It's an interesting idea. search_getting_ids is defined in library/caches.py
In general when looking for a function definition in python code, I use the following simple grep expression
grep -r "def function_name" src/calibre/*
The email code is in calibre.utils.smtp
And you've already discovered the server code
My only caveat is that you should have the list of email addresses hidden behind a generic "email" link so as not to clutter up the listing. Since the server has jquery available it should be easy to expose the list of addresses when the link is clicked.
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