[Dovecot] Problem with dovecot configuration + mysql (I think)

[Joss Red]

Hi everybody,

I have a problem after configuring dovecot to work with mysql (Debian 
Etch System).

When i send an email from outside, i have an undelivred mail returned to 
sender saying : Relay access denied (in reply to RCPT TO command)

In my dovecot log file i have these errors :

---------------------

Nov 28 20:08:27 myhost postfix/smtpd[5087]: connect from 
smtp5-g21.toto.com [1.2.3.4]
Nov 28 20:08:27 myhost postfix/smtpd[5087]: NOQUEUE: reject: RCPT from 
smtp5-g21.toto.com [1.2.3.4]: 554 5.7.1 <mymail at test.com>: Relay access 
denied; from=<outside-mail at toto.com> to=<mymail at test.com> proto=ESMTP 
helo=<smtp5-g21.toto.com>
Nov 28 20:08:28 myhost postfix/smtpd[5087]: disconnect from 
smtp5-g21.toto.com [1.2.3.4]

----------------------

What do you think is the problem ?

Thanks,