Function switch_simple_email 

pub unsafe extern "C" fn switch_simple_email(
    to: *const c_char,
    from: *const c_char,
    headers: *const c_char,
    body: *const c_char,
    file: *const c_char,
    convert_cmd: *const c_char,
    convert_ext: *const c_char,
) -> switch_bool_t