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.
(..) And when they arrived home I found them with the letters that you/they had sent that summer. And they had been returned to the addressee. Chris had made an arrangement in the mail so that they retained them up to August ro, and this way to win some time. - Do you know something about this? (..)2007 Into the Wild