firstname.lastname issue

[Subhasha_HL]

Hi,

  I have configured postfix+cyrus-imap on fedora core 3. Everything working fine but the problem with mail box created with firstname.lastname. Mails sent to mailboxes with firstname.lastname bounces. I have attached the same.
I have added the line unixhierarchysep: yes. I cannot login using this id also. user at domain.com works fine. Any help please.

<subhasha.narayan at ecanarys.com>: host
    /var/lib/imap/socket/lmtp[/var/lib/imap/socket/lmtp] said: 550-Mailbox
    unknown.  Either there is no mailbox associated with this 550-name or you
    do not have authorization to see it. 550 5.1.1 User unknown (in reply to
    RCPT TO command)
Regards,
Subhasha H.L 
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