Knowledgebase: Inbound Mail Flow
User email address is "marked as invalid"
Posted by Colm McGoldrick, Last modified by Taylor Stewart on 12 September 2019 01:54 PM

This article has been migrated to our Help System

Help System URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/040_usersandgroups/User_email_address_is_%22marked_as_invalid%22?mt-draft=true

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