Another instance where it is useful is when asking a question at a mail list but asking that anyone who answers only addresses the you not the whole email list.
Just send the email with the list in BCC, and that's gonna be automatic.
From: me
To: me
Bcc: foo-enthusiasts
Subject: [survey] what's your favorite version?
What's your favorite version of foo? Write me off-list
and I'll post back to summarize.
Imagine the maillist of all your coworkers and you want to let them know you are selling a few items. It's not rude to force responses to be only to you. This reduces the amount of email everyone gets.
Another instance where it is useful is when asking a question at a mail list but asking that anyone who answers only addresses the you not the whole email list.
Just send the email with the list in BCC, and that's gonna be automatic.