The headline mailer is a giant kludge. It needs to be
rewritten from scratch in order to be more robust, and
configurable, espically in the light of user accoutns
where many people may want things emailed to them.
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Suggest instead use phplist instead of rewriting.
There is a phplist module in the Back-End cvs already.
A PHPlist module is available for use.
RSS feeds can be setup as daily newsletters.