An email bounce is a delivery failure reported back to the sending system. A hard bounce generally describes a permanent delivery problem, while a soft bounce generally describes a temporary one.[1] Neither is the same as a recipient failing to open an email that was delivered.
For a store, a mistyped address may require a different response from a temporarily full mailbox. Use the failure code and sending provider's policy to decide whether retrying is appropriate. Do not simply remove failures from reporting to improve the apparent numbers. An accepted message can still reach a spam folder, so a low bounce rate does not prove good inbox placement.
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Compiled with AI assistance using public sources. General explanation, not individual legal or tax advice. Describing a concept does not mean Zoloo offers it as a feature.