[CentOS] Centos 6 Sendmail backup MX Config

[Les Mikesell]

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