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For long searches in big mailboxes, without any matches, we would previously keep working and not say anything. Clients could interpret this silence as a broken connection at some point. We now send a "we're still searching" untagged OK responses with code INPROGRESS every 10 seconds while we're still searching, to prevent the client from closing the connection. We also send how many messages we've processed, and usually also how many we need to process in grand total. Clients can use this to show a progress bar.