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Mail (MX) Server Survey
November 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 Queried1,803,256   100.0%
Number of Servers that didn't respond304,97616.91%
    Server didn't open socket298,99716.58%
    Server didn't provide banner5,9790.33%
Server provided banner1,498,28083.09%
Server banner identifies software in use931,51751.66%

As indicated by the above table, of the 1,803,256 servers queried, only 931,517 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
Exim528,05656.69%
Postfix320,81434.44%
Sendmail39,3724.23%
MailEnable20,4952.20%
MDaemon8,8820.95%
Microsoft6,1410.66%
IMail1,6690.18%
CommuniGate Pro1,4160.15%
XMail9080.10%
Lotus Domino6350.07%
WinWebMail6290.07%
Qmail Toaster6220.07%
SurgeSMTP5730.06%
Kerio3170.03%
Merak2100.02%
MagicMail1840.02%
Post.Office1410.02%
ArGoSoft1360.01%
GroupWise860.01%
Gordano Messaging Suite (GMS)830.01%
Trend Micro550.01%
InterScan VirusWall190.00%
VisNetic170.00%
OpenVMS170.00%
Mirapoint110.00%
Mercury70.00%
Interscan60.00%
Neon Mail Server50.00%
WebSTAR V40.00%
MessageWall30.00%
ModusMail20.00%
WebSTAR20.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (528,056 servers)

Version Number of Servers Percent
4.91397,67075.31%
4.8933,6176.37%
4.8730,9345.86%
4.9014,8552.81%
4.8413,2502.51%
4.805,5901.06%
Other32,1406.09%

Postfix (320,814 servers)

Version Number of Servers Percent
Other320,814100.00%

Sendmail (39,372 servers)

Version Number of Servers Percent
8.15.211,64829.58%
8.14.48,21420.86%
8.13.85,11512.99%
8.14.53,2468.24%
8.13.13,2068.14%
8.14.72,6376.70%
8.14.91,6344.15%
8.14.39552.43%
Other2,7176.90%

MailEnable (20,495 servers)

Version Number of Servers Percent
10.12--2,45511.98%
9.00--2,11510.32%
9.16--1,8659.10%
8.60--6623.23%
8.53--6593.22%
6.5--4922.40%
8.51--4552.22%
10.18--3521.72%
10.16--3441.68%
8.60-8.60-3321.62%
8.04--3201.56%
1.986--2971.45%
9.75--2701.32%
10.15--2211.08%
10.14--2201.07%
9.00--9.002161.05%
10.18--10.182071.01%
Other9,01343.98%

MDaemon (8,882 servers)

Version Number of Servers Percent
18.0.28739.83%
13.5.15015.64%
13.6.34334.88%
16.5.23814.29%
13.0.43654.11%
13.0.53493.93%
11.0.33473.91%
11.0.03413.84%
18.5.03303.72%
12.5.41962.21%
12.5.61962.21%
16.0.41741.96%
17.5.21741.96%
14.5.21701.91%
17.5.31541.73%
15.0.31471.66%
10.0.01321.49%
18.0.11321.49%
10.1.21311.47%
16.5.11251.41%
17.5.11041.17%
10.1.01041.17%
17.0.21011.14%
16.0.1981.10%
13.0.2941.06%
18.0.0891.00%
Other2,64129.73%

Microsoft (6,141 servers)

Version Number of Servers Percent
6.0.3790.46753,20652.21%
7.5.7601.1751481013.19%
8.5.9600.1638469311.28%
6.0.3790.39593786.16%
10.0.14393.01923.13%
8.0.9200.163841662.70%
5.0.2195.53291402.28%
7.0.6002.182641071.74%
6.0.3790.1830931.51%
5.0.2195.6713701.14%
Other2864.66%

IMail (1,669 servers)

Version Number of Servers Percent
12.5.6.10130418.21%
8.2217210.31%
12.4.1.151539.17%
12.5.5.1151257.49%
12.5.4.1461056.29%
9.231016.05%
12.5.3.93905.39%
12.3.0.100845.03%
8.15734.37%
11.03513.06%
8.05492.94%
12.5.5.117271.62%
11.5221.32%
10.02211.26%
10.01201.20%
7.07191.14%
7.15181.08%
Other23514.08%

CommuniGate Pro (1,416 servers)

Version Number of Servers Percent
6.1.16755.30%
6.2.7644.52%
6.1.18543.81%
6.0.11543.81%
5.4.11533.74%
5.3.13372.61%
5.2.20372.61%
6.1.11372.61%
5.1.16372.61%
6.1.19342.40%
6.2.1302.12%
6.0.9292.05%
6.2.6292.05%
6.2.4292.05%
6.1.10281.98%
5.2.3271.91%
6.1.2241.69%
6.2.5241.69%
6.2.0231.62%
6.1.12211.48%
6.1.15211.48%
4.1.8211.48%
6.2.8201.41%
6.1.13191.34%
6.1.17181.27%
6.1.8181.27%
6.2.3181.27%
6.1.20171.20%
6.1.14171.20%
6.1.5161.13%
6.0.10151.06%
5.4.4151.06%
Other45532.13%

XMail (908 servers)

Version Number of Servers Percent
1.2743147.47%
1.2228331.17%
1.25606.61%
1.26576.28%
1.24343.74%
1.21121.32%
Other313.41%

Lotus Domino (635 servers)

