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.
(..) He doesn't exist, except on paper. You can't just make a person up. Sure you can, if you know how the system works. It's amazing what you can accomplish by mail. Mr. Stevens has a birth certificate... ...driver's license, Social Security. You're shitting me. If they trace any accounts, (..)1994 The Shawshank Redemption
(..) A letter a week. -They can't ignore me forever. -Sure can. But you write your letters if it makes you happy. I'll even mail them for you. How's that? So Andy started writing a letter a week... ...just like he said. And like Norton said... (..)1994 The Shawshank Redemption