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In Postfix 2.6, milter_default_action can be set to hold, meaning if the archive server goes down, the messages will be placed indefinitely in a hold queue. Once the archiving service is restored, the administrator can intervene and process the messages in the hold queue.
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This approach involves configuring Postfix to send copies of all emails to a specific journal mailbox and then configuring Архива to retrieve emails from the mailbox using IMAP.
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