Who do I need to send product information to? [closed]

Is this sentence grammatically correct?

Who do I need to send product information to?

You can end a sentence with a preposition if you want to.

A visitor to Harvard stopped a student on the Yard and asked, "Can you tell me where the library's at?"

The student replied, "At Harvard, we do not end sentences with prepositions."

The visitor thinks a moment and rephrases his question. "Can you tell me where the library's at, asshole?"

Bryan Garner, the preeminent stylist of our times, says:

The Oxford Dictionary of American Usage and Style By Bryan A. Garner

Winston Churchill's witticism about the absurdity of this bugaboo should have laid it to rest. When someone once upbraided him for ending a sentence with a preposition, he rejoined, "That is the type of arrant pedantry up with which I shall not put."

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Churchill is a good reference, quoted by many, e.g.,:

Franklin Covey Style Guide for Business and Technical- Page 242 Stephen R. Covey, ‎Breck England - 2012 -

Winston Churchill was once corrected for ending a sentence with a preposition, and he supposedly replied, “That is the sort of English up with which I will not put.”

Further:

Law Notes for the General Practitioner - Volume 1 - Page xviii 1975

I still do not like to split the infinitive, although it is common practice these days, but I have no objection to ending a sentence with "to," nor did Winston Churchill.