* [[Open_Terminal_as_root|Open terminal as root]], create /etc/postfix/sender_canonical file:

{{code|vi /etc/postfix/sender_canonical}}

* Create the /etc/postfix/sender_canonical, and add user -> email references like this:

{{text|root admin@yourisp.com

logwatch logwatch@yourisp.com}}

* Create /etc/postfix/sender_canonical.db file:

{{code|postmap hash:/etc/postfix/sender_canonical}}

* Add sender_canonical variable to /etc/postfix/main.cf:

{{code|postconf -e "sender_canonical_maps<nowiki>=</nowiki>hash:/etc/postfix/sender_canonical"}}

* Restart postfix:

{{code|systemctl restart postfix.service}}