DMARC quarantine tells receivers to treat failing mail as suspicious, often sending it to spam. Learn when to use quarantine and how to roll it out safely.
In DMARC, “quarantine” is a policy instruction that tells receiving providers to treat messages that fail DMARC as suspicious. In practice, this often means placing the message in spam or a junk folder rather than delivering it normally.
Quarantine is commonly used as a middle step between monitoring (p=none) and strict blocking (p=reject). It helps protect a domain from spoofing while giving senders time to fix legitimate sources that may still be misaligned.
Rolling out quarantine safely requires visibility. Use DMARC reporting, confirm all legitimate senders pass alignment, and consider using percentage rollout (pct) before enforcing quarantine fully.