Probolem with downloading mails

[Subhasha H.L]

Hi,
    I have setup cyrus-imap+postfix+saslauthd. I have POP multidrop mailbox and using fetchmail to download mails. I have a problem while downloading mails which are makred to nonexistent users( Deleted after quit the job). Mails are not downloading to existing mailbox if it has non existing users in TO are in CC. It remains in POP mailbox only. How to resolve this problem. 
 
Regards,
Subhasha H.L
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