It would be very useful, for us to have an integration that would pick up grammar and spelling mistakes and/or suggest alternative ways to phrase parts of the email based on sentiment. This would be particularly helpful for Users who suffer from dyslexia, or other similar challenges or when the User is writing the email in a language that is not their first language. I'd see this working similarly to when typing in a Word Document or in Outlook, whereat it would highlight/underline words or phrases (with colour co-ordinated indication), as to where the AI feels it is not grammatically correct or if the spelling is not correct. As for the sentiment correction, I would see this working the same except it would indicate when the sentiment appears negative, a brief description as to why and maybe a % rating for how negatively impactful the word or phrase is, for example "The word... is providing a negative sentiment - rated at 70%. Instead try...".
