David E. Wheeler writes:
On Jul 11, 2008, at 15:09, Sam Varshavchik wrote:I'm finding that, with 4.3.1-3ubuntu1~hardy1 installed, that Mail.app isn't noticing that subfolders have been updated, even though I've told it to use the IDLE command. So I'm not sure that this version has FAM compiled in.IDLE provides immediate notifications only to the folder that's currently open, and does not provides notifications of changes in any other folders.Oh. Really? That seems…pointless.
No, not really. You have a folder opened in front of you. A message gets delivered to the folder. With IDLE, your mail client gets notified immediately, and can take the appropriate action.
Mail.app does a sync with a folder whenever I hit it, so that amounts to the same thing, more or less.So I'm guessing that there's no way for a client to know that a message has been delivered to a subfolder without syncing, right?
No, not really. IMAP defines a lightweight command that returns the number of messages in some folder, not necessarily the current folder. But the mail client has to explicitly issue the command, and it's for one folder at a time. This is pretty much useless, given the demands of modern IMAP clients. But, it is technically possible for an IMAP client to quickly retrieve the number of messages in some arbitrary folder, and check if there's more or less of them.
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