The following errors have occurred:
The email did not send successfully.
The WordPress wp_mail function is used for sending mails but does not give any useful information when an email fails to send.
It is possible the “to” address (mdr.reda@yahoo.com) or “from” address (Hello@retailo.net) is invalid.
That should add any errors thrown when sending the email to the notice you posted above, so add that code and test another email.
Does it show any additional details?
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