** Address not found **

Your message wasn't delivered to juanvasquez@unal.edu.co because the address couldn't be found, or is unable to receive mail.

Learn more here: https://support.google.com/mail/?p=NoSuchUser

The response was:

The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces. For more information, go to https://support.google.com/mail/?p=NoSuchUser