Only allow login with single/main address/username
Do not allow that you can log into the account with every address.
If my account name is john.smith then only allow login with john.smith or john.smith@protonmail.com. Not with finance.john.smith@protonmail.com or any other address.
Perfect would be if you would have the choice what address can be used in order to log into your account.
With the current way you have to give away your login username in order to send emails. Hiding the username from the public would be an advantage, since they would have to guess your username and the password. Not only one of them.
Rafficer
shared this idea
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Anonymous
commented
The idea to have aliases is submitted many times already. What I would like is that it is not possible to login using an alias and the account password.
Currently, it is possible to login both with the .ch "username" and the .com "username", one of which is an alias. The more combinations of username and login, the higher the chances someone breaks the combination...