"Uncaught ReferenceError: Invalid left-hand side in assignment"
BTW: I would put the extension to the "code snippets" section and describe the functionality a little bit more. Otherwise others might not recognize this great extension.
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Because rsmail differs between lists, templates and newsletter, it is was flexible enough.
"Clean and Lean" is maybe the right description. Even if it is a 1.0 version there are very few things i would like to improve.