[Vmail-discuss] Exim as Secondary MX

[Pat Crean]

On Wednesday 11 June 2003 11:04, Jose de Paula Eufrasio Junior wrote:
> Hello.
>
> I was thinking in changing some MX here to use the vmail machine as
> secondary.
>
> What should I do? Just put the domains that I want in the relay_domains
> and not in the localdomains?
>
> Any help is welcome ! :)
>
> []s
> coredump


The easiest way to handle it is to set "relay_domains_include_local_mx = yes".  
That way you just have to create a low priority mx record pointing to your 
vmail machine and everything else happens automagically.  You do open 
yourself up to a potential spam attack in that a spammer could, 
theoretically, set up a dns server containing an mx record pointing to you 
and then use you as an open relay.  Not too big a problem, though as most 
spammers aren't going to go to that extreme when there are so many open 
relays available in china....