feature that's beyond the scope of this book. Begin by typing the To e-mail addresses into the top row. Separate multiple e-mail addresses by using a comma (for example, bob@smith.com, emily@smith.com). If you want to specify additional types of recipients (such as Cc or Bcc), click Enter to insert a new row, and then use the drop-down list to the left of the row to specify the address type. Figure 10-6, earlier in this chapter, shows an e-mail addressed to a handful of recipients. As you enter e-mail addresses, Thunderbird makes suggestions based on your address book. In fact, if you entered the recipient's name into your address book, you can start typing that instead, and Thunderbird can still recommend the right address. You can also add recipients from your address book manually by clicking the Compose window's Contacts button to open the Contacts Sidebar (shown in Figure 10-7), then double-clicking the recipients in the sidebar list. See "Creating an Address Book" later in this chapter for more information about creating an address book. Figure 10-7: The Contacts Sidebar helps you address an e-mail quickly. Specifying an e-mail subject Sending a new e-mail to someone is like beginning a conversation. It's a good idea to use the Subject line of the e-mail to indicate what you want to talk about (for example, "This week's sales meeting"). If, on the other hand, you're responding to or forwarding an e-mail you received, Thunderbird automatically uses the original e-mail's subject line, prefixed by Re: or Fwd:, respectively. You can still change the subject line, but I recommend you stick to these tried-and-true e-mail conventions. Filling out the e-mail body You've come to the fun part: typing the e-mail itself! If you're responding to an e-mail you received, Thunderbird automatically quotes the original e-mail in the message body, and you can type your response above or even within the quoted original. Otherwise, if you're starting fresh, you have a daunting white box to fill. Don't worry - Thunderbird offers a variety of handy tools to fill that box in interesting ways. Thunderbird allows you to compose and send e-mails rich with colors, font styles, and images, much as Microsoft Word allows you to create stylized documents. These options are available on the Formatting Toolbar, as shown earlier in Figure 10-6, and might be familiar to you from other word-processing programs. REMEMBER Composing an e-mail worthy of Van Gogh doesn't necessarily mean the recipients will receive it in all its glory. Your recipients' e-mail programs must support the so-called rich e-mail format that enables colors, fonts, and images to appear. These days, it's a pretty safe bet that this will be the case. However, if you use an unusual font that a recipient doesn't have, he or she will see your text in a plain font - so it's a good idea to stick to common fonts. Attaching files If you need to send a file along with an e-mail, you can attach it, and the recipients of the e-mail can download the file to their own computers when they receive the e-mail. To attach one or more files in Thunderbird, follow these simple steps: 1. Click the Attach button on the toolbar of the Compose window. The Attach File window appears so you can find and select the files to attach. 2. Navigate to the folder containing the files to attach. 3. Select the file(s) to attach. To select more than one file, hold Ctrl (Windows) or (Mac) while clicking. To select a range of files at one time, hold Shift while clicking. Thunderbird displays the e-mail's current attachments list in a box in the corner. (This box appears only when at least one file is attached, so don't