This article explores the reasons of the  students for emailing activities and how emailing activities influence the student’ writing competence. It also discusses emailing support the students  writing competence at SMA Neg 1 Sinjai. This article applied a qualitative method, covering the collection, analysis, and interpretation of comprehensive narrative and visual data in order to gain insights into a particular phenomenon of interest. The participants of this article were the second year students of SMA Negeri 1 Sinjai, consisting of 10 students chosen from two classes using purposive sampling. The data of this research were collected through observation with simple protocol. The data were analyzed using the grounded theory technique, including three types or stages of data analysis:l open coding, axial coding, and selective coding.The result of this research reveals the student’s reasons for  emailing activities, that is because it  is interesting to do, comfortable, fast, and usable to send many file. Then, raising the habit of using English language when writing in email, improves their writing competence. And the  English teacher claims that email as a learning tool is beneficial  in  increasing  the students gradesin English language subject.