Steve Poe writes:

I understand I can add a file to the /etc/courier/smtpaccess folder
with appropriate allow/block rules file (which I am still trying to figure
out. Can I do this by email address as well in addition to IP address?

No.

You do realize that anyone can send you an email with a return address set to [EMAIL PROTECTED], so something like that would accomplish absolutely nothing. Furthermore, the sender's email address is not known well until after a connection is accepted, and these rules block connections from being established in the first place.

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