On Sun, 2009-03-01 at 11:47 -0800, Nifty Fedora Mitch wrote:
Depending on the complexity of the activity you may need to resort
some of the tricks used by sendmail or postfix. For example how do
you know that a data file has been processed: not at all, completely
incompletely and if it matter should it get processed twice.
Maildir uses multiple directories and links mail messages between them
because hard-linking is NFS-safe. Something along these lines might be
suitable in this case.