Setting up filters in Gmail
Gmail filters are an easy way to manage your mail based on a set of criteria that you provide.
Filters can be created to label, archive, star, forward or delete messages and even keep them out of Spam. In fact, it's a great idea to create filters to keep important mail from ever being marked as spam.
For information on setting up filters, see Google's Using Filters help page.
Filters can also be used to create a canned response, such as a "We have received your application" response to an email from a job applicant.