SPF spam protection + Mail from yahoo rejected

[halliday]

Hello,
I used to receive a huge number of SPAM messages.

The problem was solved by using "Switch on SPF spam protection" and selecting:
Reject mail when SPF does not resolve to pass

The trouble is that all legitimate mail from yahoo domains have been rejected this way.

Then I tried "Reject mail when SPF resolves to "fail".
Yahoo then works but I am getting a lot of SPAM.

My question is:-
Is there a way to override "Reject mail when SPF does not resolve to pass" ?

For example by using server-wide setting like whitelisting or some "SPF local rules", "SPF guess rules" etc.

I would greatly appreciate your help.

Thank you.

David

 

[halliday]

Any chance of a response, please?

Would it be possible to specify "allow yahoo" somehow - in the SPF local rules or SPF guess rules?

If not, has anyone tried to whitelist a domain (e.g. yahoo) via the MX records?

Would greatly appreciate a response!