This is the best mailing app I had ever seen. Everything is at the level of perfection. No drawbacks, no limitations, just install it, oh sorry no need to install it is given pre-installed.
It is effortless and the most user-friendly mailing app. I compared my experience of yahoo mail and Gmail and found a lot of difference. Yahoo is quite complex and some slow. On the other hands, there are no limitations with Gmail.
You should give it a check.