The letter is basically fine, Raymonde. It is a little over-formal, actually, to the extent that it has no humanity, so I have suggested a couple of personal pronouns below, a tense change, and changes in or the loss of a few words. Also, two spaces after a period is recommended: We were extremely pleased to receive your letter advising us that you would consider resubmission of our manuscript once the areas of concern highlighted by the reviewers had been satisfactorily addressed and the recommended corrections had been provided.
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