IRIS Interoperability formerly known as Ensemble comes with many built in adapters. It does not have a service or adapter to receive mail. I have written email service to receive mail messages via SMTP which can be passed to email operation.
InterSystems Data Platform Solutions Open Exchange is a gallery of software solutions, tools, and frameworks which were developed with InterSystems Data Platform (Caché, Ensemble, HealthShare, InterSystems IRIS, InterSystems IRIS for Health) or are intended to help in development, deployment and support the solutions built with InterSystems Data Platform.
You can use any of the published assets or you can publish your own tool, technology example or solution.