postfix relayhost 'Recipient is not recognized. Relay access denied'

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http://serverfault.com – im trying to get webmin postfix to send emails through my smtp account with another email provider (in this case lavabit.com) im getting the error 'Recipient is not recognized. Relay access denied' which makes me think its trying to send the email to that external smtp and its rejecting it because there is no account there of that address, rather than authenticating with my account logins and sending the email through the external smtp as that account (me) my sasl_passwd file reads mail.lavabit.com [email protected]:password and my master.cf reads: # See /usr/share/postfix/main.c (HowTos)