SMTP 550 No Such User

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The SMTP 550 error can happen when a SMTP server rejects email sent to an email address that does not exist.

Example of Error Response:
Final-Recipient: rfc822; <***@gmail.com> Action: failed Status: 5.0.0 550_5.1.1_No_such_user_e11si1043640qbc Diagnostic-Code: smtp; Permanent Failure: Other undefined Status Last-Attempt-Date: Thu, 17 Aug 2006 12:04:08 -0000

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