Preferences - Composing Messages
When you click on the Composing Messages tab, you will access the page in which you can adjust the settings for composing a new email. You can choose whether emails that you compose automatically appear in a new window, whether they include HTML, and whether unsent messages are automatically saved as drafts. You can also request return receipts, request delivery status notifications, automatically have replies placed in the folder of the messages being replied to, and choose whether the reply appears above or below the original message. Additionally, this page has settings for forwarding messages, the default font, and the default action for the Reply All button.
Signature Options on this page allow you to choose when your signature is added to an email, as well as whether the signature is removed from the original message.
Spellcheck options include the ability to have your spelling automatically checked before you send a message and to ignore words with symbols, numbers, or all letters capitalized.