E-mails being blocked by hosts running linux with postfix
Since I ordered AppThemes themes, I've never seen the e-mails being sent from
WP with CP working. Checking with my host company, they say that something is wrong with
WP and CP. In addition, they proceed some tests with me and prove that everything is working fine. But, even showing me that is working fine,
WP with CP still don't send e-mails. They made a comment about POSTFIX and RFC 822 that prevents the return-path to be different from the sender and that's why the e-mails being are blocked by them.
Can it be verified?