You'll get better support I think from the mailing list set up by
debian to support their exim4 changes:
http://lists.alioth.debian.org/mailman/listinfo/pkg-exim4-users
They understand the nuances of their configuration and understand the
abilities of each mode much better than those of us who use the
standard exim configuration.
Regards... Todd
On Thu, Oct 13, 2011 at 5:17 AM, James <exim@???> wrote:
> Hi all,
>
> I'm trying to set up a Debian box to receive email for a domain
> (example.com), but send all the mail on directly to an Exchange server.
>
> [Internet] --> [Debian box] --> [Exchange server]
>
> The (only) MX record points to the Debian box. I've read everything I can
> find about Debian's 'hubbed hosts' (and the thread 'EXIM and Exchange 2007'
> from 2009 on this list) and it seems hubbed_hosts is the right way to handle
> this; I'm using the split configuration, so I've looked in
> 150_exim4-config_hubbed_hosts, I've entered the domain and the address of
> the Exchange server in hubbed_hosts, I've run 'dpkg-reconfigure
> exim4-config' and mail is (sort of) flowing the way I want it to... but
> some issues remain.
>
> 1. Using 'dpkg-reconfigure exim4-config') do I put example.com in as a
> "recipient domain for which this machine should consider itself the final
> destination" or instead as a "recipient domains for which this system will
> relay mail"? The latter seems to work but is it the right choice?
>
> 2. The default 150_exim4-config_hubbed_hosts router doesn't appear to check
> the validity of the local_part, so when I first set things going I ended up
> bouncing mail back from the Exchange box if it was addressed to
> <nobody>@example.com. Bouncing messages back from the Exchange box seems a
> Bad Idea, I'd rather not accept them on the Debian/Exim box at all, so I've
> tweaked the 150_exim4-config_hubbed_hosts router to include a local_parts
> check, as follows:
>
> local_parts = "${if exists{CONFDIR/domains/$domain}\
> {lsearch;CONFDIR/domains/$domain}\
> fail}"
>
> I then extracted all my valid email address from Exchange using an LDAP
> query, stuck the local_parts in CONFDIR/domains/example.com, and now exim
> should be able to check a valid user exists before accepting mail. This
> sort of works - mail flows ONLY if the email address is valid (i.e. the
> local part exists in CONFDIR/domains/example.com), if the email address
> ISN'T valid then I get "451 Temporary local problem - please try later"
> because "lowest numbered MX record points to local host: example.com (while
> verifying <nobody@???>". In this situation I basically expected
> Exim to say "Sorry, unknown user". Obviously I want the Debian/Exim box to
> continue to receive email (and queue it) even if the broadband link and/or
> Exchange itself go down, so I don't want Exim to be trying to call out to
> the Exchange box to verify every address, do I? Now that I have a
> local_parts check in the router should I simply disable callouts for
> recipient verification?
>
> I get the feeling I'm fighting this because I haven't quite 'got' the way
> I'm supposed to be using 'hubbed_hosts'... am I missing something?
>
> Thanks in advance...
>
> James
>
>
>
>
>
> --
> ## List details at https://lists.exim.org/mailman/listinfo/exim-users
> ## Exim details at http://www.exim.org/
> ## Please use the Wiki with this list - http://wiki.exim.org/
>
--
If Americans could eliminate sugary beverages, potatoes, white bread,
pasta, white rice and sugary snacks, we would wipe out almost all the
problems we have with weight and diabetes and other metabolic
diseases. -- Dr. Walter Willett, Harvard School of Public Health
