What am I looking at from hosting point of view?

Guys,

Need advice of those who have programming understanding. I have an idea of launching a free service that filters people's e-mail accounts from spam based on most popular filters.

What am I looking at from hosting-needs points of view? What will I need technically to implement? How much could it cost? How much bandwidth could it consume?

Thank you.

 

 

 

 

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