All Mailings have a details section pictured below:

All options in this section are required.
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Save As: The mailing name, this will be visible in the list of Mailings in your account.
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Subject: Mailing subject.
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From Name: The friendly alias of your e-mail address, i.e. 'Customer Service', 'Newsletters'.
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From Email Address: The address responsible for the mailing.
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Reply-To Email Address: The address to which responses should be directed.
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Footer Address: Select from different compliance addresses if you're managing multiple brands in your account.