We are having issues with a particular email address that is failing with the following: Rejected SPF (SPF check failed). Looking in the SMTP Log I can see that on 1/23 the email failed, but yet on 1/19 an email was received from this email address without issue.
Over the weekend we upgraded to firmware version 9.210-20 from 9.204-20
Can anyone tell me what has changed and how to correct this?
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