Machine mail.domain.com send email for domain.com through Postfix 2.11 but today reviewing mail.log file i noticed some Wordpress on machines wordpress.domain.com andblog.domain.com as sending email through mail.domain.com where sender address is u...@wordpress.domain.com and u...@blog.domain.com. Obviously they configured Wordpress to authenticate and send email to mail.domain.com.
The issue here is mail.domain.com is responsible of sending email for domain.com but not *.domain.com so the latter are not DKIM signed and obviously are not valid recipient addresses as those domains are not able to recieve email so i would like to reject clients using a from domain address which is not able to receive email like *.domain.com. I've been looking at the docs http://www.postfix.org/postconf.5.html but i'm unable to find a neat solution. Does anyone know how can i accomplish that?
