On Fri, Feb 13, 2015 at 12:45 PM, Valeri Galtsev <galtsev at 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. -- Les Mikesell lesmikesell at gmail.com