I've run into a couple of articles, including the Wikipedia article at
<https://en.wikipedia.org/wiki/Maildir> on maildirs which state that
the internal management of files in the new, tmp and cur directories is
the responsibility of the client's MUA ("When the mail user agent (MUA)
process finds messages in the new directory it moves them to cur (using
rename()"). This makes no sense. My impression has been that the
responsibility for managing the internal structures of maildirs lies
with the Mail Retrieval Agent, imapd or pop3d, on the server since the
IMAP and POP3 protocols deal with messages as entities and the storage
structure on the server is, or should be outside of MUA control.

This makes a difference here! I'm looking at customer accounts with a
substantial amount of mail in their "new" directories, and an equally
or more substantial amount in their "cur" directories. I've been
judging the date that mail was last checked by looking at the earliest
file date in the "new" directory, which generally corresponds closely
with the latest file date in the "cur" directory, so I can tell a
customer that a particular mailbox hasn't been checked since 2014, or
whenever. If management of the internal details of the maildir
structure is somehow the MUA's responsibility, then it's certainly
possible that a mailbox is in active use and is being accessed by an
ill-behaved MUA which isn't doing proper management.

Clarification?

-- 
Lindsay Haisley       | "UNIX is user-friendly, it just
FMP Computer Services |       chooses its friends."
512-259-1190          |          -- Andreas Bogk
http://www.fmp.com    |



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