 servers)

Version Number of Servers Percent
Other148100.00%

Kerio (138 servers)

Version Number of Servers Percent
6.7.33525.36%
6.7.01813.04%
6.6.21611.59%
6.7.2128.70%
6.6.196.52%
6.5.296.52%
6.5.085.80%
6.7.185.80%
6.4.132.17%
6.3.032.17%
6.5.121.45%
6.1.021.45%
6.1.321.45%
5.7.621.45%
5.7.921.45%
6.3.121.45%
Other53.62%

Merak (126 servers)

Version Number of Servers Percent
8.9.13124.60%
8.0.32923.02%
7.6.197.14%
7.4.586.35%
8.5.075.56%
9.0.364.76%
8.3.853.97%
7.6.443.17%
7.5.243.17%
4.4.121.59%
6.0.821.59%
7.0.121.59%
7.6.021.59%
Other1511.90%

Post.Office (97 servers)

Version Number of Servers Percent
4.32525.77%
4.41818.56%
4.2.21717.53%
4.1.2.499.28%
3.5.377.22%
4.2.1.133.09%
3.9.222.06%
4.1.122.06%
4.0.122.06%
4.1.0.311.03%
3.1.2J11.03%
3.1.211.03%
4.111.03%
4.2.1.311.03%
3.5.3J11.03%
3.9.1.311.03%
3.6.211.03%
3.5.111.03%
3.9.2.111.03%
4.1.2.111.03%
4.211.03%
Other00.00%

ArGoSoft (83 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)2732.53%
1.8 (1.8.9.3)1315.66%
1.8 (1.8.9.5)1315.66%
1.8 (1.8.9.1)67.23%
1.8 (1.8.7.3)33.61%
1.8 (1.8.8.8)33.61%
1.8 (1.8.2.1)22.41%
1.8 (1.8.7.6)22.41%
1.8 (1.8.8.9)22.41%
1.8 (1.8.9.2)22.41%
1.8 (1.8.6.0)22.41%
1.8 (1.8.1.1)11.20%
1.8 (1.8.9.4)11.20%
1.8 (1.8.1.7)11.20%
1.8 (1.8.8.7)11.20%
1.8 (1.8.8.4)11.20%
1.8 (1.8.5.8)11.20%
1.8 (1.8.6.1)11.20%
1.8 (1.8.2.5)11.20%
Other00.00%

GroupWise (62 servers)

Version Number of Servers Percent
18.1.11016.13%
18.2.0812.90%
18.1.069.68%
14.2.158.06%
14.2.258.06%
14.2.358.06%
18.2.146.45%
18.0.234.84%
18.0.023.23%
14.0.023.23%
14.0.123.23%
14.2.023.23%
8.0.311.61%
6.5.711.61%
7.0.111.61%
6.5.611.61%
6.5.411.61%
7.0.211.61%
5.211.61%
6.0.211.61%
Other00.00%

Gordano Messaging Suite (GMS) (46 servers)

Version Number of Servers Percent
Other46100.00%

Trend Micro (27 servers)

Version Number of Servers Percent
5.7725.93%
5.18725.93%
7.5518.52%
5.5414.81%
7.027.41%
7.5ready13.70%
7.113.70%
Other00.00%

OpenVMS (13 servers)

Version Number of Servers Percent
8.4753.85%
7.3323.08%
8.3215.38%
8.217.69%
Other00.00%

VisNetic (8 servers)

Version Number of Servers Percent
9.3.2.0787.50%
8.0.3112.50%
Other00.00%

InterScan VirusWall (4 servers)

Version Number of Servers Percent
Other4100.00%

Mercury (3 servers)

Version Number of Servers Percent
1.48266.67%
3.32133.33%
Other00.00%

Interscan (3 servers)

Version Number of Servers Percent
3.8-Build_3013133.33%
3.8-Build_1080133.33%
3.81-Build_1022133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

WebSTAR V (2 servers)

Version Number of Servers Percent
5.4.12100.00%
Other00.00%

Mirapoint (2 servers)

Version Number of Servers Percent
4.4.5-GA150.00%
4.4.6-GA150.00%
Other00.00%

MessageWall (1 servers)

Version Number of Servers Percent
1.0.81100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%



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