On Fri, Feb 13, 2015 at 12:45 PM, Valeri Galtsev galtsev@kicp.uchicago.edu wrote:
In this case the secondary MX has the same RBL's etc etc as the primary. I do see the spammers sending their junk to the secondary more than the primary MX. Agree the secondary does not know the difference between valid and invalid addresses.
What software the secondary MX is based on in whose case you say secondary MX doesn't know legitimate addresses of primary MX?
I know about postfix. And all my servers are based on postfix. And even in the most trivial configuration of secondary MX based on postfix secondary MX _does_ have to have all legitimate addressed of primary MX. These are in relay_recipients table. Any address that is not in that table, will not be accepted by secondary MX. Postfix even in the most trivial configuration is sane and does not "accept everything".
So, what is the secondary MX server that you are describing that "accepts everything" is based on?
I think he means that the secondary does not know the user names on the primary. Which it won't, unless someone maintains it, regardless of the server software.