POP3MessageInfo is used to return information about messages stored on
a POP3 server. Its fields are used to mean slightly different things
depending on the information being returned.
In response to a status command, number
contains the number of messages in the mailbox, size
contains the size of the mailbox in bytes, and identifier
is null.
In response to a message listings, number
contains the message number, size contains the
size of the message in bytes, and identifier is null.
In response to unique identifier listings, number contains
the message number, size is undefined, and
identifier contains the message's unique identifier.
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