How to use the catch-all but block some addresses

[infrequently]

Hi there,

I use the catch-all-feature, so any address can be used as a temporary E-Mail-address without configuration. If the address will be permanently used, I create an alias or an account with this address (BTW: the mail-server is used only by me and my family).

But some addresses never used before are getting spam E-Mails. I suspect that the previous owner of the domain used these addresses.
And my domain name seems to be similar to a little online-shop, so I am getting some requests and offers.

What I like to do:
Block all the addresses I know to get spam and/or requests regarding the online-shop (about 20 addresses)
But keep using the catch-all-Feature.
Attempts to send an E-Mail to a blocked address should be answered with any kind of 5xx-Code, so that a legitimate sender knows something went wrong.

How can I do that?
Any idea is appreciated.

PS: Using stalwart mail-server 0.73

[mdecimus]

There are different ways to block these addresses. If you are certain that these addresses only receive SPAM you can add them to the spam trap list which will not only block them but also train the spam filter with the message contents.
Another alternative is blocking them from a Sieve filter.

[infrequently]

Thank you very much for your reply.

I already thought about a spam tram, but only one or two addresses (of the twenty) may be useful for that.

I think I will try a Sieve script for the rest. Sieve script is something new to me, so I did not thought about it as a solution. :)
BTW: Is there a Value for the account or the recipient email address? A kind of "X-Delivered-To" or something like that. Otherwise a Sieve script depends on the (I think unreliable) "TO" or "CC" values, or not?

[mdecimus]

Yes, you should use the envelope address instead.

[infrequently]

Thanks for all your help.
My first try looks okay, just (needs more testing).
And using Sieve script was easier as I thought.