1. A computer-implemented method comprising: receiving, at an email application executing on a computing device, an incoming email message addressed to a user, wherein the email application is communicatively interfaced to a calendar application associated with the user, and defines a filter for the incoming email message; retrieving event information from the calendar application responsive to receiving the incoming email message, the event information comprising an identifier that identifies a predetermined action to be performed by the email application when processing the incoming email message; converting the incoming email message and the event information between a first format associated with the email application and a second, different format associated with the calendar application using a protocol interface associated with the email application; determining a prioritized execution order for the predetermined action and the filter based on the event information; and executing the predetermined action and the filter in the prioritized execution order when processing the incoming email message.