+1 Oh yes, please! This is the only thing holding me back from purchasing Proton plan and moving away from Google.

without this feature a cannot migrate to Proton

+1 to this, I would already be paying for proton mail if the desktop app on my laptop had support for external email accounts. It's borderline criminal that a paid service doesn't support multiple email accounts.

This is the one feature holding me back from migrating over from gmail to proton mail.

Vouching in, as an association I personally use currently offers two useful services:

- Email forwarding – a single, stable address that can redirect messages to any new mailbox when members change email providers.
- SMTP “send‑as” capability – the ability to send mail from that forwarded address. Acts only as a forwarding proxy which users trust.

It would be fantastic if Proton Mail could bring these same functionalities into the web interface, so users could:

- Keep one permanent identity to trusted services.
- Send messages from their forwarded address directly within Proton Mail.

Integrating these features would greatly simplify account management and improve continuity for users who rely on forwarding and “send‑as” workflows.

Please add this. It means I can't properly use proton mail with an email being forwarded to me

This is the only feature missing in ProtonMail preventing me to leave GMail completely. I need to be able to send emails from my .edu account

It's the only feature missing @ protonmail and keeping me with google...

My domain is hosted in Switzerland, and I've configured its mail server to forward all emails sent to my address, me@example.net, to my Proton Mail address, username@pm.me. This forwarding setup is working correctly, and I've also added me@example.com as a sending address within my Proton Mail account.

However, when I receive an email at me@example.net (which is then forwarded to Proton Mail), and I click 'reply,' Proton Mail defaults to using my username@pm.me address as the sender.

Ideally, since the original email was addressed to me@example.net (as indicated in the 'To:' header), I would expect Proton Mail to automatically select me@example.com as the 'From:' address when I reply.

By the way: this is also, how other providers like Gmail handle this case.

Even after switching from Gmail, many of us still rely on it for non-essential accounts or less relevant conversations. Ideally, there should be a way to reply from ProtonMail while appearing to respond from the Gmail address. This would maintain both continuity and consistency, without exposing the ProtonMail account. As we all know, fully moving away from Google is nearly impossible. And simple login is not the best solution for it. Any way to do something about this?

I want to be able to reply to and send emails using the same email addresses I forwarded to ProtonMail, directly from ProtonMail’s webmail, without using third-party clients.

this + fetch via imap. I have a few email addresses where I cant move the domain into proton, yet need to use email addresses regulary :(

Really would help with migration to be able to send from the old address, especially to communicate with entities who are very slow / difficult to update the email address there.
You basically need to implement a sort of SMTP client in the web, to be able to send as someone else's hosting

I agree with others on here. I was hoping to migrate away from Gmail but need to be able to send mail as my other company domains. Without this feature, I am going to have to stick with Google.

Is there any timeline on this feature being added?

Just migrated from Gmail, and amazed to find that Proton doesn't have this ability! I need to be able to send email from me@mycompany.com, and also from me@mypersonaldomain.co.uk. With Gmail I just set it up to send through the domain's SMTP servers. If I can't find a solution to this unfortunately I'm going to have to leave Proton :(

This would save me so much time. Some things I cannot change from gmail to proton, so I still have to go back to gmail to sent a few emails a month.

Related to https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/46229314-add-support-for-gmail-accounts-external-mail-acco I believe

Yes please, this would be a game changer

I have a gmail account connected to my proton via auto forward, but I would like to send emails and reply to emails straight from proton with the gmail account's email address.

This really seems to be a killer feature that Google implemented in GMail early on. I just opened a support ticket asking about this feature, and I included 15 links of user requests for this feature, across UserVoice and Reddit, showing that there are literally hundreds of Proton Mail users who are interested in this feature. Hopefully we can get a serious response from them to honestly evaluate this request.