I am not sure what you meant. Anyways I dont think I am qualified enough to answer that one either.
The framework for email and nearly everything else that works over the internet is standard. So any system that'd involve sending emails would essentially be just piggybacking on it.
However if its a website that you are talking about, then sure, go ahead. But better use the web-languages like html/php, javascript etc.
Or if you are thinking of creating a software at the user-end (think of the dropbox app on android) then I think pretty much any standard programming language will let you do that, including java.
However, wait for other, more knowledgeable people to comment on this.