First, it is proper Netiquette to set up folder rules for mail. Then, do keep a clean inbox. Given, must sort messages.
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In any event, there are rules. Also, inboxes include multiple folders. And so, messages go in folders. As a result, based on priority and preference. Most require some set up. Others come pre-configured.
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Free email Outlook and Google have pre-configured rules for message delivery folders. Thunderbird requires set up. It can make reading email easy. A bunch of messages in one inbox can be overwhelming.
Use folders to sift through important messages and gray mail. It follows, common technique for reaching inbox zero. Thus, incoming email is read. Next, discarded, and or responded to.
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Set up folder rules because it can help you reach inbox zero.