That error comes from the var/log/mail.log
I have my domain added to the tables in mysql.
but my domain was listed in mydestination in /etc/postfix/main.cf.
I have it removed.
And i can't also not send mail.
If i for example send an email to my hotmail adres i get:
host mx1.hotmail.com[22.214.171.124] said: 550 OU-002
Mail rejected by Windows Live Hotmail for policy reasons. Reasons for
rejection may be related to content with spam-like characteristics or
IP/domain reputation problems. If you are not an email/network admin please
contact your E-mail/Internet Service Provider for help. Email/network
admins, please visit http://postmaster.live.com for email delivery
information and support (in reply to MAIL FROM command)