troubleshooting Question

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

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ID10TzFlag for United States of America asked on
ExchangeEmail ServersEmail Protocols
3 Comments1 Solution763 ViewsLast Modified:
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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