Unable to send emails

Copper Contributor

Getting an ongoing transmission error whenever i try to send an outbound eail - message as follows :


Your message did not reach some or all of the intended recipients.

      Subject:     test

      Sent:  23/10/2021 11:17 PM


The following recipient(s) cannot be reached:


      'XXXXX@hotmail.com' on 23/10/2021 11:17 PM

            This message could not be sent. The client operation failed. Try sending the message again later, or contact your network administrator.




Diagnostic information for administrators:



Error is [0x80004005-0x00000b22-0x00000501].


would really appreciate advice on how I can address this asap





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