Random email delivery failures

[jonesty]

Lately I've been having trouble with emails randomly failing to be delivered from my TPG email address. I raised this with TPG customer service recently and was told it was a problem on the recipients' end but that seems unlikely as it's now happened for multiple recipients on different domains. I can email the same person several times and it might fail just once. The worst part is I don't receive the failure notificiation until the next day so I never know what's gone through. Below are the latest 3 delivery failure notices I've received. Any ideas what's going on here?

Reporting-MTA: dns; rpt-glb-asav6.external.tpg.com.au

Final-Recipient: rfc822;***@eq.edu.au
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [60.241.0.50]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'#5.1.0 Address rejected.' (delivery attempts: 25)

Reporting-MTA: dns; rpt-glb-asav6.external.tpg.com.au

Final-Recipient: rfc822;***@conductorhub.com.au
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [60.241.0.50]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'#5.1.0 Address rejected.' (delivery attempts: 34)

Reporting-MTA: dns; rpt-glb-asav6.external.tpg.com.au

Final-Recipient: rfc822;***@diyframelessglass.com.au
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [60.241.0.14]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 553-'Envelope sender <***@tpg.com.au> rejected' (delivery attempts: 30)

[BasilDV]

Hi @jonesty 

Are you using an email client? Or webmail?

Are you using computers or tablet or phone to send the email?

[jonesty]

Hi @BasilDV,

I'm using Outlook on a PC but I've never had an issue before, this has just started recently. There seems to be other Community users reporting the same problem/s this week.

For reference:

Infuriating email failure 

Envelope sender rejected 

[alanguide]

Basil, this is exactly the same problem that I and many others have been having. Mine on Outlook and not with every outgoing email, but enough to be extremly inconvenient. It's a new problem not had for years of good service from TPG. Definitely not at the receiving end.

[BasilDV]

Hi,

Do you still experiencing the outgoing failure?

Can you try the webmail if the same issue will occur?