I can see someone reporting this same problem in the emailgeeks slack channel:
keith kouzmanoff [11:01 AM] gmail is now giving back failure notifications for valid email addresses - oh great, thanks gmail. akshay_redac...@gmail.com,gmail-smtp-in.l.google.com *(10.10.10.1), smtp; 550 5.1.1 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=NoSuchUser4si12296857pgj.249 - gsmtp akshay_redac...@gmail.com,gmail-smtp-in.l.google.com *(10.10.10.1), smtp; 250 2.0.0 OK* 1501242044 e27si8247511qta.94 - gsmtp
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