Although many people prefer communicating by telephone or face-to-face, personally I believe that communicating by e-mails or voice mails is better.
.... This sentence does not have any grammatical issues. However, I prefer if you introduced the topic theme to the reader and then state your opinion.
Firstly, communicating by e-mail is easy. Many people have problems with calling a person that they are not acquainted with. In this case it is not so difficult to write an e-mail or to leave a voice mail because even shy people feel themselves more confident.
... great point .... very well presented :)
Secondly, you can write an e-mail at any time of the day.Secondly, e-mail supports anybody without having any geographical or time barriers.
Seems you have really great ideas. Improve the presentation a little bit and then this would stand out other essays.