I have a customer with an invalid SPF record, which (as expected) causes they messages to be rejected. As yet I've not been able to get them to fix it, so would like to have their domain white-listed from the check, but so far I've been unsuccessful in getting this configured.
I have added their domain to the following white-lists:
Approved Senders list
Approved domain to IP list
Domain to IP white-list (under the greylist/SPF heading)
I have also created a transport rule for messages from their domain that fail the SPF check to skip the anti-spam scan, but neither of these things has helped.
What should I be doing to ensure this mail is delivered, or is it simply not possible to allow for a bad SPF record?
Many thanks!
