Forward alias to more than main account email
You can create multiple alias linked to multiple account but you can only use one "forward to" email.
Why not having a feature to allow adding other email address, for accounts previously created with another emails we can update the login email by using alias but we must have the forward to email not static.
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TwoEight commented
For people who have mutiple alias on ProtonMail , i think it could be useful to change the mail for "Forwards to"; an email from our ProtonMail account