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<ul>
<li>appending: it's important that the index records for individual
messages make it to disk before the index header indicating that
they're there. so something like:
<ol>
<li>sync messages to disk (or depend on <tt>link()</tt> being atomic)
<li>create new index records, flush to disk
<li>create new header if necessary (adding new user flag), flush to disk
<li>flush cache file
<li>update index header, flush to disk
</ol>
</li>
</ul>
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