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I have a server with a website and postfix, and one associated email address webmaster@site.com. I can send secure emails from the website (from php), receive emails for webmaster, which I redirect to another address using aliases. That works fine.

Now I have a couple questions:

I don't need external SMTP login, how do I disable it? I only want to receive emails for "webmaster", not login in smtp as "webmaster" or any other user. (I thought to remove "permit_sasl_authenticated" but will that be enough? How do I remove unauthenticated one?)

How I limit addresses who can receive email? Again, I only want to be able to receive emails for "webmaster" which will be redirected to my true address, but disallow all other recipient addresses.

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