1. A secret tip was told to me by accident.
(What does 'tip' mean here, information or advice?)
2. Mrs. Brown sent me this CD player. (Active)
3. This CD player was sent to me by Mrs. Brown.(passive)
4. I was sent this CD player by Mrs. Brown.(passive)
--------------------------------
Is #4 ungrammatical?
In 1, "tip" seems to mean "information."
2, 3 and 4 are all grammatically correct, but 4 is phrased a bit awkwardly.