I'm surprised this has so few votes.
Maybe the reason why Proton has sat on this for 2 years, with no evidence of any movement?

Wow! Under consideration for 10 years. Proton has a lot of basic features that needs to implement before making any new products. There are basic features and "easy" to implement.

The inability to create an alias in Mail is a real drawback. Please implement ASAP.

I think the main need is to use alias in the "from" area when sending an email
Some possibilities
- when an alias is created, to have a check box asking "do you want to use this alias to send email?" In that case, it would be good to put the "sender names" that will be displayed for the person how will receive the mail. ANd nothing else to do to have the possibility to choose the alias as sender (no reverse ..... no simplelogin, no ......)
- And what about managing yourself (protonmail) the alias and not using an other compagny? In that case alias would be like xxxxx.yyyyyyy@pm.me and not xxxxxx.yyyyy@passinbox.com?
------ some website are rejecting alias emails
------ it should be more easy to manage for you and for us

Requesting since October 2024. Will I become an old man before its done? :'(

Please please please implement this asap.

Apple has it in Apple Mail. I’m sure Proton can do it better! ;)

Such a basic feature. Unbelievable that it hasn't been implemented yet!

We don't want to copy and paste SimpleLogin's reverse alias every time when we write email

This seems a fundamental requirement for privacy, the core value of Proton

Better integration needed for proton hide-me aliases. Unable to send using hide-me alias, not intuitively at any rate...

Still waiting, hoping it arrives soon™
And besides what everyone else has already suggested, add some icon or coloring to identify in the From and To "original addresses" from "alias" and "reverse-alias" ones? Like when I select one of the contacts I know I am not messing up and using the final address instead of the reverse alias. Or what others said and a checkbox or button that automatically reuses/generates alias+reverse-alias in-place. Thank you very much for your efforts.

same here, countless times I leaked my mail cause of that.

to have to remember to login to simplelogin and copy the reverse alias is a flow that I keep forgetting.

I can only send emails to adresses listed in my simplelogin aliases contacts when replying.

So from time to time I write an address directly, boom address leaked , I get it that this is how it is grown, but just add the ability to select an alias from the web/desktop web app when sending to a mail listed in simplelogin alias contacts

and WARN if I attempt to send an email to a simplelogin contact with my real email

The ability to create +aliases and use them in reply-to emails would highly facilitate mail sorting for lots of people.

Still waiting since Oct 2024. :)

i find it hard to believe you can send emails from your aliases, especially since this has been requested for such a long time now. Please implement asap, thanks.

When logging in with an alias, this is set in Proton Mail as the ‘top on the list’ send from mail address, this is not handy.
Also, the default ‘send from email’, when responding to an incoming alias email, is now set by default to the primary Proton email. This can create problems by accidentally exposing the primary email when responding.

Create a separate menu to set the default ’sent from’ email, to be chosen from primary or aliases, no matter if you’re starting an email or responding to any email.

Compose and send email directly from Simplelogin alias

When sending an email, selecting a simplelogin alias should be offered from the "Compose" window for new messages (reply is an already working scenario).

A suggestion for the approach would be having in the "From" combo list a search box in the first element with and integrated search of simplelogin aliases.

Then, depending on the alias selected and the recepient, the recepient should be changed automatically by the reverse alias.
If the contact is not in the alias list, then create the reverse contact.

Also having a "by default" reverse alias for contacts (in addition of the real email) would be wonderful.

I hope that contact sync in android be in the not so far future and in that case it's interesting having the real email for other apps and in proton mail the default reverse alias.

Just signed up for unlimited and this is by far the most frustrating problem I've run into.

For example I want to contact people on Craigslist using an alias. There is no quick way to do this since Craigslist uses a string of numbers@sale for addresses. Do I need to add every single email to Pass before using Mail?

I subscribed to Mail mainly because I wanted an efficient way to organize aliases and online shopping.

Stilllllll eagerly waiting….. ;)

Edit: I just realized this was posted in 2016, nearly 10 years ago!