Originally Posted by MaxVO

I never found those emails to be helpful for ticket buyers. For example, there was a UA route I monitored, and the airline routinely dropped prices for ~4 hrs. The emails of a price drop would arrive long after the fare returned to the original level, to make it seem like the bottom was reached and it's time to buy. If you're interested in a fare, monitored it yourself. The emails are a tool for the airlines.