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  irshad@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<irshad@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  ironwave@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<ironwave@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  irvin.pillay@xps.cfgrp.co.za
    host in.hes.trendmicro.eu [52.58.62.239]
    SMTP error from remote mail server after RCPT TO:<irvin.pillay@xps.cfgrp.co.za>:
    554 5.7.1 <irvin.pillay@xps.cfgrp.co.za>: Recipient address rejected:
    NO-DOMAIN.
  ironside@cs.sun.ac.za
    host cs-sun-ac-za.mail.protection.outlook.com [104.47.9.36]
    SMTP error from remote mail server after RCPT TO:<ironside@cs.sun.ac.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT043.eop-EUR03.prod.protection.outlook.com]