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A message that you sent could not be delivered to one or more of its
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  gspeladmin@giatmara.edu.my
    host ASPMX.L.GOOGLE.COM [142.251.12.26]
    SMTP error from remote mail server after RCPT TO:<gspeladmin@giatmara.edu.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 c12si25412401pjd.16 - gsmtp
  gsrealty.chua@hotmail.com
    host hotmail-com.olc.protection.outlook.com [104.47.59.161]
    SMTP error from remote mail server after pipelined end of data:
    550 5.7.1 Unfortunately, messages from [13.251.146.0] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [DM6NAM12FT031.eop-nam12.prod.protection.outlook.com]
  gsshabane@dla.gov.za
    all hosts for 'dla.gov.za' have been failing for a long time (and retry time not reached)