Hello, I'm looking into using mox for sending transactional email from a SaaS web application. For handling transactional email, I would need some way to get notified when an email bounces, so the web application can take appropriate action (suppress sending to the bounced address for some time period or indefinitely, show email delivery status in UI, use a fallback email address, etc.). In transactional email services this is typically handled via webhooks: when an email bounces, the service calls a configured webhook with bounce details in the HTTP POST request body. The webhook address can either be pre-configured, or come from a designated email header.

@mjl- would you be interested in having something like this in mox? And, more generally, is the SaaS transactional emails use case something you would be interested in targeting? Thanks!