I have a catchall inbox so I can just make up any email I want and everything gets forwarded to the catchall inbox. It’s pretty easy to set up if you do host your own mail server (which is relatively easy for receiving mail). Obviously this doesn’t integrate with bitwarden or anything, though. If you want to forward emails to your main email account on a big provider you’re going to have to make sure your server can send emails you can potentially use a relay service for this, or just set it up yourself (you’ll mostly just need some DNS records for SPF / DMARC / DKIM).