How can I block email addresses in catch all?

[userino]

Hi.
I've got a question.
I can activate the "catch-all" in the mail settings, so that all emails are forwarded to a mailbox.
Then I can enter a random address on any page, because everything is forwarded (e.g. cloudronforum@cloudron.com).
If an address is now leaked (cloudronforum@cloudron.com), can I prevent all emails sent to this address from being forwarded? The other mails should of course still be forwarded...
Is there such a black list?

[fbartels]

@userino said in How can I block email addresses in catch all?:

Is there such a black list?

yes, its explained at https://docs.cloudron.io/email/#address-blocklist

[andreasdueren]

@fbartels said in How can I block email addresses in catch all?:

@userino said in How can I block email addresses in catch all?:

Is there such a black list?

yes, its explained at https://docs.cloudron.io/email/#address-blocklist

I thought these addresses are only checked for in the from fiel not the to?

[subven]

@userino said in How can I block email addresses in catch all?:

If an address is now leaked (cloudronforum@cloudron.com), can I prevent all emails sent to this address from being forwarded?

Collecting mail via catchall is not common but I have a pretty messed up solution to you problem ^^ You could create an actual inbox for the address you want to block and delete or reject all incoming mails via a mail sieve filter. To make it easier, every time you want to "block" another incoming address, you could make it an alias of said "special" mailbox.

[robi]

@subven said in How can I block email addresses in catch all?:

You could create an actual inbox for the address you want to block and delete or reject all incoming mails via a mail sieve filter.

AKA the /dev/null mailbox

[fbartels]

@andreasdueren said in How can I block email addresses in catch all?:

I thought these addresses are only checked for in the from fiel not the to?

No, to the best of my knowledge it applies to any addresses in the mail. In any case this is how I prevent these kind mails from popping up in my mailbox.

@subven said in How can I block email addresses in catch all?:

via a mail sieve filter

That could work as well, but another mailbox is not necessary. You can just filter on the recipient address.