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: andrewmathibla@up.ac.za host aspmx.l.google.com [142.251.10.27] SMTP error from remote mail server after RCPT TO:: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser p19si11016905plc.199 - gsmtp ANDREWCLARK@cybersmart.co.za host mail1.mx.cybersmart.co.za [196.41.124.80] SMTP error from remote mail server after RCPT TO:: 550-5.7.1 : Recipient address rejected: 550 Access denied andrewegreen@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found andrewdeacon@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found andrewchristie@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found andrewcharl@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found andrewandwin@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found andrewcarle@ananzi.co.za host mx.cloudafrica.email [41.79.76.130] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: undeliverable address: host 10.0.35.24[10.0.35.24] said: 550 Rejected - Invalid recipient address (in reply to RCPT TO command) ANDREWINSCOTLAND@BLUEYONDER.CO.UK host mx.tb.ukmail.iss.as9143.net [212.54.56.11] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 MXIN501 mailbox andrewinscotland@blueyonder.co.uk unknown ;id=rZaPm7NXiJNobrZaQmPpKP;sid=rZaPm7NXiJNob;mta=mx6.tb;d=20211129;t=065222[CET];ipsrc=13.251.146.0; andrewb@gecko.biol.wits.ac.za all hosts for 'gecko.biol.wits.ac.za' have been failing for a long time (and retry time not reached)