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Mail (MX) Server Survey
October 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 Queried1,831,505   100.0%
Number of Servers that didn't respond323,97117.69%
    Server didn't open socket317,84017.35%
    Server didn't provide banner6,1310.33%
Server provided banner1,507,53482.31%
Server banner identifies software in use932,69150.92%

As indicated by the above table, of the 1,831,505 servers queried, only 932,691 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
Exim529,52156.77%
Postfix319,97634.31%
Sendmail39,7184.26%
MailEnable20,5212.20%
MDaemon8,8920.95%
Microsoft6,2450.67%
IMail1,6910.18%
CommuniGate Pro1,4290.15%
XMail8930.10%
Lotus Domino6540.07%
Qmail Toaster6360.07%
WinWebMail6240.07%
SurgeSMTP5730.06%
Kerio3200.03%
Merak2110.02%
MagicMail1840.02%
Post.Office1410.02%
ArGoSoft1410.02%
Gordano Messaging Suite (GMS)870.01%
GroupWise870.01%
Trend Micro550.01%
InterScan VirusWall220.00%
OpenVMS170.00%
VisNetic170.00%
Mirapoint110.00%
Interscan60.00%
Mercury60.00%
WebSTAR V40.00%
Neon Mail Server30.00%
ModusMail20.00%
WebSTAR20.00%
MessageWall20.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (529,521 servers)

Version Number of Servers Percent
4.91395,40574.67%
4.8934,7636.56%
4.8732,3846.12%
4.9014,6782.77%
4.8413,6322.57%
4.805,7151.08%
4.865,3041.00%
Other27,6405.22%

Postfix (319,976 servers)

Version Number of Servers Percent
Other319,976100.00%

Sendmail (39,718 servers)

Version Number of Servers Percent
8.15.211,57829.15%
8.14.48,32020.95%
8.13.85,26413.25%
8.13.13,3058.32%
8.14.53,2798.26%
8.14.72,5996.54%
8.14.91,6444.14%
8.14.39782.46%
Other2,7516.93%

MailEnable (20,521 servers)

Version Number of Servers Percent
9.00--2,18610.65%
10.12--2,14910.47%
9.16--1,9179.34%
8.53--6793.31%
8.60--6743.28%
6.5--5092.48%
8.51--4732.30%
10.16--3571.74%
8.60-8.60-3361.64%
8.04--3261.59%
1.986--3071.50%
9.75--2811.37%
10.18--2491.21%
10.15--2301.12%
10.14--2251.10%
9.00--9.002161.05%
Other9,40745.84%

MDaemon (8,892 servers)

Version Number of Servers Percent
18.0.21,13212.73%
13.5.15125.76%
13.6.34274.80%
16.5.23704.16%
13.0.43594.04%
11.0.33564.00%
13.0.53513.95%
11.0.03343.76%
12.5.61932.17%
12.5.41932.17%
16.0.41842.07%
17.5.21842.07%
17.5.31721.93%
14.5.21671.88%
15.0.31521.71%
18.0.11491.68%
10.0.01341.51%
10.1.21311.47%
16.5.11301.46%
10.1.01111.25%
17.5.11081.21%
17.0.21041.17%
16.0.11041.17%
13.0.2991.11%
18.0.0951.07%
Other2,64129.70%

Microsoft (6,245 servers)

Version Number of Servers Percent
6.0.3790.46753,26752.31%
7.5.7601.1751483013.29%
8.5.9600.1638470611.31%
6.0.3790.39593766.02%
10.0.14393.01812.90%
8.0.9200.163841662.66%
5.0.2195.53291452.32%
7.0.6002.182641071.71%
6.0.3790.1830941.51%
5.0.2195.6713701.12%
Other3034.85%

IMail (1,691 servers)

Version Number of Servers Percent
12.5.6.10130217.86%
8.221689.93%
12.4.1.151539.05%
12.5.5.1151247.33%
12.5.4.1461086.39%
9.231026.03%
12.5.3.93935.50%
12.3.0.100865.09%
8.15744.38%
8.05502.96%
11.03502.96%
12.5.5.117271.60%
11.5271.60%
7.07261.54%
10.01201.18%
10.02201.18%
7.15191.12%
Other24214.31%

