2.2.14 [RFC2449] Section 4, Commands Up To 255 Octets

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E0007:

The specification states: "Servers which support the CAPA command MUST support commands up to 255 octets. Servers MUST also support the largest maximum command length specified by any supported capability."

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

By default, the maximum length of a command is 47 bytes in Exchange 2007 and 512 bytes in Exchange 2010, Exchange 2013, Exchange 2016, and Exchange 2019. The Set-PopSettings cmdlet –MaxCommandSize parameter can be used to set the maximum length of a command in Microsoft Exchange Server. The minimum size is 40 bytes, the maximum size is 1024 bytes.