Bounces
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qmail includes the following non-deliverability report (bounce) features:
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qmail-send Bounce Message Format (QSBMF) bounce messages. qmail's bounce messages are in a format that's both machine-readable and human-friendly.
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Hash Convention for Mail System Status Codes (HCMSSC) support. Bounce messages include language-independent RFC 1893 error codes.
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Double bounces sent to postmaster. Undeliverable bounce messages often indicate configuration errors, so they're delivered to the postmaster alias, by default.
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