How can I setup postfix to have the FROM address in the form of a WP domain/user, instead of the /etc/hostname?
Currently gmail marks the message in original source as
mailed-by: myhostid.hostingprovider.tld (/etc/hostname)
signed-by: mydomain.tld
…and it mostly goes to spam, even for the password reset messages.
I have SPF, and DKIM set up.