I'd avoid Spark due to privacy concerns. You can't turn off their 'collaboration features' so that they don't collect any data [0]https://sparkmailapp.com/priv

I'd avoid Spark due to privacy concerns. You can't turn off their 'collaboration features' so that they don't collect any data [0]https://sparkmailapp.com/privacy#privacy_2 https://sparkmailapp.com/privacy#privacy_2