Zend certified PHP/Magento developer

Warning with NO consequences: postfix/trivial-rewrite[]: warning: relay_domains lookup failure

I get the below warning in the mail log file.

postfix/trivial-rewrite[]: warning: relay_domains lookup failure

The mail server is working well without any issues. What can this error mean?

Running the test below produces the required output.

postmap -q "example.org" mysql:/etc/postfix/mysql/relay_domains.cf

Running with verbose confirms again that the query is successful and reading the correct table

postmap -v -q "example.org" mysql:/etc/postfix/mysql/relay_domains.cf