Advanced Email Routing - Error 550 5.1.1 Recipient address rejected

Ciao Guys,
i've setup ISPConfig 3 and Postfix and i'm struggling to have Email Routing working.

My domains are listed only in Advanced Email Routing, and this server has no other domain or mailbox locally. When i receive an email for the domain i'm trying to route, the log is the following:

Jun 8 09:29:04 XXXXXXX postfix/smtpd[18485]: connect from sv1.howtoforge.com[148.251.213.113]
Jun 8 09:29:04 XXXXXXX postfix/smtpd[18485]: NOQUEUE: filter: RCPT from sv1.howtoforge.com[148.251.213.113]: <[email protected]>: Sender address triggers FILTER amavis:[127.0.0.1]:10026; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<sv1.howtoforge.com>
Jun 8 09:29:04 XXXXXXX postfix/smtpd[18485]: NOQUEUE: filter: RCPT from sv1.howtoforge.com[148.251.213.113]: <[email protected]>: Sender address triggers FILTER amavis:[127.0.0.1]:10024; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<sv1.howtoforge.com>
Jun 8 09:29:04 XXXXXXX postfix/smtpd[18485]: NOQUEUE: reject: RCPT from sv1.howtoforge.com[148.251.213.113]: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in relay recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<sv1.howtoforge.com>
Jun 8 09:29:04 XXXXXXX postfix/smtpd[18485]: disconnect from sv1.howtoforge.com[148.251.213.113] ehlo=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=4/6

Have you any hint for me?
Thanks

 

Ciao Till,
thanks for prompt reply.

This means I've to list all mailboxes in my server. I wanna just act as antispam and forward "clean" email to the main email server.
Is it possible to have this kind of setup?
Thanks

 

Thanks, i'll configure the destination server in order to prevent the backscatter spam.
Cheers