Some advanced Gmail tips to simplify work and emotional life
Managing email flow became part of workers (students, managers, even freshers) daily job. But, the email is not free - it is a hard task to read and respond to an email. see https://hbr.org/2013/04/email-is-not-free#.
In the above article, Tom Cochran identified that it cost 95 cents (of labor costs) per email. So, if you have worked on 100 emails per week, then it is $95.