Setting Auto Responses in Gmail

To have Gmail automatically reply to emails based on a set of criteria, follow these instructions to set up your inbox properly:

Turn on Canned Responses by opening Gmail's Settings (the gear icon) and enabling the Canned Responses option in the Advanced tab.
Create the template you wish to use for auto-replying to messages.
Select the Show Search Options triangle in the search field at the top of Gmail. It's the small triangle on the right side of the text area.
Define the criteria that should apply to the filter, such as the sender's email address and any words that should appear in the subject or body.
Select the link at the bottom of the filtering options called Create filter.
Check the box next to the option called Send canned response.
Open the drop-down next to Send canned response and choose which canned response to sending out when the filtering criteria are met.
Select any other filtering option you want to apply, such as the one to skip the Inbox or delete the message.
Select Create filter.
The newly created filter becomes stored in the Filters and Blocked Addresses section of Gmail's Settings.