Subject: Mail delivery failed: returning message to sender
From: "Mail Delivery System" <[email-masked]>
To: <[email-masked]>
Date: Fri, 15 Mar 2024 00:39:53 +0330

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email-masked]
    host extmail.bpbb.bigpond.com [203.42.22.10]
    SMTP error from remote mail server after RCPT
TO:<[email-masked]>:
    550-5.1.1 [email-masked] recipient rejected. Recipient does
not
    550 5.1.1 exist. IB603A