CommuniGate Pro (1,429 servers)

Version Number of Servers Percent
6.1.16805.60%
6.0.11563.92%
6.2.7553.85%
6.1.18553.85%
5.4.11543.78%
5.2.20402.80%
6.1.11392.73%
5.1.16372.59%
6.1.19352.45%
5.3.13352.45%
6.2.4302.10%
6.2.6302.10%
6.2.5292.03%
6.1.10281.96%
6.0.9281.96%
6.2.1281.96%
5.2.3271.89%
6.1.2261.82%
6.2.0231.61%
6.1.13221.54%
6.1.12211.47%
6.1.15211.47%
4.1.8201.40%
6.1.20181.26%
6.2.3181.26%
6.1.17181.26%
6.1.5171.19%
6.1.14171.19%
6.1.8171.19%
6.0.10161.12%
5.4.4161.12%
5.3.15151.05%
6.2151.05%
6.2.2151.05%
6.1.9151.05%
Other41328.90%

XMail (893 servers)

Version Number of Servers Percent
1.2742047.03%
1.2227831.13%
1.26586.49%
1.25586.49%
1.24353.92%
1.21141.57%
Other303.36%

Lotus Domino (654 servers)

Version Number of Servers Percent
8.5.3FP612819.57%
8.5.39614.68%
8.5.2324.89%
7.0.2274.13%
8.5.1243.67%
8.5243.67%
8.5.3FP2182.75%
8.5.3FP3172.60%
8.5.3FP4142.14%
7.0.3142.14%
8.5.3FP1142.14%
8.5.2FP2131.99%
8.5.2FP4121.83%
8.5.2FP3121.83%
7.0121.83%
8.0111.68%
8.0.1101.53%
8.5.1FP5101.53%
7.0.1101.53%
6.591.38%
6.5.581.22%
6.5.481.22%
8.5.3FP571.07%
7.0.471.07%
Other11717.89%

Qmail Toaster (636 servers)

Version Number of Servers Percent
1.348676.42%
1.0311417.92%
1.03.5111.73%
1.03.6101.57%
1.2101.57%
Other50.79%

WinWebMail (624 servers)

Version Number of Servers Percent
3.9.0.712820.51%
3.8.1.38513.62%
3.9.0.1447.05%
4.2.0.1406.41%
3.8.0.1375.93%
3.7.6.1304.81%
4.0.0.1284.49%
4.1.0.1243.85%
3.8.1.5243.85%
3.8.5.1193.04%
3.7.3.1172.72%
3.8.6.1172.72%
3.9.5.3162.56%
3.9.3.1162.56%
3.7.7.3132.08%
3.8.1.1132.08%
3.9.2.1111.76%
3.8.2.181.28%
3.9.5.171.12%
3.7.1.171.12%
Other406.41%

SurgeSMTP (573 servers)

Version Number of Servers Percent
7.3e2-213423.39%
7.3i2-28915.53%
7.1e-1427.33%
6.5a2-2295.06%
7.2i-1274.71%
6.7c-1234.01%
6.9c-1234.01%
7.2a-1213.66%
7.0c2-2142.44%
6.5a-1132.27%
3.9e-1132.27%
7.2e-2132.27%
7.3o2-2111.92%
7.3c3-381.40%
4.0u4-471.22%
6.4a-171.22%
5.2a-171.22%
6.1c-171.22%
7.3n-161.05%
7.3j-461.05%
Other7312.74%

Kerio (320 servers)

Version Number of Servers Percent
6.7.36520.31%
6.7.04815.00%
6.5.23210.00%
6.6.2309.38%
6.7.2268.12%
6.5.0154.69%
6.4.1154.69%
6.6.1144.38%
6.7.1123.75%
6.3.192.81%
6.4.082.50%
6.6.061.88%
6.5.161.88%
6.3.061.88%
6.1.341.25%
5.7.941.25%
Other206.25%

Merak (211 servers)

