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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:

  degruyter@de.rhenus.com
    host mx-in3.de.rhenus.com [212.202.64.93]
    SMTP error from remote mail server after RCPT TO:<degruyter@de.rhenus.com>:
    550 #5.1.0 Address rejected.
  deidre.coetsee@dhl.com
    host mx1.dhl.iphmx.com [68.232.135.103]
    SMTP error from remote mail server after RCPT TO:<deidre.coetsee@dhl.com>:
    550 #5.1.0 Address rejected.
  default@mega3.com.my
    host sm01.small-dns.com [183.81.162.25]
    SMTP error from remote mail server after RCPT TO:<default@mega3.com.my>:
    550 <default@mega3.com.my> No such user here
  dehuaxingye@189.cn
    host mta-189.21cn.com [47.244.111.3]
    SMTP error from remote mail server after DATA:
    501 Invalid Client IP
  default@osm.org
    host a.mx.osm.org [212.110.172.32]
    SMTP error from remote mail server after RCPT TO:<default@osm.org>:
    550 Unrouteable address
  defres@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<defres@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found