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I use Mozilla Thunderbirds as my email client.
I have now deleted the spam email.
Always been OK until this morning.
Appears to be working OK
Send a test email to email@example.com from my main account, which worked OK.
Also fowarded a test email to firstname.lastname@example.org which had orginated from my partners account. That worked OK.
The orginal phishing email was sent to an alias/secondary BT account, that was the one that failled twice this morning when forwarded. Forwarded another test using that account, and it has worked OK as well..
The orginal error message was:-
Reporting-MTA: dns; sa-prd-fep-042.btmx-prd.synchronoss.net Arrival-Date: Wed, 4 Aug 2021 10:04:19 +0100 Received-From-MTA: dns; sa-prd-rgout-004.btmx-prd.synchronoss.net (10.2.38.7) Final-Recipient: RFC822; <email@example.com> Action: failed Status: 5.1.1 Remote-MTA: dns; smtpb1.bt.com (126.96.36.199) Diagnostic-Code: smtp; 550 5.5.0 550 5.7.1 Requested action not taken: message refused