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Relay access denied means that Postfix did not get proper authentication of the user attempting to send the message and that the message was for a domain other than one it receives mail for. You've got permit_mynetworks and permit_sasl_authenticated, which suggests that you were trying to send mail to a different domain via an email client on a different host. Your mymyetworks parameter looks to be configured for various versions of localhost. I would look at the postfix logs and if you think the login should have been authenticated, turn on debugging in Dovecot by switching the debug parameters to yes in the dovecot configuration.
Cincindie, that is a good observation. The logs they posted appear to indicate that dovecot is authenticating the user and resolving the credentials properly, but this is not being passed on to Postfix.