[Exim] exim 3.34 - verify sender query /advice

Hi All

I have just added the following to our 3.34 config file as shown in the
book;

sender_verify_hosts_callback = *
sender_verify_callback_domains = *

Viewing the logs this is stopping alot of spam :-) and doing a good job,
however there are some e-mails that I want to be allowed through. Is it
possible to allow e-mails from certain @domain to bypass this even though
they are failling the verify sender???.

* Postmaster advice - Or should I go to the domains postmaster and say
that they should change there MX to except bounce messages.

Cheers

Jamie