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A message that you sent could not be delivered to one or more of its
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  dwayne@telkomsa.net
    host mx2.telkomsa.net [105.187.200.241]
    SMTP error from remote mail server after initial connection:
    554 5.7.1 Try again later
  dwatermeyer@telkomsa.net
    host mx2.telkomsa.net [105.187.200.241]
    SMTP error from remote mail server after initial connection:
    554 5.7.1 Try again later
  dwallis@fnb.co.za
    host mx2.hc858-6.c3s2.iphmx.com [216.71.159.36]
    SMTP error from remote mail server after RCPT TO:<dwallis@fnb.co.za>:
    550 #5.1.0 Address rejected.