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John AchilleFlag for United States of America

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how do I allow email to be delivered when to our domain when the end user is receiving 5.7.1 Sender ID (PRA) Not Permitted

recently due to a hack we increased security by toughening up our sender id and spf records.
After doing this some emails from trusted clients started to receive the following errors:

There was a SMTP communication problem with the recipient's email server (my eamil server).  Please contact your system administrator. < #5.5.0 smtp;550 Backend Replied []: 5.7.1 Sender ID (PRA) Not Permitted (Mod>
Also their reverse dns does not match SMTP banner, but Im inclined to believe that its our sender id blocking them.
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will changing the filter to accept also allow the possibility of domain spoofing to take place? I dont want to loosen security to allow one person to send email.
I guess you have a third option which is to Archive, so it neither rejects not allows to go through. It will put it in a special folder, where you can choose which one to release and which one to delete.