When mailbox on Plesk server is full, email sent to the mailbox is rejected during SMTP secession without bounce message



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    the default behaviour of not bouncing mailbox full email is weird. It cause the sender to keep re-sending the emails thinking that the email hasn't received properly, which in turns stuck in the queue being deferred.

    Even google bounces mailbox full email.

    i had to disabled check-quota handler to avoid our queue being full of defered mailbox full emails.

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