From: matt zaglin (zagman76gmail.com)
Date: Tue Nov 28 2006 - 13:20:05 CST

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On 11/28/06, Sandy Drobic <postfix-usersjapantest.homelinux.com> wrote:
> matt zaglin wrote:
>
> >
> > the top level (domain.com in my example) does relay to our internal
> > servers, but mail.domain.com is just the fqdn of the server itself.
> >
> > I will un-define the 'mydestination' line as I have it defined.
>
> If you do not define mydestination then the default is used. This is not
> what you should do.
> Execute the following commands:
>
> postconf -e "mydestination = "
> postfix reload
>
> Verify with output of "postconf -n" that mydestination is shown as empty now.
>
> This still does not fix your problem with your relay_domains. To use
> recipient verification (Postfix will ask the backend server if that
> address is valid before accepting the mail) the backend server must be
> able to tell if a recipient is valid or not. Old Exchangeservers were not
> able to tell, so they accepted the mail and then bounced all invalid
> mails. That is bad.
>
> Sandy
> --
> List replies only please!
> Please address PMs to: news-reply2 () japantest (.) homelinux (.) com
>

I see what you are saying. I ran that command, and verified with 'postconf -n'

What syntax would I use to configure postfix to ask an exchange server
(or more specifically - multiple servers) for valid e-mail accounts -
or is that done prior, to build up your list of what addresses are
valid?

Thank you again for the help - this has been a nightmare for me the
last few days while trying to fix the system. :)

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