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Mail (MX) Server Survey
August 1st, 2018

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 Queried1,848,985   100.0%
Number of Servers that didn't respond321,70317.40%
    Server didn't open socket312,51916.90%
    Server didn't provide banner9,1840.50%
Server provided banner1,527,28282.60%
Server banner identifies software in use948,00351.27%

As indicated by the above table, of the 1,848,985 servers queried, only 948,003 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
Exim540,33357.00%
Postfix322,88534.06%
Sendmail40,1324.23%
MailEnable20,9002.20%
MDaemon9,3320.98%
Microsoft6,6300.70%
IMail1,7300.18%
CommuniGate Pro1,5080.16%
XMail9150.10%
Lotus Domino6950.07%
WinWebMail6900.07%
SurgeSMTP5330.06%
Qmail Toaster4300.05%
Kerio3380.04%
Merak2220.02%
MagicMail1610.02%
ArGoSoft1550.02%
Post.Office1320.01%
GroupWise770.01%
Gordano Messaging Suite (GMS)640.01%
Trend Micro540.01%
InterScan VirusWall230.00%
VisNetic160.00%
OpenVMS120.00%
Mirapoint80.00%
Mercury70.00%
Interscan60.00%
Neon Mail Server50.00%
WebSTAR V40.00%
MessageWall30.00%
WebSTAR20.00%
ModusMail10.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (540,333 servers)

Version Number of Servers Percent
4.91354,35265.58%
4.8977,76514.39%
4.8736,1306.69%
4.9014,9122.76%
4.8414,2932.65%
4.806,0521.12%
4.865,7161.06%
Other31,1135.76%

Postfix (322,885 servers)

Version Number of Servers Percent
Other322,885100.00%

Sendmail (40,132 servers)

Version Number of Servers Percent
8.15.211,38328.36%
8.14.48,68021.63%
8.13.85,44613.57%
8.13.13,4508.60%
8.14.53,3868.44%
8.14.72,1765.42%
8.14.91,6794.18%
8.14.31,0282.56%
Other2,9047.24%

MailEnable (20,900 servers)

Version Number of Servers Percent
9.00--2,40011.48%
9.16--2,10810.09%
10.12--1,4046.72%
8.60--7513.59%
8.53--7343.51%
6.5--5822.78%
8.51--5072.43%
10.16--3741.79%
8.60-8.60-3631.74%
8.04--3541.69%
1.986--3401.63%
9.75--3171.52%
10.14--2651.27%
10.15--2521.21%
8.50--2331.11%
9.00--9.002141.02%
Other9,70246.42%

MDaemon (9,332 servers)

Version Number of Servers Percent
18.0.27027.52%
13.5.15215.58%
13.6.34434.75%
16.5.24244.54%
13.0.43834.10%
11.0.33713.98%
13.0.53693.95%
11.0.03683.94%
18.0.13003.21%
17.5.22652.84%
17.5.32192.35%
12.5.42072.22%
12.5.62002.14%
16.0.41902.04%
14.5.21761.89%
18.0.01731.85%
15.0.31671.79%
10.0.01431.53%
10.1.21391.49%
16.5.11381.48%
17.5.11361.46%
17.0.21271.36%
16.0.11081.16%
13.0.21051.13%
10.1.0971.04%
Other2,86130.66%

Microsoft (6,630 servers)

Version Number of Servers Percent
6.0.3790.46753,53153.26%
7.5.7601.1751488913.41%
8.5.9600.1638472010.86%
6.0.3790.39594176.29%
8.0.9200.163841742.62%
10.0.14393.01512.28%
5.0.2195.53291462.20%
7.0.6002.182641171.76%
6.0.3790.18301061.60%
5.0.2195.6713721.09%
Other3074.63%

IMail (1,730 servers)

Version Number of Servers Percent
12.5.6.10127615.95%
8.2218010.40%
12.4.1.151579.08%
12.5.5.1151347.75%
9.231176.76%
12.5.3.93955.49%
12.3.0.100885.09%
12.5.4.146875.03%
8.15794.57%
8.05533.06%
11.03523.01%
11.5321.85%
12.5.5.117261.50%
7.07251.45%
7.15211.21%
10.02201.16%
10.01191.10%
Other26915.55%

