The class fills out Headers each time any of the other properties for that ediattachment are changed.
def get_attachment_headers(attachment_index: int) -> str: ... def set_attachment_headers(attachment_index: int, value: str) -> None: ...
The class fills out attachment_headers each time any of the other properties for that ediattachment are changed. If additional headers are needed they should be appended after all the other propertys for that ediattachment are set.
The attachment_index parameter specifies the index of the item in the array. The size of the array is controlled by the attachment_count property.