Tickets :: Comment on [#12447] equally adjusted folders have different behaviour when new mail arrives

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Comment	> Not to mention that ANY other process that touches an IMAP mailbox > will remove the recent flag. E.g. ingo filtering using the imap > backend. > > There is no way of reliably detecting "new" mail on a disconnected > client (even MODSEQ doesn't help us here). Unless we start doing > something like keeping track of all UIDs in the mailbox - or at least > a hash - which would become very expensive on large mailboxes.
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