CommuniGate Pro (1,508 servers)

Version Number of Servers Percent
6.1.16.563.71%
6.1.18382.52%
6.1.16372.45%
5.3.13.342.25%
6.1.11322.12%
6.0.11.322.12%
6.2.1301.99%
6.1.18.301.99%
6.2.5.301.99%
5.4.11291.92%
5.4.11.271.79%
6.1.19251.66%
6.0.11241.59%
6.2.4221.46%
6.1.19.211.39%
6.1.11.211.39%
5.2.20211.39%
5.2.20.211.39%
6.1.10201.33%
5.1.16191.26%
6.2.0191.26%
6.0.9191.26%
5.2.3181.19%
5.1.16.171.13%
6.2.3.171.13%
6.2.4.161.06%
6.0.9.161.06%
6.1.2.161.06%
6.2.2161.06%
Other78552.06%

XMail (915 servers)

Version Number of Servers Percent
1.2741445.25%
1.2229332.02%
1.25636.89%
1.26576.23%
1.24343.72%
1.21171.86%
1.23111.20%
Other262.84%

Lotus Domino (695 servers)

Version Number of Servers Percent
8.5.3FP613619.57%
8.5.310214.68%
8.5.2324.60%
7.0.2284.03%
8.5.1243.45%
8.5243.45%
8.5.3FP2192.73%
8.5.3FP3182.59%
8.5.2FP4152.16%
8.0.1142.01%
8.5.3FP1142.01%
8.5.2FP3142.01%
8.5.3FP4131.87%
7.0.3131.87%
8.5.2FP2121.73%
7.0111.58%
8.0111.58%
6.5101.44%
7.0.1101.44%
6.5.591.29%
6.5.191.29%
6.5.481.15%
8.5.3FP581.15%
8.5.1FP581.15%
8.0.281.15%
7.0.3FP171.01%
7.0.471.01%
Other11115.97%

WinWebMail (690 servers)

Version Number of Servers Percent
3.9.0.715021.74%
3.8.1.39013.04%
3.9.0.1517.39%
3.8.0.1415.94%
4.0.0.1355.07%
3.7.6.1334.78%
4.1.0.1314.49%
3.8.1.5294.20%
3.8.5.1202.90%
3.9.5.3182.61%
3.7.3.1172.46%
3.8.6.1162.32%
3.8.1.1162.32%
4.2.0.1162.32%
3.7.7.3152.17%
3.9.2.1142.03%
3.9.3.1131.88%
3.8.2.1121.74%
3.8.3.1111.59%
3.7.1.1101.45%
3.9.5.1101.45%
3.7.5.171.01%
Other355.07%

SurgeSMTP (533 servers)

Version Number of Servers Percent
7.3e2-218334.33%
7.1e-1427.88%
6.5a2-2336.19%
7.2i-1254.69%
6.7c-1234.32%
7.2a-1213.94%
7.3i2-2173.19%
7.0c2-2142.63%
7.2e-2142.63%
6.9c-1132.44%
3.9e-1122.25%
6.5a-1122.25%
7.3c3-3122.25%
5.2a-1101.88%
7.3h-691.69%
6.1c-181.50%
6.4a-181.50%
4.0u4-471.31%
7.3j-461.13%
Other6412.01%

Qmail Toaster (430 servers)

Version Number of Servers Percent
1.331473.02%
1.039321.63%
1.281.86%
1.03.571.63%
1.03.651.16%
Other30.70%

Kerio (338 servers)

Version Number of Servers Percent
6.7.36418.93%
6.7.04814.20%
6.5.23510.36%
6.6.23410.06%
6.7.2298.58%
6.6.1175.03%
6.5.0164.73%
6.4.1164.73%
6.7.1123.55%
6.3.1113.25%
6.4.092.66%
6.5.172.07%
6.3.061.78%
6.6.051.48%
6.1.341.18%
5.7.941.18%
Other216.21%

Merak (222 servers)

