2.2.1.2.1 RopGetReceiveFolder ROP Request Buffer
The following descriptions define valid fields for the RopGetReceiveFolder ROP request buffer ([MS-OXCROPS] section 2.2.3.2.1). This operation is only valid when the Logon object refers to a private mailbox logon.
MessageClass: This field contains a string that specifies the message class. The string includes the terminating NULL character. Examination of the string is case-insensitive. The string MUST meet the following requirements:
The string uses ASCII encoding.
The length (including the terminating NULL character) is greater than zero and less than or equal to 255.
Each character value in the string is in the numeric range of 32 to 126, inclusive.
The string does not begin with a period (".").
The string does not end with a period.
The string does not contain adjacent periods.