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: donaldson@nbict.nbi.ac.za host mail1.imcf.co.za [196.31.215.9] SMTP error from remote mail server after RCPT TO:: 554 5.7.1 Service unavailable; Client host [52.221.55.32] blocked using sip.invaluement.local; Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32 donald.ramprora@lepelle-nkumpi.gov.za host securemail-mx2.synaq.com [196.35.198.158] SMTP error from remote mail server after RCPT TO:: 550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl 550 https://lookup.abusix.com/search?q=52.221.55.32 Donald.Joseph@transnet.net host za-smtp-inbound-1.mimecast.co.za [41.74.193.210] SMTP error from remote mail server after RCPT TO:: 550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [tHSFYsYwMA6hU4EYeYWfig.za103] donaldf@vdt.co.za host za-smtp-inbound-2.mimecast.co.za [41.74.197.201] SMTP error from remote mail server after RCPT TO:: 550 sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=52.221.55.32. - https://community.mimecast.com/docs/DOC-1369#550 [DmCkMv5fOXCVYAlOHwj6SQ.za90] donaldf@tshwane.gov.za host securemail-mx1.synaq.com [196.35.198.158] SMTP error from remote mail server after RCPT TO:: 550-rejected because 52.221.55.32 is in a black list at combined.abusix.dnsbl 550 https://lookup.abusix.com/search?q=52.221.55.32 donaldcowfn@mac.com host mx01.mail.icloud.com [17.56.9.17] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : user does not exist donald.scott@za.ey.com host mx1.hc413-60.ap.iphmx.com [139.138.43.230] SMTP error from remote mail server after initial connection: 554-esa.hc413-60.ap.iphmx.com 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.