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The anti-spam server receive this message when try delivery to a e-mail without mailbox size (Follow two examples):
u0E9j5K3020223 61432 Thu Jan 14 07:45 <return-a1615-21941-21964-marcos=nevesg 7BIT (Deferred: 452 <e-mail@Domain.com> Mailbox size limit ex) <firstname.lastname@example.org>
u0E9erZD006373 5590 Thu Jan 14 07:41 <bnc-16dcb460-b8ff-489e-94f7-d8e1df9dbc 7BIT (Deferred: 452 <e-mail@Domain.com> Mailbox size limit exc) <e-mail@Domain.com>
So, the anti-spam have much queue because try delivery. Can we change in smartermail to return 5XX error to sender when the mailbox size is full? Currently, the sender think the message has been delivered.