Postfix ( 127.0.0.1: address not listed for hostname localhost )

[redhatdude at bellsouth.net]

My setup is Postfix with SASL and TLS, cyrus-imapd with TLS, and  
roundcube mail.
Everything was working fine until I changed a few things trying to  
avoid becoming an open relay and also to reject as much spam as  
possible.
Now roundcube is not allowed to send mail. It was fine before. If I  
use any other Desktop client, it works fine, but not with roundcube  
mail.
How can I fix this?

The log:

Dec 12 12:37:45 imaps[12729]: login: localhost.localdomain [::1]  
theusername plaintext+TLS User logged in
Dec 12 12:37:45 postfix/smtpd[12786]: warning: 127.0.0.1: address not  
listed for hostname localhost
Dec 12 12:37:45 postfix/smtpd[12786]: connect from unknown[127.0.0.1]
Dec 12 12:37:45 postfix/smtpd[12786]: disconnect from unknown[127.0.0.1]