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A message that you sent could not be delivered to one or more of its
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  calabv@terra.com
    host vip-mail-mx-gateway.terra.com [208.84.244.39]
    SMTP error from remote mail server after RCPT TO:<calabv@terra.com>:
    550 5.1.1 5.1.1 <calabv@terra.com>: Recipient address rejected
  calama@iafrica.com
    host nav-gateway.mweb.co.za [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<calama@iafrica.com>:
    550 rejected because recipient verify failed -- user not found
  calah@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<calah@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  cal@cis.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cal@cis.co.za>:
    550 rejected because recipient verify failed -- user not found
  cakesbycarol@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cakesbycarol@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  cakes@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<cakes@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  calacs@travel-net.com
    host london.mxroute.com [185.165.242.86]
    SMTP error from remote mail server after RCPT TO:<calacs@travel-net.com>:
    550 No such recipient here