A marked email is designated for special attention or later action. It serves as a visual cue, enabling users to quickly identify messages requiring follow-up. For instance, a customer complaint email might be marked to ensure a response is drafted promptly.
The practice of marking messages offers several advantages, including improved organization, enhanced task management, and reduced risk of overlooking critical communications. Historically, similar systems existed in physical offices, using color-coded paper or physical flags to highlight important documents within a filing system. The digital equivalent allows for easier sorting and prioritization in a less cumbersome format.