I collected a bunch of email addresses, but they are not verified.
I now want to manually sort out obvious false ones (like email@example.com).
I'm looking for a tool / program / service that helps me (I'm aware that this can still be a lot of manual work).
Is there a tool that let me prefilter against i.e. all addresses that contains "asdf" or "test". (Tried open office calc, but not happy with the UI so far)