Don't send email telling people that you put something in their paper
in-basket. This is a killer time-waster and rude to boot, since it assumes
that the recipient isn't going to read his or her snail mail. If you think
the paper you're sending looks so unimportant that no one will read it,
attach a paper note explaining why it is important. If it's not important,
don't send it.
An exception to this rule might occur when you know that the recipient
is a snail-mail ignorer (see below). It's also acceptable to send a short
email message alerting someone that you've sent her U.S. mail.
Try not to send a string of related messages in a row because you forgot
an important point (e.g., the time or date of a meeting), or resend the
same document several times because you corrected an error. Everyone
makes mistakes, and one of the great things about electronic communications is that they make correcting errors so simple. But remember
that it's easier on your readers (as well as making you look better) if
you get it right the first time.