Open your original sent message, and check the reason from the details in to know why the message was not delivered also check the recipient email address. Check carefully for any mistakes in the username or domain, like 'yourfriend@domain.com.' Please try sending the message again, using the correct address. If you're receiving notifications indicating temporary failure because you used the wrong domain, please note that there's no way to manually stop MDOfficeMail from trying to send the message. Generally, MDOfficeMail will try to send the message for 48 hours.