On Fri, 2009-07-31 at 18:56 +0200, Thomas Hummel wrote: > On Fri, Jul 31, 2009 at 12:49:04PM -0400, Timo Sirainen wrote: > > > Most clients cache mails based on UIDVALIDITY and UID, so if UIDVALIDITY > > changes, it re-downloads all mails. If just UIDs change, then it's > > handled exactly the same way as if all messages just got expunged and > > added back, so again it'll re-download them. > > You mean, one single UID differ between the client's cache and what the server > sends and the whole mailbox is fetched again ?
No. But if if you delete uidlist, all UIDs change. There are very few situations where only a single UID differs. Then again, client doesn't know if UID changes. It handles those situations exactly the same way as if message was expunged and a new message was added. > So UIDVALIDITY is just basically the "instance number" of a mailbox, right ? Pretty much, yes.
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