Hi everyone.
I found an answer here:
https://www.reddit.com/r/ProtonMail/comments/15zkc6t/alias_forwarding_only_limited_to_proton_email

Basically you need to log into your simplelogin account (which is automatically created by proton when you sign up) which proton uses to create aliases. There you can configure more email addresses. You can then select those when creating aliases in Proton.

This is a critical one for me! I just set up two separate Proton email accounts (one personal, one business), and I wish I could toggle between the two addresses in Proton Pass. As it is now, I have to sign out of my personal account, then sign back in with my business account, simply to create an alias that will forward to my business account.

Within that, would love the ability to toggle between multiple emails tied to my personal account (e.g. myname-shopping@proton.me, myname-newsletters@proton.me) so that I can set up rules allowing everything forwarded to my "shopping" email to automatically go into the "shopping" folder. That will help me keep my inbox clean, which is super important b/c Proton hasn't yet implemented the "categories" feature that Gmail has. Thank you!

This is one of the features that would convince me to start using Pass.

It sounds like what I wanted to post, so I support it, and this is what I say :

I learned that you can’t do an email forward...

So here’s my solution:
- allow forward. Maybe under certain conditions (although I don’t understand why this is a problem for Proton)

Example where redirection is useful:
In the outgoing mailbox (***@***.com), emails are redirected to ***@passinbox.com.
In the reception mailbox (***@proton.me), a filter is created that will say: all emails from ***@passinbox.com will have to go to this folder.
Then, regardless of your address changes on the sending email box (***@***.com), all redirected emails will always be sent to your target folder.
If you decide to create a new email address on your outgoing mailbox (***@***.com), there will be no change to your filter on the inbox (***@proton.me), it will still work.

If now the alias cannot be used to redirect:
In the outgoing mailbox (***@***.com), emails are redirected to ***@proton.me.
In the inbox (***@proton.me), a filter is created that will say: all emails from 111@***.com, 222@***.com, 333@***.com, etc., will have to go to this folder.
Then, with each address change on the sending email box (***@***.com), you will have to think about adding the new address in the filter on the receiving email box (***@proton.me).
In other words, you will forget more than once.

I am paying for the Proton Family plan and can have up to 90 email addresses defined. I should be able to configure the alias address in ProtonPass to forward to any of my 90 email addresses, not just my primary one.

I want different proton pass aliases to be relayed to different email addresses that i have created not just xyz@protonmail.com. this will help me manage my online privacy much better. I'll be able to put into required different folders and so on.

we should have a choice to buy mail and pass plus only

allow users to choose a forwarding address for aliases in proton pass (either among other proton email accounts besides the primary or any account from any email provider).

Change 'Forwarded to' address! Having the main account address as the only option for forwarding is almost asking for trouble!

Even Apple permit additional/chosen forwarders!

Allow us to add multiple emails to our proton pass account and when creating an email alias allow us to choose which email it gets forwarded to.

I agree, I want this feature too. I was disappointed to see I could not change the "Forwards to" on the Proton Pass app.

Yes, it would be wonderful if we can choose a different additional email address that we have created in Proton Mail to be able to choose which email address we want the alias forwarded to in Proton Pass.

Check this ! :-) - https://www.reddit.com/r/ProtonPass/comments/18nou5c/question/

After i add all my email to this service (simplelogin with proton) - all e-mails in "forward column" appear :)

Same here! This is first thing, what i want do do after buy subscription and register proton domains :-(

Completely agree!
I use quite some alias addresses in Proton Mail to sort my emails via rules directly in folders.
The alias email addresses in Proton Pass are great, but if I can only forward them to my main Proton Mail email address, I would completely lose this possibility, when I would use Proton Pass, so its a blocker for me.

Would be great, if you could add this feature, as it is already in the UI anyway. Please just make it possible to select one of of the other alias addresses connected to protonmail as well - Thanks!!

Pass plus is a password manager subscription. Currently, it allows unlimited aliases, but it is only allowed to forward the emails to the email address of the subscription. This is a severe limitation because with the pass plus subscription you are stuck with a free email account and it is not feasible to forward all emails to an account that has limitations such as 150 messages per day. Also, the size of the inbox can be an issue.

The issues with the Pass plus subscription can be overcome in two ways:

1) Let the Pass plus users change the email that alias is forwarding to whatever email the user wants.

2) Allow users to have simultaneous subscriptions such as pass plus (whether it is the lifetime -75% or regular) and mail plus subscription. It can be seen that proton unlimited is favored as a all-or-nothing subscription, but with these limitations pass plus itself is not a viable option

It woud be great seeing this. Currently th only way to do that is also to have a sub on simplelogin, which shoundn't happen

Definitely needed, and there is a greyed list menu in proton pass. It's confusing we think it's something available, but it is not.

This would be fantastic

This would be a fantastic update - would for example allow e-mails to be forwarded to a "junk" / "account" e-mail address.