Step by step easy guide to enforced TLS on postfix needed

Hi all

I am trying to configure a centos server with postfix to only allow enforced TLS email to be sent to a certain number of domains.

If the domain isn't in the list then the email shouldn't send and if the server at the other end doesn't accept TLS then it shouldnt send either.

I have tried to follow a few online help guides but struggling to make it work as even if I add the lines to and the email still gets through when I use the "mail -s Test email" command to both TLS and non TLS servers.

Can you please help me from scratch to get this sorted.

Who is Participating?
timb551Connect With a Mentor Author Commented:
I have restarted the daemon yes.  the link only goes on about "may" not "enforced".  I will have another go substituting this and see how i get on.
Joseph GanSystem AdminCommented:
Have a look of this link:

By the way, have you restarted mail deamon after the changing?
timb551Author Commented:
Issue not resolved so went down another route.
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