To send an email, click the New toolbar button. The New Message form, shown in Figure 19-4, opens. Here’s how you go about writing a message:
Type the email address of the recipient in the “To:” field.
If somebody is in your address book ( Section 19.6), just type the first couple letters of the name; Mail automatically completes the address. (If the first guess is wrong, just type another letter or two until Mail revises its guess.)
As in most dialog boxes, you can jump from blank to blank (from the “To:” field to the CC field, for example) by pressing the Tab key.
If you want to send this message to more than one person, separate their addresses with commas:firstname.lastname@example.org, email@example.com, firstname.lastname@example.org.