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

Avatar of ID10Tz
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:

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There was a SMTP communication problem with the recipient's email server (my eamil server).  Please contact your system administrator. <theirdomain.com #5.5.0 smtp;550 Backend Replied [aff9cef4.0.423884.00-2094.655674.p02c11m074.mxlogic.net]: 5.7.1 Sender ID (PRA) Not Permitted (Mod>
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Also their reverse dns does not match SMTP banner, but Im inclined to believe that its our sender id blocking them.
ASKER CERTIFIED SOLUTION
isaman07

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