invalid email

Invalid emails that are undeliverable, is there a way to flag them without deleting them from the database? That way if the same invalid emails come up through an other email list, they won’t get into the queue again and waste resources.

Invalid emails that are undeliverable, is there a way to flag them without deleting them from the database? That way if the same invalid emails come up through an other email list, they won’t get into the queue again and waste resources.