by selecting the message and clicking the Forward button. Tip If you click Reply, your response is sent only to the sender of the original e-mail and not to any other recipients. To respond to both the sender and all of the e-mail's recipients (such as in a team conversation where every member should be kept in the loop), click the Reply All button on the Thunderbird toolbar. In each of the cases, the powerful Compose window appears (as shown in Figure 10-6) so you can type, format, and send your message. The Compose window is organized into three primary sections to fill out before sending an e-mail, which I discuss in the following sections. I also tell you about attaching files to e-mails, spell-checking, and sending e-mails on their way. Figure 10-6: The Compose window.   The Firefox connection Thunderbird is designed to feel comfortable to Firefox users. Its interface sports a similar menu bar and theme as Firefox, and also contains a Search Box in the upper-right corner. If Firefox and Thunderbird are your computer's default browsing and e-mail programs (as I discuss at the end of this sidebar), they also work together seamlessly to provide a complete Internet experience. When you're in Firefox, you can access your Thunderbird mail quickly by choosing Tools Read Mail. You can also open an e-mail compose window (without even launching Thunderbird) by choosing Tools New Message. To provide faster access to these commands, Firefox offers a Mail button that you can add to one of your Firefox toolbars, as I discuss in Chapter 18. If you come across a link in a Thunderbird e-mail, you can click it to load the linked page in Firefox. By default, the link opens in a new tab of the last Firefox window you used, but you can configure this behavior from the Tabs category of the Firefox Options window, as I discuss in Chapter 7. Note that the Firefox mail commands and the Thunderbird launch-in-browser feature work with your computer's default e-mail and browsing programs, respectively. If they aren't already, your defaults, you can make Firefox and Thunderbird your default browsing and e-mail programs by using the General category of each application's Options window (Tools Options).   Addressing e-mails The first section you should fill out is the addressing area, where you indicate to whom the e-mail is being sent and in what way. The addressing area contains a list of rows in which you specify the addresses of the recipients. Each row that is in use begins with a drop-down list that contains the possible address types. Thunderbird supports the following forms of addressing e-mail: To: Sends e-mail directly to a recipient, who is the primary target of the e-mail. Cc: Sends a carbon copy to a recipient who might be interested in the e-mail but who is not its primary audience. Bcc: Sends a blind carbon copy to a recipient (which means that other recipients don't know that he or she is receiving it). Reply-To: Specifies the return address that recipients should use when responding to your e-mail. By default, the return address is the same address as the one you use to send the e-mail, but you might want to indicate a different one if you use multiple e-mail accounts or if the responses should go to a superior in your organization, to another e-mail member, or to some other party. Newsgroup: Specifies a newsgroup (an online forum) on which to post the e-mail message. This is an advanced feature that's beyond the scope of this chapter.