/email endpoint is giving 500 statusCode if I pass invalid messageId

[todoubled711]

We have automated tests that are validating emails are being sent via the mailinator API. In one scenario we are asserting that all the expected email recipients are receiving the email. In another scenario, we are validating that non-expected email recipients aren't receiving. Before the Mailinator /email endPoint would pass but display a message msg not found. Now the endPoint is failing with a status code 500. Any reasons why this might have suddenly started happening?

Thanks,
Todd