David A. Gershman a écrit : > Yeah, Thought of that a little after mailing. Oh well, I guess I need > to keep my efforts in later defenses (spamassassin). > > Thanks. > >> On Thu, Mar 19, 2009 at 3:28 PM, David A. Gershman >> <dagershman_...@dagertech.net> wrote: >>> from an external source. I'm trying to see if there is a setting in >>> master.cf (or other .cf file) which will reject any email from an >>> external IP (other than my own) *and* is claiming to be from a local >>> user account. >> You'll block mail that was sent from your system, to an offsite >> forward, which then redirects back to your system again.
"unauthorized" forwarding is less common today. so you can block mail with a sender in your domain except for a list of authorized clients. That said, until now, I have never needed such control. so use zen.spamhaus.org, and let the rest go through spamassassin. only if you think a lot of junk goes to spamassassin should you think of improving your postfix defense. but then, show full headers. PS. Please do not top post. if you don't understand what this means, google...
