Soft Bounce (Temporary Delivery Failure)
A delivery hiccup, not a dead end — the inbox exists, it just couldn’t accept the email this time.
…A soft bounce is monitored rather than acted on immediately, since the address is often still valid.…
What it means
A soft bounce is a temporary email delivery failure caused by issues like a full inbox, an oversized message, or a server timeout — the address itself is typically still valid.
Most email platforms will automatically retry sending to a soft-bounced address, and only flag it for removal if the same address soft bounces repeatedly across multiple sends.
Often resolves on its own
A retry a day or two later frequently succeeds once the inbox or server issue clears.
Worth monitoring, not panicking over
Occasional soft bounces are normal; a pattern on the same address is the real warning sign.
Distinguishes list quality from noise
Separating soft from hard bounces keeps you from removing perfectly good subscribers.
DNA's Take: We track soft bounce patterns over time rather than reacting to a single miss, so your list stays accurate without losing subscribers who just had a full inbox that day.
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