How is it clear, since you don't know what the applying opposition means?
I don't think an applying square is necessarily indicative of hacking, especially since there is no mutual reception. What this shows is a difficult relationship of some sort without much interest in resolution.
Neither is there any aspect between the Moon and the significators, showing their connection, so I do wonder what sort of relationship this is? The Moon is applying to oppose Venus, ruler of the 11th and 4th...but the querent hasn't explained the relationship between him/herself and the Saturn person. Perhaps an ex-friend? Venus has to have signification, but it is up to the querent to explain the symbolism based on past experiences with this other person...otherwise, we can only guess.
The Moon is in Via Combusta...it is immediately applying to Jupiter, ruler of the turned 3rd. The problem with this aspect is that you are asking about something that has
already happened, but an applying aspect usually shows
things that haven't happened yet. This being the case it seems doubtful that this 'he' was involved in it, although I take note of Uranus sitting in the 9th and Mercury, ruler of your email, applying by sextile, so it's a possibility, however slim. This would seem to me to be some sort of technical error rather than human interference, because both Mercury and Uranus are more or less neutral planets.
But again, without knowing the reasons
why you think it's this particular person, and what his relationship is to you, it's best not to guess. A judgement without the full story is not a good judgement.
AG