[Exim] exim checking wrong received: line

hi,

i'm using DNSBL lists with Exim 3.35. Occasionally, (for some reason or
another) mail can't get to our primary MX, so is queued at the secondary.
The problem with this is that when it is finally delivered to the primary,
spam by-passes the RBL check (as the server the mail is coming from will be
our secondary). Are there any known ways around this?


cheers, Michael