At number 5 on my list, I have an app called ‘BlueMail‘. If you are pretty busy at the office work and if you have to mail a lot of things to a lot of people every day then this app is very suitable for you.
BlueMail comes with a very good and user-friendly interference. Therefore, it can be said that the BlueMail is pretty easy to use as well. BlueMail generally supports all email domains, and the best thing about this app is it is absolutely free, therefore, you have every reason to try it out.