Subject: Mail delivery failed: returning message to sender
From: "Mail Delivery System" <[email-masked]>
To: <[email-masked]>
Date: Fri, 15 Mar 2024 00:47:41 +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 apc.olc.protection.outlook.com [104.47.56.161]
    SMTP error from remote mail server after RCPT
TO:<[email-masked]>:
    550 5.5.0 Requested action not taken: mailbox unavailable
(S2017062302). [CO1NAM11FT063.eop-nam11.prod.protection.outlook.com
2024-03-14T21:17:39.668Z 08DC4444C9FFE09E]
  [email-masked]
    host apc.olc.protection.outlook.com [104.47.56.161]
    SMTP error from remote mail server after RCPT
TO:<[email-masked]>:
    550 5.5.0 Requested action not taken: mailbox unavailable
(S2017062302).
  [email-masked]
    host clmailrv.clearnetworks.com.au [203.168.34.140]
    SMTP error from remote mail server after RCPT
TO:<[email-masked]>:
    550 5.1.1 <[email-masked]>: Recipient address rejected:
    User unknown in virtual mailbox table
  [email-masked]
    host mx.spamexperts.com [154.59.104.23]
    SMTP error from remote mail server after RCPT
TO:<[email-masked]>:
    550 Unrouteable address