Version Number of Servers Percent
8.0.36830.63%
8.9.14218.92%
8.5.0156.76%
7.4.5114.95%
7.6.1114.95%
8.3.8104.50%
7.5.2104.50%
9.0.362.70%
7.6.462.70%
7.2.041.80%
7.4.241.80%
7.0.131.35%
6.0.831.35%
4.2.131.35%
7.6.031.35%
Other2310.36%

MagicMail (161 servers)

Version Number of Servers Percent
Other161100.00%

ArGoSoft (155 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)5736.77%
1.8 (1.8.9.5)2012.90%
1.8 (1.8.9.3)1912.26%
1.8 (1.8.9.1)1610.32%
1.8 (1.8.7.3)53.23%
1.8 (1.8.8.8)53.23%
1.8 (1.8.8.9)42.58%
1.8 (1.8.6.0)31.94%
1.8 (1.8.9.4)31.94%
1.8 (1.8.8.7)31.94%
1.8 (1.8.9.2)31.94%
1.8 (1.8.7.6)21.29%
1.8 (1.8.8.4)21.29%
1.8 (1.8.5.8)21.29%
1.8 (1.8.2.1)21.29%
Other95.81%

Post.Office (132 servers)

Version Number of Servers Percent
4.33123.48%
4.2.22518.94%
4.1.2.4139.85%
3.5.3129.09%
4.2.1.396.82%
4.486.06%
3.1.232.27%
3.5.3J32.27%
3.5.132.27%
4.2.1.132.27%
4.1.132.27%
3.9.2.332.27%
3.8.7.421.52%
3.9.221.52%
Other129.09%

GroupWise (77 servers)

Version Number of Servers Percent
14.2.21620.78%
18.0.1911.69%
14.2.079.09%
14.2.167.79%
18.0.056.49%
6.5.756.49%
14.2.356.49%
14.0.145.19%
7.0.345.19%
8.0.322.60%
6.0.222.60%
6.0.422.60%
6.0.311.30%
6.5.011.30%
6.5.511.30%
7.0.211.30%
12.0.111.30%
7.0.111.30%
6.5.211.30%
14.0.011.30%
14.0.211.30%
7.0.411.30%
Other00.00%

Gordano Messaging Suite (GMS) (64 servers)

Version Number of Servers Percent
Other64100.00%

Trend Micro (54 servers)

Version Number of Servers Percent
5.71833.33%
5.181120.37%
5.5814.81%
7.0712.96%
7.559.26%
3.5323.70%
8.511.85%
811.85%
9.011.85%
Other00.00%

InterScan VirusWall (23 servers)

Version Number of Servers Percent
Other23100.00%

VisNetic (16 servers)

Version Number of Servers Percent
9.3.2.0637.50%
5.5.8.3212.50%
6.2.2.016.25%
8.0.316.25%
5.8.6.616.25%
9.1.4.016.25%
5.0.2.316.25%
8.0.3.116.25%
5.0.2.016.25%
8.5.0.816.25%
Other00.00%

OpenVMS (12 servers)

Version Number of Servers Percent
7.3650.00%
8.4433.33%
8.318.33%
8.218.33%
Other00.00%

Mirapoint (8 servers)

Version Number of Servers Percent
4.4.2a-FCS225.00%
4.3.5-GA225.00%
4.4.3-GA225.00%
3.10.10a-GA112.50%
4.4.6-GA112.50%
Other00.00%

Mercury (7 servers)

Version Number of Servers Percent
3.32457.14%
1.48228.57%
3.21114.29%
Other00.00%

Interscan (6 servers)

Version Number of Servers Percent
3.81-Build_1022233.33%
3.81-Build_1084116.67%
3.8-Build_3013116.67%
3.8-Build_1080116.67%
3.5 (build 1294)116.67%
Other00.00%

Neon Mail Server (5 servers)

Version Number of Servers Percent
3.1.3120.00%
3.0.7120.00%
3.1.0120.00%
3.1.5120.00%
3.1.2120.00%
Other00.00%

WebSTAR V (4 servers)

Version Number of Servers Percent
5.4.14100.00%
Other00.00%

MessageWall (3 servers)

Version Number of Servers Percent
1.0.83100.00%
Other00.00%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

ModusMail (1 servers)

Version Number of Servers Percent
4.1.361.211100.00%
Other00.00%




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