This message was created automatically by mail delivery software. 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: 541ea8c0@saasta.ac.za host mail.saasta.ac.za [196.21.206.98] SMTP error from remote mail server after RCPT TO:<541ea8c0@saasta.ac.za>: 550 5.1.1 <541ea8c0@saasta.ac.za>: Recipient address rejected: User unknown in local recipient table 525262174@tuks.co.za host aspmx.l.google.com [74.125.200.26] SMTP error from remote mail server after RCPT TO:<525262174@tuks.co.za>: 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. 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AS(201806281) 465@gmail.com host gmail-smtp-in.l.google.com [74.125.130.27] SMTP error from remote mail server after RCPT TO:<465@gmail.com>: 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 b9si21264883pfv.10 - gsmtp