I won't bore people with the nitty gritty of this domain story, but the central issue is a dispute about whether or not the other party sent commercially critical emails ata particular point during negotiations. They say they did send. When asked to provide copies of these emails they claim to have already deleted them from their email client and that their archive has been purged. They also claim that the emails were not returned 'undelivered'. Interestingly only the critical emails did not arrive, whilst all the inconsequential ones did. What to do? I'm not an expert on email. Does anyone know if there is a technical way to find out categorically whether their claim is true? To be clear, I'm absolutely confident that they neither composed nor send the emails. How to expose their deceit? Any suggestions gratefully received. Cheers.