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musc.o3cminc@gmail.com: host gmail-smtp-in.l.google.com[142.250.111.27] 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 6a1803df08f44-6dccd39afb4si90067696d6.459 - gsmtp (in reply to RCPT TO command)