Version Number of Servers Percent
8.0.36128.91%
8.9.14219.91%
8.5.0157.11%
7.6.1115.21%
7.4.5104.74%
8.3.8104.74%
7.5.294.27%
7.6.473.32%
9.0.362.84%
7.4.241.90%
7.2.041.90%
6.0.831.42%
7.0.131.42%
7.6.031.42%
Other2310.90%

MagicMail (184 servers)

Version Number of Servers Percent
Other184100.00%

Post.Office (141 servers)

Version Number of Servers Percent
4.33222.70%
4.2.22417.02%
4.1.2.41510.64%
3.5.3128.51%
4.4117.80%
4.2.1.3107.09%
4.1.142.84%
3.9.2.332.13%
3.1.232.13%
3.5.3J32.13%
3.5.132.13%
4.2.1.132.13%
4.0.121.42%
3.8.7.421.42%
3.9.221.42%
Other128.51%

ArGoSoft (141 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)5236.88%
1.8 (1.8.9.3)2014.18%
1.8 (1.8.9.5)1812.77%
1.8 (1.8.9.1)149.93%
1.8 (1.8.8.8)53.55%
1.8 (1.8.8.9)32.13%
1.8 (1.8.8.7)32.13%
1.8 (1.8.7.3)32.13%
1.8 (1.8.2.1)21.42%
1.8 (1.8.6.0)21.42%
1.8 (1.8.9.2)21.42%
1.8 (1.8.5.8)21.42%
1.8 (1.8.8.4)21.42%
1.8 (1.8.9.4)21.42%
1.8 (1.8.7.6)21.42%
Other96.38%

Gordano Messaging Suite (GMS) (87 servers)

Version Number of Servers Percent
Other87100.00%

GroupWise (87 servers)

Version Number of Servers Percent
14.2.21314.94%
14.2.3910.34%
18.0.2910.34%
14.2.178.05%
14.2.055.75%
14.0.155.75%
7.0.344.60%
18.0.144.60%
18.0.044.60%
6.5.744.60%
7.0.233.45%
8.0.333.45%
6.0.422.30%
6.0.222.30%
7.0.422.30%
6.5.211.15%
8.0.111.15%
6.5.411.15%
12.0.111.15%
6.5.611.15%
8.0.011.15%
7.0.111.15%
6.5.511.15%
6.0.311.15%
6.5.011.15%
18.0.911.15%
Other00.00%

Trend Micro (55 servers)

Version Number of Servers Percent
5.71730.91%
5.181221.82%
5.5814.55%
7.0712.73%
7.559.09%
3.5323.64%
8.511.82%
7.5ready11.82%
811.82%
9.011.82%
Other00.00%

InterScan VirusWall (22 servers)

Version Number of Servers Percent
Other22100.00%

OpenVMS (17 servers)

Version Number of Servers Percent
8.4847.06%
7.3635.29%
8.3211.76%
8.215.88%
Other00.00%

VisNetic (17 servers)

Version Number of Servers Percent
9.3.2.0741.18%
5.5.8.3211.76%
5.8.6.6211.76%
8.0.315.88%
5.0.2.315.88%
9.1.4.015.88%
8.0.3.115.88%
5.0.2.015.88%
8.5.0.815.88%
Other00.00%

Mirapoint (11 servers)

Version Number of Servers Percent
4.4.2a-FCS218.18%
4.3.5-GA218.18%
4.4.3-GA218.18%
4.1.9-GA19.09%
4.3.6-GA19.09%
3.10.10a-GA19.09%
4.4.5-GA19.09%
4.4.6-GA19.09%
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%

Mercury (6 servers)

Version Number of Servers Percent
3.32350.00%
1.48350.00%
Other00.00%

WebSTAR V (4 servers)

Version Number of Servers Percent
5.4.1375.00%
5.3.2125.00%
Other00.00%

Neon Mail Server (3 servers)

Version Number of Servers Percent
3.1.3133.33%
3.0.7133.33%
3.0.8133.33%
Other00.00%

ModusMail (2 servers)

Version Number of Servers Percent
4.1.361.212100.00%
Other00.00%

WebSTAR (2 servers)

Version Number of Servers Percent
Other2100.00%

MessageWall (2 servers)

Version Number of Servers Percent
1.0.82100.00%
Other00.00%




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