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Plesk Mailbox Size

There is a 10% grace limit, which does include as well, that the last eMail still might go over the grace limit, because of it's complete size ( incuding attachments ), because attachments as well have a 10% grace limit itself. If the last eMail did reach the limits then no further eMails should get through the limiter.
 
I never searched for manual instructions about a grace limit, but the standard postfix or dovecot configurations mostly include a definition like "quota_grace = 10 %" - and other definitions depending on that. Be aware that Plesk seems to manage mailbox quota with his own "check-quota filter" ( /opt/psa/handlers/hooks/check-quota - on Ubuntu 12 ).
 
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