I also have the same problem. Was this solved for any of the above reports? I get:  Reporting-MTA: dns; rpt-glb-asav2.mgt.tpgtelecom.com.au Final-Recipient: rfc822;<destination email redacted> Action: failed Status: 5.0.0 (permanent failure) Diagnostic-Code: smtp; 5.4.7 - Delivery expired (message too old) 'timeout' (delivery attempts: 0) This seems to be happening for a number of TPG customers trying to email to any email account at the same destination domain. I have made multiple calls tom both TPG and the detination host, and no-one seems to know what the problem is. ... View more