6.3.13.8 NOV data 
An article identified by uniq has its NOV data (used to
generate lines in the summary buffer) stored in
.nnmaildir/nov/uniq.  There is no
nnmaildir-generate-nov-databases function.  (There isn't much
need for it--an article's NOV data is updated automatically when the
article or nnmail-extra-headers has changed.)  You can force
nnmaildir to regenerate the NOV data for a single article simply by
deleting the corresponding NOV file, but beware: this will also
cause nnmaildir to assign a new article number for this article, which
may cause trouble with seen marks, the Agent, and the cache.
  
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