Answer
Not directly — email on its own can't execute an IFS process. The email/phone system instead needs to call into IFS through a proper integration point: either a custom REST endpoint (built in Developer Studio to accept the case details and an attachment, then create the record), or IFS Connect's standard inbound broker pattern (the external system drops a file to a location IFS Connect watches, with a routing rule and routing address that runs the PL/SQL logic to create the record and attach the file).