She’s the Grinch of Christmas mail.

A Long Island worker snatched over 20 gift cards from her Long Island post office that were meant to be shipped out over the holiday season — and used them to treat herself, authorities alleged Friday.

Jovanni Jamison-Lewis, 35, was caught on-camera systematically riffling through packages dropped off at the Oakdale post office to be mailed, according to the Suffolk County District Attorney’s Office.

She allegedly stole any envelope that contained gift cards — and was discovered using some of them at various stores later, prosecutors said.

Suffolk DA Ray Tierney announced Friday that Jovanni Jamison-Lewis, 35, was caught on-camera stealing mail. Stephen Yang for the NY Post

Authorities were tipped off to the alleged scheme in September after the po

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