Comment by dwrowe

It’s really a great solution in a long-running job situation, the more I think about it. Especially on your point about setting up infrastructure. Email, in this case, is effectively a webhook handler for their results. Doesn’t require the end user to maintain the endpoint though, and can leverage the existing redelivery attempts, etc. May not be the “coolest” - but leverages decades of accumulated knowledge and reusable solutions.