You made a throwaway account to say this?

Yes. Because it’s funny and I don’t have any other account.

I don't see the humour.

I can’t help you.

didn't ask

Technically (or, at least, historically), they should have used the indefinite pronoun "one" i.e. "...because their defense systems seem overly sensitive to one's email address". But I imagine that would've got more comments than using you/your.

No, using “your” in such a context is a manipulation tactic.