IMAP Extension for STATUS=SIZE, August 2018
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This document adds a new capability called "STATUS=SIZE" to the Internet Message Access Protocol (IMAP). It allows retrieving the total storage size of a mailbox with a single STATUS command rather than retrieving and summing the sizes of all individual messages in that mailbox.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.