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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  cubcon@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cubcon@mweb.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  cuba@netactive.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cuba@netactive.co.za>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  cuan.m@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cuan.m@iafrica.com>:
    550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=52.221.55.32
  cuank@theworldofgolf.co.za
    host theworldofgolf-co-za.mail.protection.outlook.com [104.47.2.36]
    SMTP error from remote mail server after RCPT TO:<cuank@theworldofgolf.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR01FT058.eop-EUR01.prod.protection.outlook.com]
  cuawy@occn.zaq.ne.jp
    host mgw1.mx.zaq.ne.jp [175.135.253.69]
    SMTP error from remote mail server after RCPT TO:<cuawy@occn.zaq.ne.jp>:
    550 Invalid recipient: <cuawy@occn.zaq.ne.jp>
  cuahk702@occn.zaq.ne.jp
    host mgw1.mx.zaq.ne.jp [175.135.253.69]
    SMTP error from remote mail server after RCPT TO:<cuahk702@occn.zaq.ne.jp>:
    550 Invalid recipient: <cuahk702@occn.zaq.ne.jp>
  cuacx012@occn.zaq.ne.jp
    host mgw1.mx.zaq.ne.jp [175.135.253.69]
    SMTP error from remote mail server after RCPT TO:<cuacx012@occn.zaq.ne.jp>:
    550 Invalid recipient: <cuacx012@occn.zaq.ne.jp>
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:11:59 +0800
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URL: <https://sourceware.org/pipermail/mauve-patches/attachments/20211129/b3851305/attachment-0001.eml>