What does the symbol flag mean in my e;mall?

Question

What does the symbol flag mean in my e;mall?

Answer 1

Whoever sent it to you had it put there--to get your attention, so you'd look at the message.   kind of a "high priority" thing.

Answer 2

It is just a reminder for you that the message is important. if you click on the flag its meant to act as a reminder that the message is somehow important to you.