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Top2. Background
The literature review permitted to find the following: (a) projects for the implementation of e-mail servers using free software, (b) partial or specific methods about the evaluation of performance of e-mail servers, and (c) methodological guides for the administration of e-mail servers using GNU / Linux and performance analysis of a particular e-mail server, which give criteria to take into account for the implementation and the security of the e-mail servers, as well as to evaluate and to analyze the performance of a particular e-mail server; but do not provide procedures that are framed into a methodology that allows to evaluate server performance or to compare both free and open with the payment licensed e-mail servers; however, the studies of Jarrín (2010), Castillo (2012), and Divja, Jagadeesan, and Sha (2016), Dong-Her, Hsiu-Sen, Chun-Yuan, and Lin (2004), Curran and Honan (2006), Méndez, Hernández, and García (2004), Awad and Elseuofi (2011), Osterman Research (2011), and Mendes (2010) served as references of previous related studies.