The only way I know this is to add .erb to your sass files so that they are processed by Rails, then you can use application level constants:
<%= APP_CONFIG[:yourkey] %>
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Encoding emails is such a disgusting task that I try to turn off all areas of higher thinking in my brain that worry about good programming principles every time I do it. If email is not a central part of this project, I would refrain from obstacles affecting the rest of your project.
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