Re: Looking for Anti-spam setting: local username/external IP
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.
Re: Looking for Anti-spam setting: local username/external IP
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. --- David A. Gershman gersh...@dagertech.net http://dagertech.net/gershman/ It's all about the path! --d. gershman
Re: Looking for Anti-spam setting: local username/external IP
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...
Re: Looking for Anti-spam setting: local username/external IP
On Thursday, March 19, 2009 at 20:28 CET, David A. Gershman dagershman_...@dagertech.net wrote: I've been getting spam messages passing through my server because they are from a local user account (spoofed). However, the connection came 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. Assuming you mean envelope sender address when you say from: main.cf: smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, check_sender_access hash:/path/to/file /path/to/file: example.com REJECT -- Magnus Bäck mag...@dsek.lth.se
