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: D.Malherbe@Eskom.co.za host mx1.eskom.seagatestoragecloud.co.za [169.239.240.92] SMTP error from remote mail server after RCPT TO:: 550-Callout verification failed: 550 550 5.1.1 User unknown d.zajkowska@odnowa.opoka.org.pl host mail1.opoka.org.pl [212.91.11.72] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table d.zalucky@jacobs.com host mxa-0025cf01.gslb.pphosted.com [148.163.148.40] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 User Unknown d.yawson@cgiar.org host cluster5.us.messagelabs.com [67.219.246.211] SMTP error from remote mail server after RCPT TO:: 550 Invalid recipient (#5.1.1) d.parsonson@EZIMAIL.CO.za host mail.ezimail.co.za [197.221.12.250] SMTP error from remote mail server after RCPT TO:: 550 Unroutable address d.zagorski@worldnet.att.net host ff-ip4-mx-vip1.prodigy.net [144.160.159.21] SMTP error from remote mail server after MAIL FROM:: 553 5.3.0 flpd598 DNSBL:RBL 521< 13.251.197.89 >_is_blocked.For assistance forward this error to abuse_rbl@abuse-att.net d.roos@dacst5.pwv.gov.za host securemail-mx1.synaq.com [196.35.198.158] SMTP error from remote mail server after RCPT TO:: 550-rejected because 13.251.197.89 is in a black list at combined.abusix.dnsbl 550 https://lookup.abusix.com/search?q=13.251.197.89 d.zavala@eudoramail.com all hosts for 'eudoramail.com' have been failing for a long time (and retry time not reached) d.zal@eudoramail.com all hosts for 'eudoramail.com' have been failing for a long time (and retry time not reached) d.wholey@ifad.org host ifad-org.mail.protection.outlook.com [104.47.17.74] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB8EUR05FT026.eop-eur05.prod.protection.outlook.com] D.VANEYGEN@dirafrost.be host dirafrost-be.mail.protection.outlook.com [104.47.6.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT021.eop-EUR02.prod.protection.outlook.com] D.VANDENBORNE@dirafrost.be host dirafrost-be.mail.protection.outlook.com [104.47.6.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT021.eop-EUR02.prod.protection.outlook.com] D.OPTEIJNDE@dirafrost.be host dirafrost-be.mail.protection.outlook.com [104.47.6.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT021.eop-EUR02.prod.protection.outlook.com] d.w.jones@cryptual.com all hosts for 'cryptual.com' have been failing for a long time (and retry time not reached) d.roberts@cryptual.com all hosts for 'cryptual.com' have been failing for a long time (and retry time not reached)