Should I be worried?

I just got an email from a University Admin saying that someone from my VPS ip has tried posting to their blog 15k times (flooded the server). I'm not even sure how this happened, it must have been one of the scrapebox lists I was testing. Should I be worried about this?

I doubt they will take this too far, they might just tell you to make sure it doesn't happen again. Either way, apologize and say it was a software error or something, maybe just deny the whole thing, say it has to be a hosting issue.

no need to be worried just use a different list OR if possible remove their domain OR get the domain IP (theirs) and in your hosts file edit it to resolve to null.