2.2.6 [RFC1939] Section 7, TOP Command

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C0006:

The specification states: "The POP3 commands discussed above must be supported by all minimal implementations of POP3 servers."

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

The server MUST support all the commands discussed above.

V0007:

The specification states that the TOP command is an optional POP3 command.

Exchange 2007, Exchange 2010, Exchange 2013, Exchange 2016, Exchange 2019

Exchange POP3 implements the TOP command.