I have created an email account, email@example.com. I have created an alias for that account, firstname.lastname@example.org. Now, emails to email@example.com are delivered to the INBOX of firstname.lastname@example.org. This is great. Even better would be to deliver emails to email@example.com to the TRASH folder for the firstname.lastname@example.org account. I use several different clients for this account. How do I do this on the server side? Thank you.
Add a sieve rule in SOGo (or via your email client).