Version Number of Servers Percent
8.5.3FP612519.69%
8.5.39615.12%
8.5.2345.35%
7.0.2274.25%
8.5.1243.78%
8.5223.46%
8.5.3FP2182.83%
8.5.3FP3142.20%
8.5.3FP1132.05%
8.5.3FP4132.05%
7.0.3132.05%
8.5.2FP2121.89%
8.0111.73%
8.5.2FP4111.73%
7.0111.73%
8.5.1FP5101.57%
8.5.2FP3101.57%
8.0.191.42%
7.0.191.42%
6.591.42%
7.0.471.10%
6.5.471.10%
6.5.571.10%
8.5.3FP571.10%
Other11618.27%

WinWebMail (629 servers)

Version Number of Servers Percent
3.9.0.712419.71%
3.8.1.38213.04%
3.9.0.1436.84%
4.2.0.1416.52%
3.8.0.1365.72%
3.7.6.1284.45%
4.1.0.1274.29%
3.8.1.5274.29%
4.0.0.1264.13%
3.8.6.1182.86%
3.8.5.1172.70%
3.7.3.1172.70%
3.8.1.1172.70%
3.9.3.1162.54%
3.9.5.3142.23%
3.7.7.3121.91%
3.8.3.1111.75%
3.9.2.1111.75%
3.8.2.1101.59%
3.7.1.181.27%
Other447.00%

Qmail Toaster (622 servers)

Version Number of Servers Percent
1.347776.69%
1.0310917.52%
1.03.5111.77%
1.2101.61%
1.03.691.45%
Other60.96%

SurgeSMTP (573 servers)

Version Number of Servers Percent
7.3e2-212321.47%
7.3i2-29917.28%
7.1e-1427.33%
6.5a2-2305.24%
7.2i-1274.71%
6.9c-1234.01%
6.7c-1213.66%
7.2a-1203.49%
7.0c2-2152.62%
3.9e-1142.44%
7.3o2-2122.09%
7.2e-2122.09%
6.5a-1122.09%
6.4a-181.40%
7.3c3-381.40%
7.3j-471.22%
6.1c-171.22%
5.2a-171.22%
4.0u4-471.22%
7.3n-161.05%
Other7312.74%

Kerio (317 servers)

Version Number of Servers Percent
6.7.36219.56%
6.7.04413.88%
6.6.23310.41%
6.5.23210.09%
6.7.2299.15%
6.6.1165.05%
6.5.0154.73%
6.4.1144.42%
6.7.1123.79%
6.3.1103.15%
6.4.072.21%
6.6.061.89%
6.5.161.89%
6.3.061.89%
6.1.341.26%
5.7.941.26%
Other175.36%

Merak (210 servers)

Version Number of Servers Percent
8.0.35827.62%
8.9.14320.48%
8.5.0157.14%
7.6.1115.24%
7.4.5104.76%
7.5.2104.76%
8.3.8104.76%
7.6.473.33%
9.0.373.33%
7.4.241.90%
7.2.041.90%
6.0.831.43%
7.6.031.43%
7.0.131.43%
Other2210.48%

MagicMail (184 servers)

Version Number of Servers Percent
Other184100.00%

Post.Office (141 servers)

Version Number of Servers Percent
4.33323.40%
4.2.22417.02%
4.1.2.41510.64%
3.5.3128.51%
4.4128.51%
4.2.1.385.67%
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 (136 servers)

Version Number of Servers Percent
1.8 (1.8.9.6)4936.03%
1.8 (1.8.9.3)1813.24%
1.8 (1.8.9.5)1813.24%
1.8 (1.8.9.1)128.82%
1.8 (1.8.8.8)53.68%
1.8 (1.8.7.3)42.94%
1.8 (1.8.8.7)32.21%
1.8 (1.8.8.9)32.21%
1.8 (1.8.2.1)21.47%
1.8 (1.8.9.4)21.47%
1.8 (1.8.6.0)21.47%
1.8 (1.8.9.2)21.47%
1.8 (1.8.5.8)21.47%
1.8 (1.8.8.4)21.47%
1.8 (1.8.7.6)21.47%
Other107.35%

GroupWise (86 servers)

Version Number of Servers Percent
14.2.21416.28%
18.0.21011.63%
14.2.389.30%
14.2.178.14%
14.2.066.98%
14.0.155.81%
7.0.344.65%
18.0.144.65%
6.5.744.65%
18.0.033.49%
8.0.333.49%
6.0.422.33%
6.0.222.33%
7.0.222.33%
8.0.111.16%
6.5.411.16%
6.5.611.16%
6.5.511.16%
14.0.011.16%
8.0.011.16%
7.0.111.16%
12.0.111.16%
7.0.411.16%
6.0.311.16%
6.5.011.16%
18.0.911.16%
Other00.00%

Gordano Messaging Suite (GMS) (83 servers)

Version Number of Servers Percent
Other83100.00%

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 (19 servers)

Version Number of Servers Percent
Other19100.00%

VisNetic (17 servers)

Version Number of Servers Percent
9.3.2.0741.18%
5.5.8.3211.76%
5.0.2.3211.76%
8.0.315.88%
5.8.6.615.88%
9.1.4.015.88%
8.0.3.115.88%
6.2.2.015.88%
8.5.0.815.88%
Other00.00%

OpenVMS (17 servers)

Version Number of Servers Percent
8.4847.06%
7.3635.29%
8.3211.76%
8.215.88%
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%

Mercury (7 servers)

Version Number of Servers Percent
1.48457.14%
3.32342.86%
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%
3.1.2120.00%
3.1.0120.00%
3.0.8120.00%
Other00.00%

WebSTAR V (4 servers)

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

MessageWall (3 servers)

Version Number of Servers Percent
1.0.83100.00%
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%




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