Marking Emails Unread

These types of emails (with the entire email is a sentence in the subject line, with no email body, just the signature)are usually sent by a very direct person, that either feels very busy or that the problem can't be solved simply in an email, so it's too much for them to go into it all.

• Unsubscribe: from anything you don’t need, such as newsletters, groups, mailing lists, and notifications. 
• Send fewer emails: to get less email, send less. 
• Be succinct: Reply to every email in three sentences or less
• Respond with statement...

All your emails fit into one of the following 6 categories:

• Respond today: reply immediately if urgent, at the end of the workday if important
• Respond later: schedule time in the calendar in the future to reply
• Optional response: no need to respond,...