get buried in pharmacy spam and i thought if i could get them to bounce
back as undeliverable, i might get off the rotation.
Junk email is not sent from real email addresses. They will never see the
bounce. Even if they do, they will not process it - most email marketers get
money by claiming to have lists of billions of email addresses, regardless
of whether they're real. Frequently I see non-blind-copied address lists
that contain all sorts of garbage, including Message-IDs.