Enable or disable login option into account for additional email adresses
In order to prevent others from knowing my login username to my protonmail account, , it woul be very helpful if one could disable or enable the use of additional email addresses as user login name. Currently I can login into protonmail with all my email addresses. But I would like to choose which adress I exclusivley use for login into my account. For this it would be very helpful, if I could enable or disable for every email adress the login option. This would enhance account security drastically because "regulary" used email addresses to not reveal the username of the account.

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Andy commented
This would be an awsome feature. Would also add a lot of security.
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Lars commented
I was just about to suggest this! +1
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J commented
I was going to suggest this myself. I just discovered, to my dismay, that *any* of my addresses can be used for login! I had designated one additional address to be "public facing" so that I could share that address freely on the web, without revealing the username for *all* my ProtonMail services... Turns out that is not how things work.
Enable/disable would be an excellent addition. Given a choice, I would only use my original username for login - and that's it.