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A message that you sent could not be delivered to one or more of its
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  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...