update duplicate.cache only after successful delivery to maildir

hi

I am using getmail to poll a pop3 mailbox and getmail handovers mail to
maildrop


I am using the following lines in my /etc/maildroprc to
prevent duplicate mails from delivering to the users maildir

reformail -D 8192 duplicate.cache
if ( $RETURNCODE == 0 )
exit


it is working great as long as delivery to maildir is successful

but if delivery to maildir fails due to quota limit reached

then for first time the getmail polls for the message and handovers to
maildrop
    maildrop returns proper error message saying that " maildrop: maildir
over quota"
but the duplicate.cache is updated with the message-id of the mail even if
the delivery failed


so next time getmail tries to delivery the same message maildrop returns 0
due to the entry in
duplicate.cache and getmail removes the message from server and the mail is
lost


is there anyway to update duplicate.cache only on successful delivery to
the maildir


Thanks and Regards
Kamal

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