Dovecot LMTP and Postfix MTA: Which Side Owns Quota Rejection and Subaddress Detail?
Postfix hands local mail to Dovecot through mailbox_transport=lmtp:unix:private/dovecot-lmtp , where Dovecot listens on that socket. The contract is LMTP over a socket, with no shared library or database between components. At this boundary, an unresolved decision remains: should quota rejection and subaddressing be owned by Postfix policy delegation to Dove
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