Peter Goerzen writes:
Greetings,I have written a patch for courier-imap that supports quota reporting (GETQUOTA only) for filesystem-based quotas, using the Linux quotactl system call. It currently works for XFS and Linux (quota v2 only) quotas.We've been running this patch in production (Debian, XFS) with about 150 users for a couple of months now with no apparent problems.
There may not be apparent problems with quota-reporting itself, but filesystem-enforced quotas are generally problematic. When a mailbox goes over its quota and the IMAP server begins reporting errors from ordinary filesystem operations, many poorly-written IMAP clients will keel over, and, pretty much, lock the user out completely.
Filesystem quotas are not recommended.
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