This is the mail system at host sun.supermail.co.uk.
>
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> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
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> For further assistance, please send mail to postmaster.
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> If you do so, please include this problem report. You can
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> The mail system
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> <hidden@mac.com>: host smtp-mx1.mac.com[17.148.20.64] refused to talk to
> me: 452 try later
> Reporting-MTA: dns; sun.supermail.co.uk
> X-Postfix-Queue-ID: 085125FE72B
> X-Postfix-Sender: rfc822; fay@hidden.co.uk
> Arrival-Date: Thu, 27 Mar 2008 11:15:28 +0000 (GMT)