[Exim] exim and MX records (3.36)

Hi,

I have some problem in my exim configure file. It does not use the MX
record for routing of the local_domain.
Basically what I need it to do is use route mail based on the MX records
first:
user@??? < -- the MX record for this machine points to
another MTA (MTA2)
Instead what is happening is that all mail is being routed by the
primary MTA to itself.

Thanks,

--bash