I propose adding a whitelist feature that can be linked to specific email addresses.

Some addresses are intended for highly restricted communications (e.g., online banking). By allowing users to whitelist only approved domains for such addresses, we can significantly reduce spam and phishing risks while minimizing unnecessary storage consumption.

An account dedicated solely to banking communications could be configured to accept emails only from the bank's domain (@bankname.com).

Given the power and potential impact of this feature, it requires clear warnings and user education to ensure safe adoption.