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:

  crux@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<crux@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
  crumpet@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<crumpet@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
  cruno_pfrsic@hp.com
    host us-smtp-inbound-1.mimecast.com [205.139.110.141]
    SMTP error from remote mail server after RCPT TO:<cruno_pfrsic@hp.com>:
    550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [LeWwI3gBPMK71CMYQD1BRg.us434]
  cruz@futurejhb.co.za
    host fallbackmx.spamexperts.com [130.117.54.106]
    SMTP error from remote mail server after RCPT TO:<cruz@futurejhb.co.za>:
    550-5.1.1 <cruz@futurejhb.co.za>: Email address could not be found, or was
    550 misspelled (G8)
  crush2@carolina.rr.com
    host pkvw-mx.msg.pkvw.co.charter.net [47.43.26.7]
    SMTP error from remote mail server after RCPT TO:<crush2@carolina.rr.com>:
    550 5.1.1 <crush2@carolina.rr.com> recipient rejected
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:11:38 +0800
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