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Exchange 2010 delivery failed

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Last Modified: 2019-12-06
Exchange 2010 local server where to look for blocked emails and resolve

We use Symantec email security which filters all our email, once in awhile it blocks an email that it should not have blocked so I log into the portal and allow it
Issue: I have one user the recipient here in our company that cannot receive from one specific user from a diff company.
everyone else here in our company can send and receive to this user just fine
Example:
anyuser@ourcompany.com can receive from userA@theothercompany.com
Excluding: userB@ourcompany.com from userA@theothercompany.com

when I look into Symantec's email security portal it shows userA@theothercompany.com cannot be delivered because sender was denied our recipient server (This is our Exchange server) where on Exchange to I resolve this?
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