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: krista@myisp.co.za host mxc02.mxrc.co.za [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 kristav@armscor.co.za host mail.armscor.co.za [196.4.141.6] SMTP error from remote mail server after RCPT TO:: 550 Rule imposed as mauve-patches@sourceware.org is blacklisted on Trustwave Email IP Reputation Service - see rbladmin.trustwave.com/?ip=13.251.197.89 kristen@techmach.co.za host techmach-co-za.mail.protection.outlook.com [104.47.9.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT032.eop-EUR03.prod.protection.outlook.com] kristelle.swart@siemens.co.za all hosts for 'siemens.co.za' have been failing for a long time (and retry time not reached)