On 23/05/16 12:58, Alberto Lepe wrote:
On Mon, May 23, 2016 at 11:47 AM, Bill Cole
<postfixlists-070...@billmail.scconsult.com
<mailto:postfixlists-070...@billmail.scconsult.com>> wrote:
On 22 May 2016, at 22:31, Alberto Lepe wrote:
In my understanding, "reject_non_fqdn_sender" should have
blocked this
email as the sender's hostname is "unknown".
No. In Postfix nomenclature the "sender" is the SMTP envelope
sender address. The host offering the message is the "client".
If I understand you correctly, in this case, "sender" means
"brushfiremusic.net
<mailto:valenzuelaelvira94...@brushfiremusic.net>", right?
Almost, it is valenzuelaelvira94...@brushfiremusic.net
<mailto:valenzuelaelvira94...@brushfiremusic.net>, although you can't
validate the local part of the
sender except via a callout (which is frowned upon by many administrators).
If that is right, then why it
is not working? If I'm mistaken, then what do I need to block
mails coming
from "unknown" sources?
There are nuances her, but reject_unknown_reverse_client_hostname
is the safest choice. The other choice is
reject_unknown_client_hostname but that's MUCH riskier because it
is a stricter constraint. See the man page for postconf(5) for the
details.
Thanks! I will read more about it and try it. Thanks again!
