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Mail (MX) Server Survey
July 1st, 2021

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 Queried839,102   100.0%
Number of Servers that didn't respond125,92115.01%
    Server didn't open socket123,68814.74%
    Server didn't provide banner2,2330.27%
Server provided banner713,18184.99%
Server banner identifies software in use475,96456.72%

As indicated by the above table, of the 839,102 servers queried, only 475,964 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
Exim293,10461.58%
Postfix150,05631.53%
Sendmail16,8693.54%
MailEnable9,5612.01%
MDaemon2,3370.49%
Microsoft1,2120.25%
CommuniGate Pro5530.12%
IMail4340.09%
Qmail Toaster4150.09%
XMail3420.07%
OpenSMTPD2340.05%
SurgeSMTP2310.05%
Lotus Domino1260.03%
MagicMail1020.02%
WinWebMail830.02%
Kerio700.01%
Merak690.01%
Post.Office520.01%
ArGoSoft360.01%
GroupWise330.01%
Gordano Messaging Suite (GMS)150.00%
Trend Micro90.00%
OpenVMS60.00%
VisNetic40.00%
InterScan VirusWall30.00%
ModusMail20.00%
Interscan10.00%
Mercury10.00%
WebSTAR V10.00%
Neon Mail Server10.00%
WebSTAR10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (293,104 servers)

Version Number of Servers Percent
4.94.2200,81568.51%
4.9342,42114.47%
4.9412,6244.31%
4.926,2972.15%
4.914,7571.62%
4.92.34,2071.44%
4.893,4881.19%
Other18,4956.31%

Postfix (150,056 servers)

Version Number of Servers Percent
Other150,056100.00%

Sendmail (16,869 servers)

Version Number of Servers Percent
8.15.29,13254.13%
8.14.42,14412.71%
8.14.71,6559.81%
8.13.81,0286.09%
8.14.59895.86%
8.14.94022.38%
8.16.13792.25%
8.13.12931.74%
8.14.31841.09%
Other6633.93%

MailEnable (9,561 servers)

Version Number of Servers Percent
10.27--3,56237.26%
10.25--1,14011.92%
9.00--2943.07%
10.31--2662.78%
10.29--1571.64%
10.31-10.31-1421.49%
10.34--1361.42%
10.30--1361.42%
9.16--1071.12%
9.00--9.001071.12%
10.31--10.31971.01%
Other3,41735.74%

MDaemon (2,337 servers)

Version Number of Servers Percent
21.0.22229.50%
13.5.11697.23%
21.0.11416.03%
19.5.51054.49%
13.0.5974.15%
11.0.3903.85%
13.0.4893.81%
11.0.0783.34%
20.0.4642.74%
16.5.2632.70%
12.5.6612.61%
14.5.2522.23%
20.0.3492.10%
19.5.4441.88%
21.0.0391.67%
13.6.3291.24%
12.5.4291.24%
10.1.2281.20%
15.0.3251.07%
Other86336.93%

Microsoft (1,212 servers)

Version Number of Servers Percent
6.0.3790.467542935.40%
8.5.9600.1638419916.42%
7.5.7601.175141098.99%
10.0.14393.4169947.76%
6.0.3790.3959695.69%
5.0.2195.5329584.79%
10.0.17763.1697544.46%
10.0.14393.2608322.64%
8.0.9200.16384272.23%
5.0.2195.6713231.90%
6.0.3790.1830161.32%
10.0.17763.1151.24%
Other877.18%

CommuniGate Pro (553 servers)

Version Number of Servers Percent
6.2.158214.83%
6.2.14529.40%
6.1.20213.80%
6.0.11203.62%
6.2.12183.25%
6.1.18152.71%
6.1.16142.53%
5.4.11132.35%
6.0.9132.35%
6.3.6132.35%
6.3.5122.17%
5.2.20122.17%
6.0.791.63%
6.3.391.63%
6.2.1091.63%
6.2.1381.45%
5.1.1681.45%
6.3.481.45%
4.2.1071.27%
6.1.1261.08%
6.1.1761.08%
6.2.761.08%
Other19234.72%

IMail (434 servers)

Version Number of Servers Percent
12.5.8.417817.97%
12.5.6.1014911.29%
12.5.7.594710.83%
12.4.1.15398.99%
9.23235.30%
8.22225.07%
8.05204.61%
12.5.3.93194.38%
12.5.6.105173.92%
8.15173.92%
12.3.0.100163.69%
12.5.5.115133.00%
12.5.4.14692.07%
10.0292.07%
12.5.5.11781.84%
7.1551.15%
11.551.15%
Other388.76%

Qmail Toaster (415 servers)

Version Number of Servers Percent
1.332077.11%
1.038320.00%
1.03.561.45%
Other61.45%

XMail (342 servers)

Version Number of Servers Percent
1.2717049.71%
1.2211934.80%
1.26174.97%
1.25174.97%
1.2472.05%
1.1541.17%
Other82.34%

OpenSMTPD (234 servers)

Version Number of Servers Percent
Other234100.00%

SurgeSMTP (231 servers)

