Thanks for getting back to me so quickly. I've tested the default joomla email and there sems to be something missing that means it won't get through to hotmail/live.com inboxes. So i'm kinda stuck because all other mail boxes are ok (gmail etc), but i know it's a joomla core issue. because i can send emails via acymailing and they reach the inbox.
Can you explain why an plugin that was in v5 did not make it to v6?