Hi @MartinMcginn,
Welcome to our Community Forums! Thank you for your first post and we're very sorry to hear that your mailbox has been hacked! We can understand how frustrating this must be for you.
Have you taken a look at our Fraud and Security page for more information about what your next steps should be? Thank you to @用心棒 for providing some great information about this issue. Please ensure that you reset your email password and amend other passwords on your device.
I'll be more than happy to look into this further for you to ensure that everything is goon on our side.
I'll send you a Private Message to confirm a few details. Please keep an eye out for a purple envelope at the top right corner of your Forum page. I'll be in touch soon.
Thank you! 🙂