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: heidi@ubuntuhygiene.co.za host mx1.tld-mx.com [169.239.219.2] SMTP error from remote mail server after end of data: 550 High probability of spam HEIDI.SCHUTTer@mrc.ac.za 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 [iIl6eX0NOuSva0eeA7GbTA.za97] heidi@autocity.co.za host mail.autocity.co.za [196.22.142.153] SMTP error from remote mail server after RCPT TO:: 550 Unroutable address heidi.van.cyk@flender.co.za host relay1.netnames.net [185.26.230.83] SMTP error from remote mail server after RCPT TO:: 550 We don't handle mail for flender.co.za Heidi.Poplett@sanbs.org.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 [nRie0YL5MvyBBzu6MpLrZQ.za46] Heidi.Ludeman@Officeplant.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 [nRie0YL5MvyBBzu6MpLrZQ.za46] heidelisej@seekers.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 [nRie0YL5MvyBBzu6MpLrZQ.za46] heidi@agrmduk.ecape.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 heidi@cpt.co.za host cpt-co-za.mail.protection.outlook.com [104.47.10.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT027.eop-EUR03.prod.protection.outlook.com] heideman@maths.uct.ac.za all hosts for 'maths.uct.ac.za' have been failing for a long time (and retry time not reached)