6.3.13.7 Article identification 
Articles are stored in the `cur/' subdirectory of each maildir.
Each article file is named like uniq:info, where uniq
contains no colons.  nnmaildir ignores, but preserves, the
:info part.  (Other maildir readers typically use this part of
the filename to store marks.)  The uniq part uniquely
identifies the article, and is used in various places in the
`.nnmaildir/' subdirectory of the maildir to store information
about the corresponding article.  The full pathname of an article is
available in the variable nnmaildir-article-file-name after you
request the article in the summary buffer.
  
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