From: Simon Matthews (simonpaxonet.com)
Date: Tue Jul 01 2003 - 15:23:09 CDT

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On Tue, 1 Jul 2003, Wietse Venema wrote:

> If it is not written in the documentation then it cannot be done.
>
> You can't assign multiple (relayhost) destinations to an address,
> for the same reason that you can't assign multiple delivery agents
> to an address.
>
> You can, however, specify a relayhost that has multiple A records;
> and the SMTP client has a fallback_relay parameter that allows you
> to specify backup relayhosts.
>
> Postfix is smart enough not to bounce mail when a relayhost is not
> found.

Wietse,

Thank you for your explanation.

Could you explain the meaning of the following in the "man smtp" file:
" When the domain or host is specified as a comma/whitespace separated
list, the SMTP client repeats the above process for all destinations until
it finds a server that responds. "

How would one provide a "comma/whitespace separated list" as the
destination?

I have also noticed that the transport map does not always override the
default message delivery method. I had a working Postfix 1.x
configuration, in which I had specified the doamins for which I wanted to
accept mail in the "mydestination" parameter and then specified that all
email for these domains should be relayed to another machine via the
transport map. This may not be the correct way to do this, but according
to the documentation on the "Mail transport switch" it should
work, and it did with Postfix 1.x.

When I upgraded to 2.x, I observed that this worked ONLY for users that
either had a local login or had a matching entry in the virtual_users
table. Removing the domains from "mydestination" and adding them to
"relay_domains" fixed the problem.

Is this a problem with the documentation, or have I mis-read it?

Simon

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