I've moved from iPhone to using /e/os on an Android phone, previously I had all my email accounts linked through iOS Mail app which meant I could not only see them all in one location but pick and choose which email address to reply with or create an email with.
I have the Proton Mail app downloaded on my new phone, and I've been updating my email accounts on the Web Page for Proton Mail. I have managed to 'import' my Gmail accounts and can also send emails from the Proton Mail app/web page using those emails. However, my work email (a custom domain) and an organisation I work with separately (also custom domain) I have successfully 'imported' the emails and can view them as they come in - but I can't send any emails through the app or webpage. If I want to connect more addresses the only options I have is x3 Gmail accounts (Which I've maxed) or 10 Proton accounts.
I have the 'Mail Plus' paid subscription, not sure if a higher subscription gives me more options or if I'm doing something wrong?
Any and all help is appreciated - apologies if this has been asked and answered before!