Outgoing email problem on Cpanel 92

Operating System & Version
Windows 7
cPanel & WHM Version


Well-Known Member
Oct 13, 2005
Kolkata, India
cPanel Access Level
Root Administrator
We are having an odd problem with sending mail through Windows 7 computers on CPANEL 92 server.

We bought a new server with CPANEL 92 on Centos 7.x. We migrated a few domains from the old 86 server running on Centos 6.x. After the update, some people are able to send emails but most others are not.

Current scene
After a few chats with data centre personnel and several hours of debates with the clients, We have come to a conclusion that people with windows 7 are having a problem sending emails though people with Windows 10 can.

We tried to use port 587 (the earlier setting) as well as port 465 with SSL/TLS but the connection just does not happen. Incoming mails are working.

Are you aware of any such problem and the corresponding solution?


Jurassic Moderator
Staff member
Oct 19, 2014
cPanel Access Level
Root Administrator
Hey there! Older versions of Windows not being able to send mail is a known issue. You can find many more details on this in our support article here:

so I'd encourage you to read through that option as there are a few different solutions presented. Let me know if you have questions!