Hi Philippe,
Ahh I see what you mean so when you send an email to a contact from HubSpot, it didn’t arrive in your Openxchange inbox, is that right?
What have you currently got set up between those two systems? If you could email elysha@bbdboom.com with any images or screenshots, I would be more than happy to look into this further for you.
Thanks,
Elysha Shave
Inbound Specialist