dovecot error

I have ispconfig2 and it works fine for all domains. An account has domain aa.com and I changed to bb.com (not delete and create new). ftp, website works fine but dovecot has a problem now. webmail cannot login and cannot receive any email. even i deleted the domain and recreate it again, all emails under bb.com cannot login. All other domain emails are ok.


here is the log if i login from webmail
Apr 4 12:09:20 server12 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown
Apr 4 12:09:20 server12 dovecot-auth: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser= rhost=::ffff:127.0.0.1
Apr 4 12:09:20 server12 dovecot-auth: pam_succeed_if(dovecot:auth): error retrieving information about user [email protected]


here is the log if i send email to bb.com
Apr 4 14:25:44 server12 postfix/smtpd[7167]: connect from mail-pw0-f45.google.com[209.85.160.45]
Apr 4 14:25:44 server12 postfix/smtpd[7167]: NOQUEUE: reject: RCPT from mail-pw0-f45.google.com[209.85.160.45]: 554 5.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail-pw0-f45.google.com>
Apr 4 14:25:44 server12 postfix/smtpd[7167]: disconnect from mail-pw0-f45.google.com[209.85.160.45]


how to fix it?

 

i mean if i use roundcube to login [email protected] is ok, but if I use [email protected], it just said login error and the log is in the above post.