DMARC pct= Tag — Percentage (pct)
The DMARC pct tag applies your DMARC policy to only a percentage of failing messages. Useful for gradual rollouts — but deprecated in RFC 9091.
Importance
Optional
Optional
Tag
pct=
Default
100
100
Example
pct=100
✅ Valid Values
0–100 (integer)
💬 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 9091 (the DMARC bis standard) deprecates pct in favour of a direct policy progression (none → quarantine → reject).
📚 RFC References
🔗 Related DMARC Tags
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