Takes Up System Performance – For one, searching through excess emails means your Mac's local email app will usurp your macOS' memory and that can exert a negative effect on your Mac's overall performance.For instance, emails from a past coworker asking if you're available for lunch. Lack of Value Over Time – Don't be surprised to see emails in your mailbox that exhausted their use 6 years earlier.Speed of Computer Search – Okay, so machines may be faster than you, but it's still going to be quicker and more convenient for your Mac to sift through 1000 emails as against 100,000.Speed of Human Search – You're not a machine and it's going to be much easier to go through 10 emails than 100 emails, so deleting excess emails becomes a necessity.Time is of the essence and with the busy day you have ahead of you, is there time to waste on going through endless emails? Nope. Part 1: Why Should You Delete Email Account & Emails on Mac Part 5: Bonus Tips for Deleting Mail Account & Emails on Mac.Part 3: How to Delete an Outlook Email Account on Mac.Part 2: Top 2 Ways to Delete Mail Account on Mac.Part 1: Why Should You Delete Email Account & Email on Mac.