[Rails] Mailer failure: ArgumentError: A sender (Return-Path, Sender or From) required to send a message

What is the output when you try this:

def password_reset_instructions(user)
@user = user
p @user
@url = edit_password_reset_url(user.perishable_token)
mail(:to => user.email, :subject => 'Password Reset for
WaveLineup')
end

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