Re: I was passed a salt by him.
The salt, the book, and the e-mail are the direct objects, while "me" "her" "Tom" and "me" are the indirect objects.
"Pure" passive transformation would have salt, book, water, letter, and e-mail as the subjects.
You should NOT have the confidence to say "I was read the book" is an appropriate trasnformation to the passive.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.