2.2.34 [RFC3501] Section 7.4.1, EXPUNGE Response

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V0055:

The specification states that the server does not need to send an EXISTS response after an untagged EXPUNGE response decrements the number of messages in the mailbox.

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019

Upon successful completion of the EXPUNGE command, Microsoft Exchange Server sends an EXISTS response with the updated size of the mailbox.