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The handling of bounced emails (Non-Delivery Reports or NDRs) is vital for list hygiene. PowerMTA v4.5 includes improved bounce classification logic. It parses failure codes more accurately, categorizing bounces into soft failures (temporary) and hard failures (permanent). This feedback loop allows upstream applications to automatically suppress invalid addresses, maintaining list health and improving future delivery rates.

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Architectural Analysis and Operational Review of PowerMTA v4.5: Enterprise Email Delivery Infrastructure The handling of bounced emails (Non-Delivery Reports or

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