11/29/2023 0 Comments Configurando outlook express 6![]() Whatever is the reason for the error 550, I would recommend you to repair and fix it quickly to avoid future hindrance. So if you want to fix this error have to authenticate your email client. The SMTP servers are configured for authentication to outgoing emails. What this error represents is that your SMTP server was not able to deliver your send email. “550 Requested action not taken: mailbox unavailable” ![]() When you attempt to send emails through Microsoft Outlook or Outlook Express, the mail encounter a send error and the mail will return with a 550 error message stating as
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