[exim] deliver mails for domains with local mx to first mta

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Autor: Jonas Meurer
Data:  
Para: exim-users
Asunto: [exim] deliver mails for domains with local mx to first mta
hello,

i run exim 4.34 from debian/sarge as second mta on port 26. the first
mta on the machine is courier, listening on port 25.

exim is responsible for several domains, all configured as local
domains, but there are several other domains that have the local ip as
first MX. These are the ones that courier is responsible for.

everything runs smooth currently, except for the situation, that exim
sends mail to domains that have configured a local ip as MX.

the logs in this case look for example like this:
2004-12-10 21:52:25 1Ccp9Z-0006wn-Or == jonas@??? R=dnslookup \
        defer (-1): lowest numbered MX record points to local host


i found already some information about this problem in the FAQ, and
finally got it working at least for the domain freesources.org with the
following router and transport configured:

# router for first mta
courier:
driver = accept
domains = freesources.org
transport = courier_smtp
self = send

# transport for first mta
courier_smtp:
debug_print = "T: courier_smtp for $local_part@$domain"
driver = smtp
hosts = localhost
allow_localhost

the main problem is, that the first mta is responsible for quite many
domains, and i'm not willed to configure every new one manually in a
list for my exim router.

so my intension is to configure exim to automaticly send mails to local
but not configured domains as they wheren't local, with remote_smtp.

this should result in exim sending mails to mta over tcp, according to
the MX records of a domain, both to local and remote hosts.
the only exception are domains that exim is configured to be responible
for.

any suggestions?

bye
jonas