We have a domain that has been "ruined" by spammers, using it's reputation for sending spam mails.
We're moving to a different domain and would like the previous domain to become a "death trap"; marking any new mail using the domain for
bounce: as spam.
Setting up DMARC and SPF to reject all emails is easy, but how will this affect emails already received? Are DMARC records ever re-checked after already having been checked once?