If I send to this account from a webmail program (I've tried 3 different ones)), it works. If I send a test message from Outlook it bounces or just does not arrive at all. If I use the email address to forward the email to the same address it bounces with the above message.
The other interesting thing is that it refers to "yahoo.dns" - I am on BTMail - having had major problems when my account was migrated over from Yahoo.
This must be another BT side error as some emails get through - just not all of them which is worrying.
Can one of the Moderators please put me in touch with someone who can help.