Email error message

Detailed description: When I send or forward emails using outlook 2016 I have started getting error message - annoying thing is it does not tell me what the error is so how can I attempt to fix it?

Product & version number: Norton 360 Prem

OS details: Windows 10 19045.4894

What is the error message you are seeing?

If you have any supporting screenshots, please add them: cant add jpg file (for some reason ) as it says “sorry error uploading” so how am I supposed to tell you contents of error message - not great