I want to switch from Proton and am looking at Mailbox.org. (This is probably not exclusive to Mailbox.org.) Alias are limited with Mailbox.org, which I’m not a fan of. But extensions can be used as well. Although they don’t seem as anonymous as aliases? Can someone give their perspective on this?
Actually you can modify this in the basic settings.
Found it!
Damn, I’ll need to have another look. Those settings can be a bit difficult to navigate