DMARC pct= Tag: Percentage (pct)
The DMARC pct tag applies your policy to only a percentage of failing messages. Removed in RFC 9989 (DMARCbis). Use the t= testing mode tag for staged rollouts instead.
Optional
pct=
100
pct=100
t=y testing-mode tag instead. More on DMARCbis → ✅ Valid Values
💬 What This Tag Does
The "pct" tag applies your DMARC policy to only the specified percentage of messages that fail DMARC checks. For example, "pct=25" with "p=quarantine" means only 25% of failing messages are quarantined; the rest are treated as if the policy were "none". This was designed for gradual DMARC rollout, but RFC 9989 (DMARCbis) formally removes pct= from the specification in favour of the new t= testing mode tag. Existing records with pct= will continue to function at receivers that support it, but new records should use t=y for staged testing instead.
📚 RFC References
🔗 Related DMARC Tags
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