I'll send you an email when there's a new book coming out, and if there are ever any special offers or deals, you'll be the first to know. Sometimes you'll be the only ones to know.

My propensity for words notwithstanding, I'd rather you spent your time reading my books and not my “newsletters” or whatever, and so my emails are short and infrequent and very, very interesting.

Finally, although I do want you to buy my books, I will not send you an email every _____ days saying
“Buy My Books!”