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Mail (MX) Server Survey
November 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 Queried1,730,839   100.0%
Number of Servers that didn't respond317,08718.32%
    Server didn't open socket309,92517.91%
    Server didn't provide banner7,1620.41%
Server provided banner1,413,75281.68%
Server banner identifies software in use877,47350.70%

As indicated by the above table, of the 1,730,839 servers queried, only 877,473 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
Exim499,35256.91%
Postfix306,75034.96%
Sendmail34,4153.92%
MailEnable18,7912.14%
MDaemon7,2740.83%
Microsoft4,5210.52%
IMail1,2790.15%
CommuniGate Pro1,2510.14%
XMail7830.09%
Qmail Toaster6370.07%
SurgeSMTP4910.06%
Lotus Domino4820.05%
WinWebMail4510.05%
Kerio2410.03%
MagicMail1620.02%
Merak1510.02%
Post.Office1300.01%
ArGoSoft1040.01%
GroupWise640.01%
Gordano Messaging Suite (GMS)530.01%
Trend Micro430.00%
InterScan VirusWall110.00%
VisNetic100.00%
OpenVMS90.00%
Mercury40.00%
Interscan40.00%
WebSTAR V30.00%
ModusMail20.00%
MessageWall20.00%
WebSTAR10.00%
Neon Mail Server10.00%
Mirapoint10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (499,352 servers)

Version Number of Servers Percent
4.92366,87573.47%
4.9144,6468.94%
4.92.213,7762.76%
4.92.313,2322.65%
4.8712,2462.45%
4.899,8221.97%
4.847,8851.58%
4.905,3761.08%
Other25,4945.11%

Postfix (306,750 servers)

Version Number of Servers Percent
Other306,750100.00%

Sendmail (34,415 servers)

Version Number of Servers Percent
8.15.212,49036.29%
8.14.46,54219.01%
8.13.83,4179.93%
8.14.72,9368.53%
8.14.52,6417.67%
8.13.12,2146.43%
8.14.91,3844.02%
8.14.36841.99%
Other2,1076.12%

MailEnable (18,791 servers)

Version Number of Servers Percent
10.25--6,47734.47%
9.00--1,1085.90%
10.12--5993.19%
9.16--5012.67%
8.60--3591.91%
8.53--2901.54%
10.20--2771.47%
6.5--2691.43%
10.26--2691.43%
8.60-8.60-2601.38%
10.25--10.252331.24%
8.51--2291.22%
10.25-10.25-2231.19%
9.00--9.001941.03%
Other7,50339.93%

MDaemon (7,274 servers)

Version Number of Servers Percent
19.0.395413.12%
13.5.14696.45%
13.6.33965.44%
13.0.43054.19%
13.0.52843.90%
11.0.32733.75%
11.0.02663.66%
16.5.22273.12%
12.5.61612.21%
12.5.41552.13%
14.5.21502.06%
18.5.31281.76%
19.0.21251.72%
18.5.11101.51%
19.0.11081.48%
18.5.21061.46%
10.0.0991.36%
10.1.2941.29%
15.0.3941.29%
16.0.4911.25%
18.0.2771.06%
10.1.0761.04%
Other2,52634.73%

Microsoft (4,521 servers)

Version Number of Servers Percent
6.0.3790.46752,03845.08%
8.5.9600.1638461813.67%
7.5.7601.1751456012.39%
6.0.3790.39592615.77%
10.0.14393.26082485.49%
8.0.9200.163841332.94%
5.0.2195.53291302.88%
6.0.3790.1830781.73%
7.0.6002.18264721.59%
5.0.2195.6713561.24%
Other3277.23%

IMail (1,279 servers)

Version Number of Servers Percent
12.5.6.10118614.54%
12.5.7.5915111.81%
12.4.1.151249.70%
12.5.5.115796.18%
12.5.3.93776.02%
9.23776.02%
8.22624.85%
12.3.0.100614.77%
8.15503.91%
12.5.4.146423.28%
8.05403.13%
11.03322.50%
12.5.7.58312.42%
10.02221.72%
12.5.6.105201.56%
12.5.5.117181.41%
11.5181.41%
10.01141.09%
7.15141.09%
Other16112.59%

CommuniGate Pro (1,251 servers)

Version Number of Servers Percent
6.2.12524.16%
6.2.14493.92%
6.1.16352.80%
6.2.12.322.56%
6.2.13312.48%
6.0.11282.24%
6.1.20272.16%
5.4.11262.08%
5.1.16241.92%
6.2.10241.92%
6.2.14.231.84%
5.3.13221.76%
6.1.18221.76%
5.2.20211.68%
6.0.9211.68%
6.0.11.181.44%
6.1.11171.36%
6.1.16.161.28%
5.2.20.161.28%
5.4.11.151.20%
6.1.10151.20%
6.2.9151.20%
6.1.2141.12%
6.1.12141.12%
5.2.3141.12%
5.3.13.131.04%
Other64751.72%

XMail (783 servers)

Version Number of Servers Percent
1.2738649.30%
1.2224831.67%
1.25445.62%
1.26445.62%
1.24273.45%
Other344.34%

Qmail Toaster (637 servers)

Version Number of Servers Percent
1.347674.73%
1.0314422.61%
1.03.581.26%
Other91.41%

SurgeSMTP (491 servers)

Version Number of Servers Percent
7.3o4-416232.99%
7.3e2-26112.42%
7.1e-1275.50%
7.3i2-2265.30%
6.5a2-2224.48%
6.7c-1183.67%
7.2i-1163.26%
7.2a-1163.26%
7.0c2-2153.05%
6.9c-1102.04%
3.9e-191.83%
7.4a-191.83%
4.0u4-471.43%
7.2e-271.43%
5.2a-151.02%
6.5a-151.02%
6.1c-151.02%
Other7114.46%

