Mail delivery failed: returning message to sender

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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:

  isellisras@xsinet.co.za
    host ironport.xsinet.co.za [41.193.119.123]
    SMTP error from remote mail server after RCPT TO:<isellisras@xsinet.co.za>:
    550 5.1.1 <isellisras@xsinet.co.za>... User unknown
  isb@xsinet.co.za
    host ironport.xsinet.co.za [41.193.119.123]
    SMTP error from remote mail server after RCPT TO:<isb@xsinet.co.za>:
    550 5.1.1 <isb@xsinet.co.za>... User unknown
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:53:11 +0800
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