I've been seeing these messages in my email error logs lately

SQUAT failed to open index file
SQUAT failed

and being curious I looked around and found a program called "squatter" that apparently does the following :

Squatter creates a new SQUAT index for one or more IMAP mailboxes. The SQUAT index is a unified index of all of the header and body text of each message a given mailbox. This

index is used to significantly reduce IMAP SEARCH times on a mailbox.

Squatter creates an index of ALL messages in the mailbox, not just those since the last time that it was run (i.e., it does NOT do incremental updates). Any messages appended to

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