I've hacked per-post AES encryption of subscriber addresses into Decorate.py so that I have a subscriber address identifier available for situations where subscribers have lost redirections in force and can't get headers to me.
Everything works, and I can use the substitution %(user_skey)s in the footer, but I get a nasty warning on the Non-digest options page, "Warning: The following illegal substitution variables were found in the msg_footer string: user_skey".
Where in the code can I list this substitution variable so that it doesn't throw this error on this page?
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