Which is more correct?
"is helpful for you" or "is helpful to you"
Context: Closing line of an email. eg. "I hope this information is helpful for you."
"Helpful to you" is correct if you only mean that something is helpful to somebody. It really depends on the context.
Dictionaries give these examples:
1) helpful to do something
----It's very helpful to bring a dictionary in my English class.
2) helpful for/in doing something
----Reading a lot of books is helpful for writing your own books.
3) helpful for someone to do something
----It's helpful for me to take a bus instead of the subway.
4) helpful to someone
----The movie, "Frozen," is helpful to children because it gives true love another meaning.
I hope this will help you. Good day! :)
"To" and "for" are prepositions with "you" being the object. "To" implies something is moving toward the object, while "for" implies something benefiting the object. I think "for" is the better choice.
But, as this is a closing line of an email addressed to whoever "you" is and is written for "you", why not just close with "I hope this information is helpful", or "I hope this helps;" if you want to be less formal.