How does a Gmail email filter spam?

Open "Gmail Mailbox", click on Spam in the mailbox, then click on the button in the upper right corner, expand the list to select "Filter this type of mail."

After clicking on "Filter This kind of mail", Gmail will pop up a filter message setting. In the setup, the user can set up the filter message subject, the addressee and so on the precise information.

Filter information set up, click on the lower right corner of the "based on this search criteria to create Filters", you can enter the spam processing methods to set up, such as: received a message directly skipped the Inbox or delete mail. When all is set, the user can click "Create Filter".

If the user wants to see the filter information or to modify or delete the filter, you can open the Gmail mailbox settings interface, click the "filter" into the can see different filters, in the sidebar can be modified or deleted filter.