When an email reached routing address, a case should be created. Where as if any meeting invite hits the routing address, case should not be created. Do anyone have any idea?
If you wanna go custom with coding, you can implement inbound email service and do whatever logic you want with the email body, subject and what not. I have used it for plenty of stuffs like email to contact nd email to leads(Web to leads has limits) and many implementations using it.
Here is the link if you wanna go the code way. https://help.salesforce.com/HTViewHelpDoc?id=code_inbound_email.htm&language=en_US