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postfix config

I am familiar with the order of precedence in MX records, however, the outside world will be accessing my mail gateway via the MX record. The gateway will process incoming mail for spam, then relay it to the server listed in the transport file. Now the question was and is, is it that the transport file only allows a one to one mapping (example.domain smtp: or a one to many mapping ( smtp:, or something different.... what is the syntax for allowing something other than a one to one mapping?

> -----Original Message-----
> From: Matthew Valites [mailto:mvalites at]
> Sent: Friday, December 31, 2004 03:23 PM
> To: 'Bill Holt'
> Cc: discuss at
> Subject: Re: postfix config
> Bill Holt wrote:
> >No, I don't want to duplicat it. What I'm saying is if server goes down, mail still gets to
> >Is there an order of precedence?
> >
> >  
> >
> If you just want to make sure that mail gets delivered when your primary 
> mail server goes down, you should set up the secondary server as a 
> backup MX.  It's a very simple dns change.
> ~Matt
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> Discuss mailing list
> Discuss at

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