postfix problem - hostname same as external email-account (via zoho.com)
I'm running postfix on LEMP Ubunto 14.04
My webserver hostname "mysite.com" is sending emails fine internally & externally but not when I try to send it to my external email server (zoho.com) that is configured to send emails under my hostname. So my email-server (zoho.com) can send emails as "email@example.com".
When I send an email or notification from my webserver (or wordpress) to ""firstname.lastname@example.org" it throws an error "user unknown" (since it's not a system user). I tried aliases (incl. root forwarding) but those also never get delivered to my external mail server.
So actually I receive no system email at all at my external email server. What to do?