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A message that you sent could not be delivered to one or more of its
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  howard@piecity.net
    host mail.piecity.net [196.22.132.166]
    SMTP error from remote mail server after RCPT TO:<howard@piecity.net>:
    550 Unroutable address
  HOWARD@owls.co.za
    host mx1.tld-mx.com [169.239.217.4]
    SMTP error from remote mail server after end of data:
    550 High probability of spam
  Howard@fcbct.co.za
    host fcbct-co-za.mail.protection.outlook.com [104.47.6.36]
    SMTP error from remote mail server after RCPT TO:<Howard@fcbct.co.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT004.eop-EUR02.prod.protection.outlook.com]
  howard@chester.com.my
    host aspmx.l.google.com [74.125.24.26]
    SMTP error from remote mail server after RCPT TO:<howard@chester.com.my>:
    550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser k1si16796781pfu.102 - gsmtp