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A message that you sent could not be delivered to one or more of its
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  curns_ray@fmc.com
    host fmc-com.mail.protection.outlook.com [104.47.70.110]
    SMTP error from remote mail server after RCPT TO:<curns_ray@fmc.com>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [BN7NAM10FT037.eop-nam10.prod.protection.outlook.com]
  curlfrs@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<curlfrs@iafrica.com>:
    550 rejected because recipient verify failed -- user not found
  curl@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<curl@iafrica.com>:
    550 rejected because recipient verify failed -- user not found
  curt.leeson@pixie.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<curt.leeson@pixie.co.za>:
    550 rejected because recipient verify failed -- user not found
  curt.hucfr@dhl.com
    host mx1.dhl.iphmx.com [68.232.135.103]
    SMTP error from remote mail server after RCPT TO:<curt.hucfr@dhl.com>:
    550 #5.1.0 Address rejected.