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How to use send-as email delegation.
When trying to send an email as a distribution list or other account you have Send-As delegate rights to you receive a Message Undeliverable Error containing the following text.
This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524].