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ssuzukiprotm@gmail.com: host gmail-smtp-in.l.google.com[2607:f8b0:400e:c08::1a] 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. For more information, go to 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser z6-20020a656646000000b006060744c5e8si12320800pgv.317 - gsmtp (in reply to RCPT TO command)