I notice I am not the only one with this issue.
My TPG email has been working fine until recently. Then Chariot told me that my legacy email address would stop working soon so I started transferring a bunch of contacts across to TPG. That's when it all fell apart. 30% (I think, it's hard to tell) of emails will not arrive. These are from places like Netconnect (which is a TPG subsidiary!) aand a whole bunch of others. The issue is that I update my address with a vendor and they send a code to confirm. I never receive the code so the update fails. Contacts that used the TPG address over the last few years have still been able to get through without a problem.
I sent an email to the TPG postmaster on 8/6 and another on 14/6 with various examples and bounce messages. I have had zero response. I did a chat with a support person and they said that the postmaster sent me an email. Clearly there is an issue because I did not receive it.
I am running out of time to get dozens of contacts updated before my Chariot and Netconnect address go away.
