In conclusion, among the three mailing systems in question, one system may have certain features over the other two, while on another feature, that system may not be any better. Therefore it is not easy to say which mailing system is the best of all three. But we can still make some comments based on the criteria needed by our client, Dimian Systems, to pick the most suitable system. Both Atis and Netscape are GUI based mailing systems that gives nice looking user interface and are more user friendly. On the other hand the ELM mailing system is text-based menu driven. Although it does not have GUI, it is useful for those users whose machines can only display text.
Between the two GUI-based mailing systems, Atis is the most powerful one and it has the most features among the three. Also, it has the best help system and context-based help. Another credit to Atis is that it can be setup very easily.
The Netscape Internet browser's mailing system, shares all the goodies of a GUI-based system. It is also regarded as the easiest to use system. Because Netscape Navigator Internet Browser has captured the majority of the market share in the Internet business and the user of the browser will likely use it's handy mailing feature, so it is reasonable to assume that the product has some longevity.
Although Elm is different from the other two in that it is a text-based system, but its use is not uncommon, especially in the UNIX environment. As mentioned before, some of the users have to have some kind of text-based system to work on because of system constraints. Other users may find it very handy to use because it can be customized to fit his/her needs to such an extent that the other two cannot compare. Elm is difficult to use for a new user because special commands have to be memorized.
Based on the result of our research on the three mailing systems together with the knowledge of our client's system capability, we would suggest Atis mailing system to be used by our client, Dimian Systems.