From: Wietse Venema (wietseporcupine.org)
Date: Tue Apr 01 2008 - 07:44:55 CDT

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mouss:
[ Charset ISO-8859-1 unsupported, converting... ]
> ramesh srinivas wrote:
> > Hi,
> >
> > Recently i have configured backup Mail server. tested
> > by disconnecting primary mail server, mails are qued
> > in backup mail server, so its working fine.
> >
> > Invalid mails which are rejected by primary mail
> > server are queuing in backup mail server, backup mail
> > server pushes to primary mail server.
> >
> > How to discard this invalid mails from secondary mail
> > server queue. ( i have entered valid mail id in access
> > file, still im finding lot of invalid mails in queue).
> >
> > Any suggestion to fix this issue is appreciable.
> >
> >
>
> You must validate recipients on the backup server (either copy the list
> of users or use sql/ldap to access this list).
>
> If you can't, then remove the backup server. discarding mail is not
> acceptable (bouncing is worst). People do mistype addresses sometimes.

See: "Configuring Postfix as primary or backup MX host for a remote site:
http://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup

        Wietse

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