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  Error SMTP (550): failed to add recipient (No such recipient here)
When you try to send an email, this error usually occurs because the email address does not exist in the remote server.
  Sep 25, 2020 6:07:00 PM      Troubleshooting, Email Assistance      smtp, roundcube, error, webmail
  Invalid request. No data was saved.
You are trying to login into Roundcube, and the following error appears.
  Jul 30, 2021 2:35:00 PM      Email Assistance      roundcube