This property is a comma-separated list of words used to identify "unsubscribe" directives from users in the body of mail messages.
IDL Definition
[propget]
HRESULT UnSubKeywords([out, retval] VARIANT *pVal /*VT_BSTR*/);
[propput]
HRESULT UnSubKeywords([in] BSTR newVal);Type
BSTR
Default
" Cancel, UnSubscribe"