Here are some steps you can take to ensure that your emails are sent successfully:

1. Double-check the accuracy of your recipient’s email address.
2. Verify that any ancillary attachments are in the proper format.
3. Ensure that any web links are valid and properly formatted.
4. Check the size of your email and attachments for system acceptance.
5. Allow time for delivery in accordance with sender and receiver’s mailbox alotment.