My personal domain has hundreds of aliases - one for each site I deal with. This is great for identifying the source of spam, and I retire any aliases that get spam.
haveibeenpwned.com lets me add a domain, but wants 3912 USD a year to actually tell me which addresses leaked. This is obviously an insane price for a nice-to-have.
Is there an alternative for free or very cheap? A self-hosted tool that would pull down lists would be great, but I suppose those lists aren’t public.


$4000 USD a year he better be delivering caviar to your doorstep (that shit is cheap now)
It’s because of Enterprise contracts, for the things you can check off with HIBP… 4 grand is not a lot for them. But, then also if you offer a separate plan and just say ‘no enterprise, we trust you’, many businesses will just ignore the enterprise plan.