[Dovecot] deliver w/quotas - MDN after accept mail?

[Ken A]

I'm testing deliver with sendmail and fs quotas.
On an over quota condition, deliver accepts the mail, deletes it, then 
issues a MDN immediately.

Is there a way to get deliver to soft fail like procmail does with a 400 
error and queue the mail, then let sendmail handle the MDN, following 
it's "confTO_QUEUEWARN" and "confTO_QUEUERETURN" ?

Thanks,
Ken

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Ken Anderson
Pacific.Net