@LilithElina SimpleLogin has an experimental option for transforming replays with your alias email address.

Never used it.

»Reverse Alias Replacement … Experimental

When replying to a forwarded email, the reverse-alias can be automatically included in the attached message by your email client. If this option is enabled, SimpleLogin will try to replace the reverse-alias by your contact email.«

https://app.simplelogin.io/dashboard/setting