Mail delivery failed: returning message to sender

[Singnet Mail Delivery System <noreply@singnet.com.sg>]

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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:

  iss@iss-security.co.za
    host mx1.cpmx.co.za [169.239.217.4]
    SMTP error from remote mail server after RCPT TO:<iss@iss-security.co.za>:
    550 No Such User Here
  israelp@vtrust.org.za
    host mail.vtrust.org.za [105.30.244.200]
    SMTP error from remote mail server after RCPT TO:<israelp@vtrust.org.za>:
    550 5.1.1 <israelp@vtrust.org.za> User unknown; rejecting
  israfl@zainm.com
    host mail.zainm.com [144.217.38.162]
    SMTP error from remote mail server after RCPT TO:<israfl@zainm.com>:
    550 No Such User Here
  israel@impactleaderschurch.org
    host mail.impactleaderschurch.org [197.221.14.88]
    SMTP error from remote mail server after RCPT TO:<israel@impactleaderschurch.org>:
    550 Unroutable address
  israel.moleko@zf.co.za
    host aspmx.l.google.com [74.125.24.26]
    SMTP error from remote mail server after RCPT TO:<israel.moleko@zf.co.za>:
    550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser r13si7228031pgs.395 - gsmtp
  Israel.Majola@spar.co.za
    host spar-co-za.mail.protection.outlook.com [104.47.0.36]
    SMTP error from remote mail server after RCPT TO:<Israel.Majola@spar.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [HE1EUR01FT022.eop-EUR01.prod.protection.outlook.com]
  Isqaak.Jarodien@sanlam.co.za
    host za-smtp-inbound-1.mimecast.co.za [41.74.193.201]
    SMTP error from remote mail server after RCPT TO:<Isqaak.Jarodien@sanlam.co.za>:
    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 [RPHTyZDJMXyJhiEcyspTrA.za51]
  isr@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<isr@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
  ispencer@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<ispencer@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
  ispateron@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<ispateron@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
  isono@nel.mpu.gov.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<isono@nel.mpu.gov.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
  isoldf@ananzi.com
    host guardian.brabys.co.za [196.216.215.59]
    SMTP error from remote mail server after RCPT TO:<isoldf@ananzi.com>:
    550 5.1.1 <isoldf@ananzi.com>: Recipient address rejected:
    User unknown in virtual mailbox table
  iso@act.co.za
    host 1-grid-mx01.co.za [41.185.250.70]
    SMTP error from remote mail server after RCPT TO:<iso@act.co.za>:
    554 5.7.1 Service unavailable; Client host [52.221.55.32] blocked using b.barracudacentral.org; http://www.barracudanetworks.com/reputation/?pr=1&ip=52.221.55.32
  Ismut.Paruk@vodacom.co.za
    host cluster5.eu.messagelabs.com [85.158.142.107]
    SMTP error from remote mail server after RCPT TO:<Ismut.Paruk@vodacom.co.za>:
    550 Invalid recipient <Ismut.Paruk@vodacom.co.za> (#5.1.1)
  ISN.agency@nlsa.ac.za
    host nlsa-ac-za.mail.eo.outlook.com [104.47.4.36]
    SMTP error from remote mail server after RCPT TO:<ISN.agency@nlsa.ac.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [AM5EUR02FT024.eop-EUR02.prod.protection.outlook.com]
  iso@xisnet.co.za
    host spamwall.xnet.co.za [216.55.101.101]
    SMTP error from remote mail server after RCPT TO:<iso@xisnet.co.za>:
    554 <iso@xisnet.co.za>: Relay access denied
  ismmog003@mail.uct.ac.za
    all hosts for 'mail.uct.ac.za' have been failing for a long time (and retry time not reached)

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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
To: Recipients <mauve-patches@sourceware.org>
Subject: WARM REGARDS
Date: Mon, 29 Nov 2021 14:53:21 +0800

Good Day,
 An exhaustive and meticulous search was conducted and it is in connection with this search that I'm writing to you today base on your surname which you share with a client that is now deceased. Revert back to me for more details to be given to you. 
 Sincerely,
Barr Ben Johnson