Lotus Domino (482 servers)

Version Number of Servers Percent
8.5.3FP610421.58%
8.5.36613.69%
8.5.2224.56%
8.5204.15%
7.0.2173.53%
8.5.1163.32%
8.5.3FP2132.70%
8.5.3FP1122.49%
7.0122.49%
8.5.3FP3112.28%
8.5.2FP2112.28%
8.5.3FP4102.07%
8.5.2FP491.87%
7.0.391.87%
8.5.2FP391.87%
8.0.191.87%
8.5.3FP561.24%
8.5.2FP4HF75961.24%
8.061.24%
8.5.1FP561.24%
6.551.04%
6.5.551.04%
8.0.251.04%
8.5.1FP451.04%
6.5.351.04%
7.0.3FP151.04%
7.0.151.04%
Other7315.15%

WinWebMail (451 servers)

Version Number of Servers Percent
4.2.0.17917.52%
3.9.0.77516.63%
3.8.1.3459.98%
3.9.0.1357.76%
3.8.0.1235.10%
3.7.6.1173.77%
4.0.0.1173.77%
4.1.0.1153.33%
3.8.1.5143.10%
3.8.2.1122.66%
3.9.2.1112.44%
3.7.3.1112.44%
3.8.5.1112.44%
3.8.1.1112.44%
3.7.7.3102.22%
3.8.3.192.00%
3.9.3.181.77%
3.8.6.171.55%
3.9.5.361.33%
3.7.1.151.11%
Other306.65%

Kerio (241 servers)

Version Number of Servers Percent
6.7.35824.07%
6.7.03012.45%
6.7.2239.54%
6.5.2229.13%
6.6.2197.88%
6.5.0114.56%
6.6.1114.56%
6.4.1104.15%
6.7.193.73%
6.3.172.90%
6.4.062.49%
6.6.052.07%
6.5.152.07%
6.1.041.66%
6.1.331.24%
6.3.031.24%
5.7.931.24%
Other124.98%

MagicMail (162 servers)

Version Number of Servers Percent
Other162100.00%

Merak (151 servers)

Version Number of Servers Percent
8.0.33623.84%
8.9.13321.85%
8.5.0106.62%
7.6.1106.62%
7.4.595.96%
8.3.874.64%
9.0.363.97%
7.6.442.65%
7.5.242.65%
6.0.831.99%
7.0.131.99%
7.6.031.99%
4.4.121.32%
7.4.221.32%
Other1912.58%

Post.Office (130 servers)

Version Number of Servers Percent
4.33325.38%
4.2.22519.23%
4.41813.85%
4.1.2.41310.00%
3.5.386.15%
4.2.1.353.85%
3.5.3J43.08%
3.5.132.31%
4.2.1.132.31%
4.0.121.54%
4.1.121.54%
3.9.221.54%
3.8.7.421.54%
Other107.69%

ArGoSoft (104 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)3735.58%
1.8 (1.8.9.3)1514.42%
1.8 (1.8.9.5)1514.42%
1.8 (1.8.9.1)65.77%
1.8 (1.8.8.8)32.88%
1.8 (1.8.7.6)32.88%
1.8 (1.8.6.0)32.88%
1.8 (1.8.2.1)21.92%
1.8 (1.8.9.2)21.92%
1.8 (1.8.5.8)21.92%
1.8 (1.8.8.4)21.92%
1.8 (1.8.8.7)21.92%
1.8 (1.8.8.9)21.92%
1.8 (1.8.7.3)21.92%
Other87.69%

GroupWise (64 servers)

Version Number of Servers Percent
18.1.11218.75%
14.2.2812.50%
18.1.0710.94%
14.2.369.38%
14.2.157.81%
18.0.257.81%
6.5.734.69%
14.2.034.69%
14.0.123.12%
8.0.323.12%
6.5.211.56%
6.0.211.56%
7.0.211.56%
14.0.011.56%
6.5.511.56%
6.5.611.56%
18.0.111.56%
7.0.111.56%
12.0.111.56%
6.5.011.56%
6.0.411.56%
Other00.00%

Gordano Messaging Suite (GMS) (53 servers)

Version Number of Servers Percent
Other53100.00%

Trend Micro (43 servers)

Version Number of Servers Percent
5.71330.23%
5.181125.58%
5.5511.63%
7.0511.63%
7.549.30%
7.124.65%
7.5ready12.33%
812.33%
9.012.33%
Other00.00%

InterScan VirusWall (11 servers)

Version Number of Servers Percent
Other11100.00%

VisNetic (10 servers)

Version Number of Servers Percent
9.3.2.0770.00%
8.0.3110.00%
9.1.4.0110.00%
5.5.8.3110.00%
Other00.00%

OpenVMS (9 servers)

Version Number of Servers Percent
7.3444.44%
8.4333.33%
8.3111.11%
8.2111.11%
Other00.00%

Mercury (4 servers)

Version Number of Servers Percent
3.32375.00%
1.48125.00%
Other00.00%

Interscan (4 servers)

Version Number of Servers Percent
3.81-Build_1022250.00%
3.8-Build_3013125.00%
3.8-Build_1080125.00%
Other00.00%

WebSTAR V (3 servers)

Version Number of Servers Percent
5.4.13100.00%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%

WebSTAR (1 servers)

Version Number of Servers Percent
Other1100.00%

Neon Mail Server (1 servers)

Version Number of Servers Percent
3.1.21100.00%
Other00.00%

Mirapoint (1 servers)

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




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