They got a lot of 'hate mail' [=extremely angry letters, e-mail, etc.] from people who disagree with their policies.
Have you 'mailed' (out) the invitations yet? [=('chiefly Brit') have you posted the invitations yet?]
She 'mailed' me a copy of her manuscript. = She 'mailed' a copy of her manuscript to me.
(..) I'd like the picture back. - Why? - I'm not happy with what I wrote. - It's good. I like it. - No, believe me, it's not good. I'll mail you one with something really funny. Well, when you mail me a new one, I'll send you back this one. You don't understand. I want the picture. (..)1992 TvShow: Seinfeld Title: The Bubble Boy Season: 4 Episode 7