Version Number of Servers Percent
7.3o4-43314.29%
7.5c-12912.55%
7.5a-1239.96%
7.4o-1198.23%
7.3e2-2156.49%
7.1e-1146.06%
7.4e-1104.33%
7.3i2-273.03%
6.5a2-273.03%
6.7c-162.60%
7.5b-2241.73%
6.9c-141.73%
7.2a-141.73%
7.5d-241.73%
7.2i-131.30%
3.9e-131.30%
7.5d-731.30%
Other4318.61%

Lotus Domino (126 servers)

Version Number of Servers Percent
8.5.33225.40%
8.5.3FP62015.87%
7.064.76%
8.5.264.76%
7.0.343.17%
8.5.143.17%
8.5.1FP532.38%
8.5.3FP132.38%
8.5.2FP232.38%
7.0.232.38%
8.5.2FP332.38%
6.521.59%
8.5.3FP521.59%
8.5.2FP121.59%
5.0.1321.59%
8.521.59%
8.5.1FP421.59%
6.5.421.59%
8.5.2FP421.59%
5.0.821.59%
7.0.3FP121.59%
8.0.121.59%
7.5.121.59%
6.5.321.59%
Other1310.32%

MagicMail (102 servers)

Version Number of Servers Percent
Other102100.00%

WinWebMail (83 servers)

Version Number of Servers Percent
4.2.0.11922.89%
3.9.0.71518.07%
4.3.0.11012.05%
3.8.1.378.43%
3.8.6.144.82%
3.7.6.133.61%
4.0.0.133.61%
3.9.0.133.61%
3.8.1.133.61%
1.022.41%
4.1.0.122.41%
3.8.0.122.41%
3.7.3.122.41%
3.7.5.122.41%
3.9.1.111.20%
3.7.6.211.20%
3.9.5.311.20%
3.8.5.111.20%
3.9.2.211.20%
3.8.1.611.20%
Other00.00%

Kerio (70 servers)

Version Number of Servers Percent
6.7.31724.29%
6.6.1912.86%
6.6.2811.43%
6.7.0811.43%
6.7.268.57%
6.5.257.14%
6.5.045.71%
6.7.134.29%
5.7.922.86%
6.5.122.86%
6.0.1011.43%
6.3.111.43%
6.0.811.43%
6.6.011.43%
6.4.111.43%
6.1.011.43%
Other00.00%

Merak (69 servers)

Version Number of Servers Percent
8.0.31826.09%
8.9.11623.19%
7.6.1811.59%
7.4.557.25%
8.3.845.80%
9.0.345.80%
8.5.034.35%
7.6.022.90%
6.0.822.90%
8.0.111.45%
8.9.211.45%
8.3.611.45%
8.9.711.45%
7.4.411.45%
7.0.111.45%
8.9.011.45%
Other00.00%

Post.Office (52 servers)

Version Number of Servers Percent
4.41325.00%
4.31223.08%
4.2.21121.15%
4.1.2.447.69%
3.5.335.77%
3.9.223.85%
4.1.111.92%
3.5.3J11.92%
4.2.1.111.92%
4.1.0.311.92%
4.111.92%
3.1.211.92%
3.1.2J11.92%
Other00.00%

ArGoSoft (36 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)719.44%
1.8 (1.8.9.5)616.67%
1.8 (1.8.9.3)411.11%
1.8 (1.8.9.1)38.33%
1.8 (1.8.8.8)25.56%
1.8 (1.8.8.7)25.56%
1.8 (1.8.9.2)25.56%
1.8 (1.8.6.1)12.78%
1.8 (1.8.7.3)12.78%
1.8 (1.8.8.9)12.78%
1.8 (1.8.5.8)12.78%
1.8 (1.8.1.7)12.78%
1.8 (1.8.8.4)12.78%
1.8 (1.8.6.0)12.78%
1.8 (1.8.9.4)12.78%
1.8 (1.8.2.1)12.78%
1.8 (1.8.2.5)12.78%
Other00.00%

GroupWise (33 servers)

Version Number of Servers Percent
18.1.1515.15%
18.2.0412.12%
18.2.1412.12%
18.1.0412.12%
18.3.139.09%
14.0.026.06%
14.2.126.06%
14.2.226.06%
6.5.713.03%
18.0.013.03%
14.2.313.03%
6.5.013.03%
8.0.313.03%
14.2.013.03%
18.0.213.03%
Other00.00%

Gordano Messaging Suite (GMS) (15 servers)

Version Number of Servers Percent
Other15100.00%

Trend Micro (9 servers)

Version Number of Servers Percent
5.18555.56%
5.7333.33%
7.5ready111.11%
Other00.00%

OpenVMS (6 servers)

Version Number of Servers Percent
8.4350.00%
7.3233.33%
8.2116.67%
Other00.00%

VisNetic (4 servers)

Version Number of Servers Percent
9.3.2.0250.00%
8.0.3125.00%
5.0.1125.00%
Other00.00%

InterScan VirusWall (3 servers)

Version Number of Servers Percent
Other3100.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

Interscan (1 servers)

Version Number of Servers Percent
3.8-Build_30131100.00%
Other00.00%

Mercury (1 servers)

Version Number of Servers Percent
1.481100.00%
Other00.00%

WebSTAR V (1 servers)

Version Number of Servers Percent
5.4.11100.00%
Other00.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Mirapoint (1 servers)

Version Number of Servers Percent
4.4.5-GA1100.00%
Other00.00%



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