Yes - I worked on this as well. Very similar concept to some of the other solutions here. Self-hosted (keep mail internal, fast) - Invent any email address you like (†), trap it all here. View it via the app, or query via REST. Designed to be open, this is really useful when you don't want to have to setup mailboxes, or deal with the additional header of catch-all addressing. I'm currently adding attachment support for the next release.

† This comes with the caveat that you don't use PII, because people make configuration mistakes - but if that's how you do testing, then I'd argue you have bigger problems in your organization than capturing mail. We use it with somefakeguy@ourdomain.com, someotherguy_datetime_from_automatedtest@ourdomain.com, rather than just sending stuff to _real_ addresses.