What’s the ideal suppression timing (immediate vs delayed)?
Suppression timing depends on bounce type:
Immediate suppression (hard bounces):
User does not exist: Suppress now. Domain invalid: Suppress now. Permanent rejection: Suppress now. No benefit to waiting; address is definitively invalid.
Delayed suppression (soft bounces):
Mailbox full: May clear in hours or days. Server busy: Retry likely to succeed. Greylisting: Second attempt usually works. Threshold approach protects against premature suppression.
Threshold recommendations:
3-5 consecutive soft bounces. Over 7-30 day window. Consider bounce type in threshold.
Why timing matters:
Too fast: Loses valid addresses on temporary issues. Too slow: Damages reputation by repeated failures.
Right timing balances subscriber preservation with reputation protection. Hard = immediate; soft = measured patience.
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