We would like to {inform|notify|advise} you that the email you {recently|lately|just} sent to your partner was {not delivered|unable to be delivered|not received} by the customer.

This is because the sender email address you used to send that email is {not|currently not|not yet} in the list of approved addresses in your extranet's security settings.

Please note that we can only {send|deliver} messages to customers via addresses listed on our approved email address list.

How do I {add|include|insert} an address to my list of approved email addresses?