We agreed the deal online, but we'll have to wait for snail mail to get the paperwork.

-There are all sorts of ways to let people know—telephone, e-mail, even snail mail.
-Thus, sending a draft to your advisor via snail mail was a painful and not very promising endeavor.
We agreed the deal online, but we'll have to wait for snail mail to get the paperwork.
.       (phải k bạn)