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How can you use this to shoot yourself in the foot and make your mail undeliverable to Goohoo! users?

- skip DKIM signature
- exclude your IP from SPF policy
- send mail where “From” doesn't match sender or DKIM domain—e.g., write to a mailing list that forwards your message—and set “p=quarantine” or “p=reject” in DMARC

You can also inundate yourself with extra mail from your recipients by adding “rua=mailto:postmaster@example.com”, because who doesn't thirst for more mail?