Subject: Delivery Status Notification (Failure)
From: "Mail Delivery Subsystem" <[email-masked]>
To: <[email-masked]>
Date: Tue, 01 Jan 2019 19:58:47 -0800 (PST)

** Address not found **

Your message wasn't delivered to [email-masked] 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. Learn more at https://support.google.com/mail/?p=NoSuchUser y8sor11005017ybh.144 - gsmt