And other addresses work fine? Might be a setting on the mailserver or something like that don't think Contour would prevent it from being mailed...

Yeah other addresses seem to work fine.  I also know that the email account in question appears to be able to send and receive mail.  The umbraco site has also just been moved to a new server and this mail account receieved messages from contour in the past.

When moving to a new server did the smtp server also change? 

I've checked my web.config file and the settings appear to be set as the default

<system.net>

    <mailSettings>

      <smtp>

        <network host="127.0.0.1" userName="username" password="password" />

      </smtp>

    </mailSettings>

  </system.net>

I did not change these settings when the site was moved.

yeah but since it is set to 127.0.0.1 it is using the current server so moving to another server makes it use the smtp on that specific one, so it might be a setting on the new server that is causing the behavior

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