Maildir is a format for an
e-mail spool[?] that does not require
file locking[?] to maintain message integrity, because the messages are kept in separate files. It consists of a directory named
Maildir with three subdirectories,
tmp,
new, and
cur. The process that delivers mail writes it to
tmp with a filename that consists of the concatenation of the process ID, the time, and the hostname, then when it is finished moves it to
new. The process that reads mail moves messages from
new to
cur before reading them, appending a comma and flags to the filename.
Software that supports Maildir includes:
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