Also means
sincerely yours
Usage Note
Atentamente serves two distinct functions: as an adverb meaning 'attentively' or 'carefully', and as the standard formal valediction in Spanish correspondence, equivalent to 'Yours sincerely' or 'Kind regards'. The letter-closing use is so prevalent that it can feel overly stiff in informal emails; un saludo or saludos is more relaxed.
Examples
"Le saluda atentamente, el director."
Natural Translation
Yours sincerely, the director.

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