AntispamMailDirection type
The directionality of this mail message
KnownAntispamMailDirection can be used interchangeably with AntispamMailDirection,
this enum contains the known values that the service supports.
Known values supported by the service
Unknown: Unknown
Inbound: Inbound
Outbound: Outbound
Intraorg: Intraorg
type AntispamMailDirection = string