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
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  da@maties.sun.ac.za
    host mail1.sun.ac.za [146.232.64.12]
    SMTP error from remote mail server after RCPT TO:<da@maties.sun.ac.za>:
    550
  da@ngkok.org
    host mx.hetemail.jp [157.7.44.163]
    SMTP error from remote mail server after RCPT TO:<da@ngkok.org>:
    554 5.7.1 <da@ngkok.org>: Relay access denied
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:12:26 +0800
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