Description: Be able to search for conversation that DON'T have a specific keyword or filter
Example use cases:
Search for an open email from outside your organization with 'is:open -@domain.com'
Filter out emails about "meeting" but not related to "budget"
Filtering out for emails bringing a lot of noise, like my "daily capacity report email"
Clarify context with keywords that can have different meanings, for example, searching for "apple" in the context of food and not technology, you might search "apple -iPhone -Mac"
Avoiding certain senders by searching for "invoice -[supplier's name/email]"
Excluding specific types of emails, for instance "promotion -newsletter -automated"
Have fewer results to swift through