"The Mystical Qabalah" is a fine book but let's not forget that Hermetic Qabalism is a very simplified version of Jewish Kabbalah that evolved over centuries into ever more directions and grew ever more complex as authors often contradicted each other and sometimes even themselves, so strictly speaking, there's no such thing as one single, definite Kabbalah to be analysed or believed in. The Qabalah Dion Fortune learned from her teacher Theodore Moriarty is a streamlined version combining several Jewish Kabbalistic strands at the expense of others (for example Isaac Luria's teachings), also adding far-fetched correspondences that would have appalled the old rabbis, e.g with tarot cards or pagan planets/gods, like equalling Hod with Mercury or Netzach with Venus. The Hermetic Qabalah's greatest achievement is probably the famous Tree of Life glyph, and I've yet to find out if it was even used in Jewish Kabbalah - it's probably the result of Christian Cabalah and printing, since an intricate glyph like the Tree of Life would likely be garbled and distorted in the manual copying of ancient manuscripts. Dion Fortune more or less codified Hermetic Qabalah and turned disparate mystical philosophies centered on the Torah, Talmud, Mishna etc. into one single independent and workable occult system.
However, it's true that some Kabbalistic teachings have come about as a result of revelation from above. Several Kabbalistic rabbis claimed to have been taught be ancient prophets (Elijah was a favorite) and
or mentor angel (
maggid later came to mean 'preacher'). Isaac Luria was said to commune regularly with angels when he studied the Zohar on an island in the Nile in Egypt in the 16th century but any attempts to link the Jewish Kabbalah to the Jewish Captivity in Egypt (which many scholars say never happened anyway) or the 'wisdom of the pharaos' are ridiculous. When the Jewish Kabbalah began to emerge in late 12th century Provence, the Egyptians had been Muslims for hundreds of years; as early as at the time of the Greek Magical Papyri (2nd - 7th century AD), there was nobody left in Egypt who was able to read or write hieroglyphics.
So well, yeah, angels were involved at certain stages of the Kabbalah's transmisson too.