I'm planning on deleting a very old domain I never use other than quite a lot as various email addresses on websites, services, etc.:
As it is, all email sent to that domain are forwarded to my Gmail account.
Can I mark/label/filter/sort incoming mail in Gmail, so that all mail originally sent to
firstname.lastname@example.org will have some visible mark, or be sorted somehow?
Then I can see it and go to that website/service and change my email address, before I delete my domain.