[exim] Other IP checking than SPF

     appologies that this isnt specifically Exim related, however Im having the following problem from a customer attempting to relay email via our Exim servers:
    SMTP error from remote mail server after MAIL FROM:<hello@???>
SIZE=1892:
    host mail.itcuk.net [195.226.40.68]: 550 Sorry, <hello@???> is
not allowed access from your location
thanks for any clues! Andy.From renaud/exim-users/lists.exim.org/utyaepsn@??? Mon May 12 17:12:54 2008
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Subject: Re: [exim] Other IP checking than SPF
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>     SMTP error from remote mail server after MAIL FROM:<hello@???>
> SIZE?92:
>     host mail.itcuk.net [195.226.40.68]: 550 Sorry, <hello@???> is
> not allowed access from your location

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