Recipient address rejected: Access denied (in reply to RCPT TO command)

If I send a email to a mailbox @ on domain which is also the name by which my server is known externally (myhostname=host.dom.tld and MX record), i get this error:

The name of this server is smtps-01.local.dom.tld and the "mydestination" directive is only set to "localhost, localhost.localdomain".
I have create via ISPC C.P. the domain "host.dom.tld" and the mailbox "mailbox" still exist.
Seem a my bad configuration of some postfix parts (host 127.0.0.1 ... Recipient address rejected: Access denied).

If I send an email from localhost, the email is delivered

Someone can help me to resolve this problem

Thanks in advance
Dario

 

Where from are you sending when the email fails? And how?

 

This example I have send email from my Linux PC, from telnet on 25
This problem occur always when I send the email to this kind of recipient from any external PC or Server.

 

Start with this to get some context:
https://forum.howtoforge.com/threads/please-read-before-posting.58408/