The boundary separating the MIME parts. Maximum length of 80 bytes.
def get_boundary() -> str: ... def set_boundary(value: str) -> None: ...
boundary = property(get_boundary, set_boundary)
This property contains the boundary separating the MIME parts and has a maximum length of 80 bytes. The class will automatically generate a random boundary value during encoding if no value is given. During decoding this property is filled with the boundary from the actual MIME message.
The class will truncate any string longer than 80 bytes if assigned to boundary.