If you send those details right away, It will be useful for me.
Please review it and let me know.
The most obvious problem is the incorrect capital of "It". Other than that, the sentence is passable but not especially polished. You could consider this instead: It would be useful for me if you could send those details right away.
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The most obvious problem is the incorrect capital of "It". Other than that, the sentence is passable but not especially polished. You could consider this instead:
It would be useful for me if you could send those details right away.