Although you can create and send e-mail messages using all of Outlook’s default settings, you would be missing a lot of flexibility and convenience if you did so. The various e-mail options that Outlook offers let you use e-mail in the way that is most convenient and productive for you. These options fall into two categories: those that apply to a single message and those that apply globally. This section explains a variety of options available for individual e-mail messages that you create.
This topic is relevant only if you have two or more e-mail accounts. By default, messages are sent as follows:
Messages you create from scratch are sent using the default e-mail account.
Messages that are replies to a message you received are sent using the account through which the original message was received.
Messages you forward are sent using the account through which the original message was received.
To change the send account for a message:
Click the Account button on the Message tab of the Ribbon. A menu is displayed with the current send account checked.
Select the desired account from the menu.
By default, e-mail messages that you send are saved in the Sent Items folder. You can change this location for an individual message as follows:
Click the Save Sent Item button on the Options tab of the Ribbon.
To save the item to a folder other than the default, click Other Folder ...