Am 22.03.2014 10:29, schrieb Pau Peris: > The issue here is mail.domain.com <http://mail.domain.com> is responsible of > sending email for domain.com > <http://domain.com> but not *.domain.com <http://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 <http://domain.com>.
please don't post in HTML, i destroys quoting in a thread and has no benefit "domains without MX records" is a bad idea, there is no RFC saying that a MX record is mandatory, that is why any MTA falls back to the A-record of the domain if there is no MX and to avoid Stan jumping out and shout "but in this decade there are no domains without MX": they exists and they are used, i learned that after a customer complaint becausem y email-verification on the webserver rejected addresses without MX not sure how it does in case if non-existing subdomains however, that should be enabled on any public MX and catchs spam http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain
