From: Oscar Zovo (zovonexus.ao)
Date: Thu Apr 13 2006 - 03:31:20 CDT

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>Hi,
>
>some of our users (a whole domain) will take their independence and are to be hosted on an external mail system.
>
>I would like :
>
>1) to send back a generic reply for each incoming message to this domain telling the sender the address is changed
>
>
If the whole domain will be moving to another server you only need to
change DNS MX records for that domain.

If the users are changing domains (i.e. user1doman1.com wil move to
user1domain2.com), you can use relocated_maps to send back the reply.
With relocated_maps the server will not accept the message but will
inform the sender that de address has moved.

>2) to redirect the incoming messages towards the new addresses
>
>How can I do ?
>
>
If you mean new server, and if you changed the MX records for that
domain, then you need this only for mail that may be sitting on queue or
incoming due to delay on DNS propagation.
You may need transport_maps in main.cf.
transport_maps = hash:/etc/postfix/transport_maps
in /etc/postfix/transport_maps have an entry like
domain1 smtp:[mailhostfor.domain1.com]

You may also need to issue postsuper -r ALL (or a queue id) for mail on
queue.

regards,
zovo.

>Thank you.
>
>Dominique
>
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