Yes, absolutely. That's why I never fill out the To field when writing an email that I'm not sure I should send.
Without "To" field you risk to forget who you are angry at.
I type it into the top line of the email, cutting and pasting it to "To" right before I send. Helps prevents those "oops! sorry I sent you the previous email before compelting it because I accidentally hit the Send button."
I usually append an extra character to the To: email address so it bounces in case I accidentally send it