All I have to go on is the RFC2060 standard which says: 7.3.1. EXISTS Response
Contents: none
The EXISTS response reports the number of messages in the
mailbox.
This response occurs as a result of a SELECT or EXAMINE command,
and if the size of the mailbox changes (e.g. new mail).
The update from the EXISTS response MUST be recorded by the
client.
Example: S: * 23 EXISTS
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