The "From" address is what your subscribers will see in their email client when they receive your messages.
If a subscriber replies to your message, it will go to this email address, so it's important to use an address you check regularly, in case a subscriber has an inquiry such as a request to unsubscribe from your list.
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Setting your From Address
In your AWeber account, select List Settings tab under List Options.
You can add and verify a new from address under the "From Name and Address" section of your basic settings.
Once these are set just scroll to the bottom of the page and click the "Save All Settings" button when you're done!