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Mail (MX) Server Survey
April 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 Queried1,239,937   100.0%
Number of Servers that didn't respond207,95516.77%
    Server didn't open socket204,61716.50%
    Server didn't provide banner3,3380.27%
Server provided banner1,031,98283.23%
Server banner identifies software in use652,24752.60%

As indicated by the above table, of the 1,239,937 servers queried, only 652,247 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
Exim377,57557.89%
Postfix223,53034.27%
Sendmail25,2173.87%
MailEnable13,7292.10%
MDaemon4,7830.73%
Microsoft2,6740.41%
CommuniGate Pro9110.14%
IMail7800.12%
Qmail Toaster5600.09%
XMail5420.08%
SurgeSMTP3870.06%
OpenSMTPD2990.05%
Lotus Domino2670.04%
WinWebMail2590.04%
MagicMail1440.02%
Kerio1430.02%
Merak1180.02%
Post.Office890.01%
ArGoSoft730.01%
GroupWise580.01%
Gordano Messaging Suite (GMS)440.01%
Trend Micro280.00%
OpenVMS100.00%
VisNetic80.00%
InterScan VirusWall50.00%
Interscan30.00%
WebSTAR V30.00%
Mercury20.00%
ModusMail20.00%
Mirapoint20.00%
MessageWall10.00%
Neon Mail Server10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (377,575 servers)

Version Number of Servers Percent
4.92149,73239.66%
4.93134,01135.49%
4.9124,0026.36%
4.92.314,5653.86%
4.93.0.412,0633.19%
4.877,1391.89%
4.896,5281.73%
4.845,4931.45%
4.92.24,1711.10%
4.903,9171.04%
Other15,9544.23%

Postfix (223,530 servers)

Version Number of Servers Percent
Other223,530100.00%

Sendmail (25,217 servers)

Version Number of Servers Percent
8.15.210,86443.08%
8.14.44,41117.49%
8.14.72,1738.62%
8.13.82,1718.61%
8.14.51,7196.82%
8.13.11,2204.84%
8.14.97563.00%
8.14.34611.83%
Other1,4425.72%

MailEnable (13,729 servers)

Version Number of Servers Percent
10.25--3,91528.52%
10.27--1,73112.61%
9.00--6314.60%
10.12--2972.16%
10.29--2471.80%
9.16--2311.68%
8.60--2111.54%
10.29--10.291991.45%
10.29-10.29-1601.17%
9.00--9.001581.15%
10.20--1571.14%
8.53--1541.12%
Other5,63841.07%

MDaemon (4,783 servers)

Version Number of Servers Percent
19.5.453711.23%
13.5.13006.27%
13.6.33006.27%
13.0.42074.33%
19.5.32044.27%
13.0.51924.01%
11.0.31683.51%
11.0.01663.47%
16.5.21352.82%
19.0.31222.55%
19.5.11172.45%
12.5.61082.26%
12.5.4992.07%
14.5.2982.05%
10.1.2701.46%
10.0.0601.25%
16.0.4561.17%
15.0.3551.15%
18.5.3491.02%
Other1,74036.38%

Microsoft (2,674 servers)

Version Number of Servers Percent
6.0.3790.46751,13442.41%
8.5.9600.1638441415.48%
7.5.7601.1751430311.33%
10.0.14393.26081736.47%
6.0.3790.39591435.35%
5.0.2195.5329833.10%
8.0.9200.16384622.32%
5.0.2195.6713441.65%
10.0.17763.1431.61%
6.0.3790.1830421.57%
7.0.6002.18264401.50%
Other1937.22%

CommuniGate Pro (911 servers)

Version Number of Servers Percent
6.2.1410211.20%
6.2.15454.94%
6.2.12434.72%
6.1.20343.73%
6.1.16313.40%
6.0.11303.29%
5.4.11272.96%
6.2.13252.74%
5.2.20252.74%
5.3.13242.63%
6.1.18222.41%
5.1.16202.20%
6.0.9171.87%
6.2.10151.65%
6.2.7141.54%
6.2.9111.21%
6.1.10101.10%
6.1.12101.10%
6.1.11101.10%
6.1.2101.10%
Other38642.37%

IMail (780 servers)

Version Number of Servers Percent
12.5.7.5912215.64%
12.5.6.1019712.44%
12.4.1.15567.18%
9.23496.28%
8.22435.51%
12.5.3.93395.00%
12.5.8.41364.62%
12.5.5.115364.62%
12.3.0.100344.36%
8.15293.72%
8.05232.95%
11.03212.69%
12.5.4.146202.56%
10.02162.05%
12.5.6.105151.92%
12.5.7.58151.92%
12.5.5.117141.79%
11.5101.28%
7.1591.15%
10.0181.03%
Other8811.28%

Qmail Toaster (560 servers)

Version Number of Servers Percent
1.342976.61%
1.0311520.54%
1.03.581.43%
Other81.43%

XMail (542 servers)

Version Number of Servers Percent
1.2728051.66%
1.2217031.37%
1.26274.98%
1.25264.80%
1.24173.14%
Other224.06%

SurgeSMTP (387 servers)

