Default local email app to send invitations

Hi everybody… Just installed yesterday for the firstime… Running on Ubuntu 20.04 lts
I want to remove the unused email invitations optoins such as Google yahoo etc… Then also selecting the “default email” option dies not start my windows 10 email app but opens an url (mailto:). Should the mailto open my local default email app on my pc?
Kind Regards Thys

HI… ok i saw it only my firefox thart doies not want to start the default mail app on my PC , but which file i need to edit to removed the other invite ioptions such as google , yahoo etc so tha ti am only left with mailto: for local app please?

Kind Regards,