Allow alternative sender from client application
I am using the catch-all domain feature so that I can filter emails into specific folders for specific subscriptions and correspondence. I do this because I do not want a single email account associated with the large number of companies that I interact with. I know that the web browser allows you to create an alternative sender for these various email addresses, but I cannot use this feature on a third-party client such as the iOS mail app or Fairmail. Can this be accomplished with using one of my allowed aliases? I still do not see my aliases show up as an option for the "sender" account when composing an email on iOS mail app.
Is this a possibility and I just cannot find the setting on the FAQ, or forum?
Thank you, Team.