10.16. Email returns - This message could not be sent

Condition: When sending an email with the Email with Regular Attachment tool the tool will indicate that the email sent. Shortly there after an email notification is received that says:

"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]."

Solution: In the Emailer tool empty the "From Address" field and try again.