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:

  kathy.morftti@rcn.com
    host mx.rcn.com [69.168.97.77]
    SMTP error from remote mail server after initial connection:
    550 5.7.1 [C16] RBL Restriction:  See https://lookup.abusix.com/search?q=13.251.245.207
  kathy.king@kelston.co.za
    host pmg2.kelston.co.za [41.164.40.91]
    SMTP error from remote mail server after RCPT TO:<kathy.king@kelston.co.za>:
    550 5.7.1 Service unavailable; client [13.251.245.207] blocked using b.barracudacentral.org
  kathy.van@ntlworld.com
    host mx.tb.ukmail.iss.as9143.net [212.54.56.11]
    SMTP error from remote mail server after RCPT TO:<kathy.van@ntlworld.com>:
    550 5.1.1 MXIN501 mailbox kathy.van@ntlworld.com unknown ;id=rapem7901BaTerapfmxO18;sid=rapem7901BaTe;mta=mx7.tb;d=20211129;t=081211[CET];ipsrc=13.251.245.207;
  kathy@taxrelax.co.za
    host pse.ciphercloud.co.za [41.87.210.226]
    SMTP error from remote mail server after end of data:
    550 High probability of spam
  Kathy.Melvyn@bidports.co.za
    host bidports-co-za.mail.protection.outlook.com [104.47.9.36]
    SMTP error from remote mail server after RCPT TO:<Kathy.Melvyn@bidports.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT028.eop-EUR03.prod.protection.outlook.com]
  kathy.griffin@fnbcorporate.co.za
    host mx2.hc858-6.c3s2.iphmx.com [216.71.156.58]
    SMTP error from remote mail server after RCPT TO:<kathy.griffin@fnbcorporate.co.za>:
    550 #5.1.0 Address rejected.
  kathy.c@uniqueeng.co.za
    host protection-01.dotnetwork.co.za [154.66.66.167]
    SMTP error from remote mail server after RCPT TO:<kathy.c@uniqueeng.co.za>:
    550 5.1.1 User unknown
  kathy.ferreira@spl.co.za
    host spl-co-za.mail.protection.outlook.com [104.47.10.36]
    SMTP error from remote mail server after RCPT TO:<kathy.ferreira@spl.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT036.eop-EUR03.prod.protection.outlook.com]
  KATHY@PRISA.CO.ZA
    host mail.prisa.co.za [160.119.234.242]
    SMTP error from remote mail server after RCPT TO:<KATHY@PRISA.CO.ZA>:
    550 5.7.1 Service unavailable; client [13.251.245.207] blocked using b.barracudacentral.org
  kathy@nelsonborman.co.za
    host mx.spamexperts.com [130.117.53.188]
    SMTP error from remote mail server after end of data:
    550 Message rejected due to user rules.
  kathy@switchandsave.co.za
    host antispam.vanilla.co.za [45.221.128.186]
    SMTP error from remote mail server after RCPT TO:<kathy@switchandsave.co.za>:
    550 Relaying is not permitted
  kathy@southcor.co.za
    host mx1.mweb.net [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<kathy@southcor.co.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  kathy@kathyjames.co.za
    host securemail-mx2.synaq.com [196.35.198.158]
    SMTP error from remote mail server after RCPT TO:<kathy@kathyjames.co.za>:
    550-rejected because 13.251.245.207 is in a black list at combined.abusix.dnsbl
    550 https://lookup.abusix.com/search?q=13.251.245.207
  kathy@mobilis.co.za
    host cc9329d8.22.ik2.io [207.81.189.178]
    SMTP error from remote mail server after RCPT TO:<kathy@mobilis.co.za>:
    557 Email address - kathy@mobilis.co.za - is not available here.  Disconnecting...

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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 15:07:30 +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