If your Ribbon is in Simplified mode, (One line of icons), click "Ribbon Display Options". This is on the far right, denoted by a small dropdown arrow.
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Click "Classic Ribbon"
Change Your From Email Address
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Click "Options"
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Click "From" - This will add the field to your email header.
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In the email header, click the dropdown arrow next to "From"
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Click "Other Email Address.." This will trigger a pop up window.
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Click "From..." This will trigger another pop up window
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Scroll through the list until you find the email you need to send from.
*!*
Please note that if you have not been given permission to send from a specific inbox, your message will not be delivered. You will receive an Undeliverable Response.
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Once you have selected the email address you wish to send from, click "OK"
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Click "OK"
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Now when you click on the "From" dropdown, you will see both your email and the selected email. Feel free to switch between them.