I'm fairly new to Proton Mail (but have used many different email clients over the decades) and I'm astonished that Proton thinks this is acceptable! Very much a 'trust us' approach rather than giving the user information that would allow them to visually check the 'From' address rather than just seeing the main Proton address.

I picked this up immediately after I replied to an email from one of my alias addresses. I have contacted Simplelogin about it, and suggested that in the From box they show the alias address with [alias of ***.proton.me] appended so you can see which of your supposedly protected Proton emails it was linked to.

Or even (although less useful) put in the From box something like 'ALIAS OF ***.proton.me' with a hyperlink so you can go and see which alias it is.

It is really not on that I see my Proton main email in the From box when I reply to an alias even though it may actually be sent from the alias internally.

It's probably because Simplelogin is a bolt-on to Proton Mail and not native to it, but that's beside the point. Proton need to sort this urgently.

Same goes for responding to a particular email. I want my personal accounts to use one email, but when I respond, it defaults to my generic email confusing everyone. I'd rather have the send-from email field be blank than have it send from one I do not want to use, because I have to remember to check/change the field. It doesn't seem like it would be e that difficult to set an email for each contact, but I am not a programmer.

Hey Proton, any estimates of when you can add this? This should be part of your aliases out of the box, as currently there's no way to be sure whether the email was sent from the alias or not, which totally defeats the purpose of privacy the aliases are used for.

Additionally to the problem replying, when sending a first email, one has to first add the receiver as "contact" under the alias and then cross fingers that this 1) was processed correctly and 2) one did not any mistakes like a typo or adding it to the wrong alias, when sending the email with the main address as sender. And one also doesn't get to know whether it worked, unless adding oneself as bcc. Seriously?

Is there anyone there thinking about user experience, or making features minimally viable..?

This is something that really bothers me a lot. Seeing the appropriate alias in the from field would assure me that I haven't somehow boogered it, and revealed my private core email!