This is the mail system at host sun.supermail.co.uk.
> 
> 
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
> 
> 
> For further assistance, please send mail to postmaster.
> 
> 
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
> 
> 
>                    The mail system
> 
> 
> <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)