SMTP SSL - Don't know if it's working properly or not (newbie)

Mail is currently working. I can send and receive with no problems at all.
In Mail>Advanced>Security I have these settings: IMAP/POP "Require" for SSL and SMTP to "USE".
But, if I change SMTP to "Require", addresses outside my domain cannot send to me.
User receives "Delivery Notification Failed", Diagnostic code: smtp;530 5.7.0 Must issue a STARTTLS command first.
Addresses on my domain, however, can send with no problem.
I get these messages in IMAP>Log:
TLS server engine: cannot load CA data
and:
starttls: TLSv1 with cipher AES128-SHA (128/128 bits reused) no authentication
I don't know what to make of this or how to fix.

But, if I change SMTP to "Require", addresses outside my domain cannot send to me.
Sure. You can't expect every other mail server to support SSL. Those that don't (probably the majority) won't be able to send mail to your domain since they can't initiate an SSL session.
You should either have SSL set to 'USE' and trust that your clients are setup correctly, or use a different port for your clients and leave the public port set to 'Use'.
TLS server engine: cannot load CA data
This is a separate, unrelated issue. It isn't clear from your post whether this happens when the server starts, when specific clients connect, or when any client connects. Can you post more of the log?

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