Consider your state of mind
If you are in a bad mood or have any other feelings that may reflect on the style of your writing, before sending your message (with virtually no chance of retrieving it).
Read receipt or delivery receipt notifications
You can use the “read receipt” or “delivery receipt” notification function in Microsoft Outlook to notify you of when the email has been received or read. Be careful when using this function, the person receiving the email also sees the notification and may not appreciate the use of this feature.