Version Number of Servers Percent
7.3o4-411830.49%
7.3e2-23910.08%
7.4e-1369.30%
7.1e-1205.17%
6.5a2-2184.65%
7.3i2-2153.88%
6.7c-1123.10%
7.2i-1102.58%
7.2a-192.33%
3.9e-192.33%
7.4i-192.33%
6.5a-161.55%
6.9c-161.55%
7.0c2-261.55%
7.4g-151.29%
7.4a-141.03%
7.2e-241.03%
7.4h-841.03%
Other5714.73%

OpenSMTPD (299 servers)

Version Number of Servers Percent
Other299100.00%

Lotus Domino (267 servers)

Version Number of Servers Percent
8.5.3FP65319.85%
8.5.33613.48%
7.0.2145.24%
8.5.2134.87%
8.5.1114.12%
7.093.37%
8.583.00%
7.0.383.00%
8.5.2FP283.00%
8.5.3FP562.25%
8.0.162.25%
8.5.3FP462.25%
8.5.3FP362.25%
6.5.451.87%
8.5.3FP251.87%
8.5.3FP151.87%
8.5.2FP451.87%
8.5.2FP351.87%
6.5.341.50%
7.0.3FP141.50%
8.5.1FP431.12%
5.0.831.12%
8.5.1FP531.12%
6.5.531.12%
Other3814.23%

WinWebMail (259 servers)

Version Number of Servers Percent
4.2.0.16123.55%
3.9.0.74718.15%
3.8.1.32610.04%
3.7.6.1145.41%
3.9.0.1145.41%
3.8.1.5103.86%
3.8.0.193.47%
4.1.0.183.09%
4.0.0.183.09%
3.8.3.172.70%
3.9.2.172.70%
3.7.3.162.32%
3.8.5.162.32%
3.8.6.151.93%
3.8.1.151.93%
1.041.54%
3.9.5.341.54%
3.7.7.331.16%
3.7.0.331.16%
Other124.63%

MagicMail (144 servers)

Version Number of Servers Percent
Other144100.00%

Kerio (143 servers)

Version Number of Servers Percent
6.7.33121.68%
6.7.01812.59%
6.5.21510.49%
6.7.2149.79%
6.6.2128.39%
6.7.185.59%
6.4.174.90%
6.6.164.20%
6.5.064.20%
6.1.053.50%
6.3.032.10%
6.1.332.10%
6.4.032.10%
5.7.921.40%
6.5.121.40%
Other85.59%

Merak (118 servers)

Version Number of Servers Percent
8.0.32924.58%
8.9.12622.03%
7.6.197.63%
7.4.575.93%
8.5.065.08%
9.0.365.08%
8.3.854.24%
7.5.243.39%
7.6.432.54%
7.6.021.69%
7.0.121.69%
6.0.821.69%
Other1714.41%

Post.Office (89 servers)

Version Number of Servers Percent
4.32528.09%
4.2.21719.10%
4.41617.98%
4.1.2.488.99%
3.5.388.99%
3.9.222.25%
4.1.122.25%
4.1.2.111.12%
3.9.2.111.12%
4.0.111.12%
3.5.3J11.12%
4.2.1.111.12%
3.6.211.12%
3.9.1.311.12%
4.1.0.311.12%
4.111.12%
3.1.211.12%
4.211.12%
Other00.00%

ArGoSoft (73 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)2230.14%
1.8 (1.8.9.3)1317.81%
1.8 (1.8.9.5)1317.81%
1.8 (1.8.9.1)56.85%
1.8 (1.8.8.8)34.11%
1.8 (1.8.7.3)34.11%
1.8 (1.8.9.2)22.74%
1.8 (1.8.6.0)22.74%
1.8 (1.8.8.9)11.37%
1.8 (1.8.8.7)11.37%
1.8 (1.8.7.6)11.37%
1.8 (1.8.5.8)11.37%
1.8 (1.8.8.4)11.37%
1.8 (1.8.9.4)11.37%
1.8 (1.8.1.1)11.37%
1.8 (1.8.1.7)11.37%
1.8 (1.8.2.1)11.37%
1.8 (1.8.2.5)11.37%
Other00.00%

GroupWise (58 servers)

Version Number of Servers Percent
18.1.11017.24%
18.2.0712.07%
14.2.2610.34%
14.2.346.90%
14.2.146.90%
18.1.046.90%
14.2.035.17%
18.0.035.17%
18.0.235.17%
14.0.023.45%
14.0.123.45%
6.5.711.72%
6.5.011.72%
12.0.111.72%
8.0.311.72%
7.0.111.72%
6.5.611.72%
7.0.211.72%
7.0.411.72%
6.0.211.72%
8.0.211.72%
Other00.00%

Gordano Messaging Suite (GMS) (44 servers)

Version Number of Servers Percent
Other44100.00%

Trend Micro (28 servers)

Version Number of Servers Percent
5.18932.14%
5.7725.00%
7.5517.86%
7.0414.29%
5.513.57%
7.5ready13.57%
7.113.57%
Other00.00%

OpenVMS (10 servers)

Version Number of Servers Percent
8.4550.00%
7.3330.00%
8.2110.00%
8.3110.00%
Other00.00%

VisNetic (8 servers)

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

InterScan VirusWall (5 servers)

Version Number of Servers Percent
Other5100.00%

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%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.1266.67%
5.3.2133.33%
Other00.00%

Mercury (2 servers)

Version Number of Servers Percent
3.32150.00%
1.48150.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
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%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%




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