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your resume doesn't generally have an attention line your attention line would go on the cover letter.
Yes, the word "Attention" should be capitalized when appearing in an attention line in a formal letter or communication.
it is something that someone says to get your attention, in a letter!
Forget using the attention line. Just put the persons name in the first line of the delivery address.
-REFERENCE LINE
-SUBJECT LINE
-ATTENTION LINE