SimpleLogin seamless integration for email alias reverse-alias usage
SimpleLogin works very well with Proton Mail, and it's great that this is now included in certain paid subscriptions, however there are some opportunities for a more seamless integration in the Proton Mail apps (Web and Mobile), in particular:
Receiving emails:
Option to show actual email address as sender instead of reverse-alias under "From" (i.e. use "X-Simplelogin-Envelope-From" email header where enabled instead of "From").Sending emails:
Option to select email alias as sender under "From" (in the same way as "real" addresses/mailboxes) and then use actual email addresses (rather than the reverse-aliases) under "To", and have Proton Mail automatically use (and generate if not yet created) the reverse-alias addresses for each of the recipients.Managing aliases:
Option to create a new alias from Proton Mail (i.e. under "Manage my addresses").
Essentially, the idea would be that when using the Proton Mail apps, one could use an email alias in exactly the same way as a "real" email address/mailbox, and have Proton Mail handle all the reverse-alias generation/substitution transparently to the end-user (at first glance, there would ideally still be some way of indicating that addresses have been substituted, perhaps with an icon next to the address that when clicked will show the reverse-alias that is actually used to send the email).

Hi everyone, here with a little update on this one:
#1 is complete. The original sender email is shown as the display name for the alias in the from field.
#2 is under consideration, pending anti-spam measures we may have to take. This is also a duplicate request, so we'll be continuing the conversation here: https://protonmail.uservoice.com/forums/284483/suggestions/15523956
#3 is complete and included in the Proton Mail side panel.
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Alex commented
Maybe I'm misunderstanding the question, but isn't done using a reverse-alias?
Specifically, under "Aliases" in SimpleLogin, find the alias you want to send as then click "Contacts", enter the email you are sending to in the textbox, "Create reverse-alias" then copy that reverse-alias to use as the recipient in Proton Mail.
Agreed it's rather convoluted though (it's simpler if you are replying to an email, as SimpleLogin automatically replaces the actual senders with these reverse-aliases), and it would be great if Proton Mail had more seamless integration with SimpleLogin (e.g. select to send as alias which would then auto-create/substitute the reverse-alias).
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Eric Johnson commented
Strictly speaking, there is a way to do this, but it is a bit of a pain in the neck.
You can reply to an e-mail that came to an alias and it uses that address in the reply.
So send yourself an e-mail to that alias. Then whenever you want to send an e-mail using that aliases as the sender, reply to the mail you sent yourself and change the title and recipients name and get rid of the text in the message you sent yourself.
Try it. Suppose your address is example@proton.me. Send yourself an e-mail to example+3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475@proton.me. Then use reply to send a message to a friend.
Note that one downside to using aliases is that the PGP encryption no longer works. Each '+' alias you use would need its own PGP key. If you could identify '+' addresses that you would like to use for encrypted e-mail, it would be nice to be able to select those '+' addresses and create a PGP key for each of them.
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S commented
Simplelogin allows me to have emails sent to an alias email address. There is no way of sending of email from protonmail from that alias address though.