to send mail as any address (that you own), you log in to your gmail account, click on settings. There will be a tab that says Accounts. There is a section that says Send Mail As. Click Add Another Email Address.
Once you add another one, there will be a drop down menu when you are composing new mail. Its pretty handy. So if I need to send business mail, I just choose from the drop down. If its personal, I use my base gmail address.
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