As the domain ta-publishing.co.uk is listed on this server but pointed elsewhere and the email you were sending was from the same server, it was looking to send to the domain locally first. This was causing your error.
I have adjusted the server setting here to check externally for that domain name so it can send the emails to the right server. I sent a test mail successfully so you should be able to send email correctly shortly.
Please allow a propagation time of about 4 hours, though it usually resolves faster than that.
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