On Fri, 2003-09-26 at 17:09, Adam Leach wrote:
The problem appears to be due to Postfix automatically trusting machines on a local network.
My config is two networks. One setup as 10.1.1.1-10.1.1.10, and the other is the ISP/Internet. The machine that was using my email server as a mail relay was on a very close ip address, yet all tests for open relay always said my machine was secure.
However my machine was working as an Open Relay, it was not jst receiving bounces as since I've fixed the problem all email don't mention my domain or ip address, see example.
Sep 26 22:46:15 dev postfix/smtpd[27229]: reject: RCPT from cpc2-glfd2-5-0-cust26.glfd.cable.ntl.com[81.99.191.26]: 554 <brianrad91@aol.com>: Recipient address rejected: Relay access denied; from=<everetth@lowcomdata.net> to=<brianrad91@aol.com>
I have now added the following to /etc/posfix/main.cf that I think fixes the problem. mynetworks = 10.1.1.0/16, 127.0.0.0/8
At least the spammer on IP address 81.99.191.26 is getting rejected with 554 error.
I suggest checking you setup incase your machines are open as a relay to local machines.
Regards
Adam
I brought this up several weeks ago. The same thing happened to me. There needs to be some sort of patch made to postfix for this. Fine. I finally sent feedback about this. Sigh, dk