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greg@gmail.com: host gmail-smtp-in.l.google.com[142.251.166.26] said: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser 17-20020a250b11000000b00d7dc8ddc040si1834328ybl.152 - gsmtp (in reply to RCPT TO command)