Emails undeliverable as appears to be spam - 554 5.7.1 message

[jenpet19]

All of a sudden I can't send emails, and keep getting the following message.  Any help would be appreciated.

Your message did not reach some or all of the intended recipients.

      Subject:    Test No 2

      Sent: 1/31/2020 1:26 PM

The following recipient(s) cannot be reached:

      '..........@tpg.com.au' on 1/31/2020 1:26 PM

            554 5.7.1 [TPG-S02] [00V2tiws012077] Message rejected as it appears to be spam. Use SMTP AUTH, PostOffice, or contact the Postmaster Team

[BasilDV]

Hi @jenpet19

Welcome to TPG Community!

We were able to locate your account using your community details and understand that you've contacted our Tech team to raise the issue.

They've refreshed the connection remotely and the outgoing should start working.

If the issue still persist, please let us know.

BasilDV