If what Mac has posted is correct then your issue is solved. If you only have 1 account set up then you might also want to disable your Anti Virus integration (email scanning)
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Peter
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"Steph" <Steph.DeleteThis@discussions.microsoft.com> wrote in message news:BBC69297-07EE-484B-94C2-3F7A3B818CD5@microsoft.com...
>I notice that each time I send an e-mail to an existing contact, the e-mail
> is going twice. The address of the person appears as John Doe
> <john.doe@...>. Is there a way to stop the message being sent more than once
> to the same contact?