LPT When you open an email that will likely require a reply, or even if you're not sure - type in anything so it's shown as a draft

From personal experience - when you open an email and you start reading, going to other pages, get distracted - the browser tab may get lost in the shuffle, can be closed by mistake - and then it'll remain as Read, and you'll forget thus causing potential trouble.

Just type in "asdasd" into the reply area and leave it as is. Really useful when you get several dozen emails per day, or even fewer than that. This way you'll see the draft either way and it will stand out enough.

If you use labels - that's fine, but I don't need to in my line of work - though replies must be made and this just takes 1.5 seconds to have peace of mine.

PS: I don't overdo tabs at all. But life gets in the way, colleagues ask for help, etc