[courier-users] maildrop invalid users

[Dziugas Baltrunas]

hi everybody,   i'm using postfix with courier-imap and maildrop with userdb mechanism. is it possible to sent an e-mail for sender, if the mail was sent to local virtual non-existent user? the only way i found is to specify local_recipient_maps in postfix. but this is bad, because if user tries to send e-mail localy, from webmail (IMP), for the user in the same system, he won't get an error about undelivered letter.   regards, Dziugas