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Muchas gracias por su ayuda. Atentamente, Ana García.

Muchas gracias por su ayuda. Atentamente, Ana García.
Thank you very much for your help. Sincerely, Ana García.
From Lesson 295:Writing a formal email (estimado, atentamente)·Spanish (Spain)

Questions & Answers about Muchas gracias por su ayuda. Atentamente, Ana García.

Why do we use por instead of para after gracias?
When thanking someone, you always use por in Spanish. This is because por expresses the cause of or reason for an action—you are giving thanks because of the help. If you used para, it would sound like your gratitude is an object being delivered to the help itself!
Su can mean his, her, their, or your. How do we know which one it is here?
The formal sign-off atentamente is the biggest clue. Because this is a formal message, the writer is addressing the recipient as usted (formal "you"). The possessive adjective for usted is su, making su ayuda mean "your help" in this professional context.
Is atentamente the only way to say "Sincerely"?
It is the most common and standard sign-off for business emails and formal letters, literally meaning "attentively". Another formal option you might see is cordialmente (cordially), but atentamente is your safest bet for professional writing in Spain.
How would this sentence change if I were writing to a friend?
First, you would use the informal "your" and say tu ayuda instead of su ayuda. Second, you would drop atentamente, as it is much too formal for a friend. You would likely replace it with something casual like un abrazo (a hug) or besos (kisses).

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