Permission: "you don't have permission to send a message to this recipient"

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Problem Type : Permissions
Problem Category : Public Folder HelpDesk

This is an Exchange issue.

You and user helpdesk staffs should have 'Send on behalf of' rights over the support e-mail account that you have specified in the PF HelpDesk Settings (Other settings tab > 'Send e-mail from' field).

Your network administrator should be able to fix that in Active Directory.
 
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