Your own filters on Gmail may allow you to automatically delete the spams emails or bullying and annoying emails whenever they arrive to your inbox or to the spam folders. See how to create a filter in Gmail
Open the type of email you want to filter Now click More
Now Click on Filter Messages like this
Now set the preferences to the subject and the words that have
Now set the action to corresponding filter and click on create filter
And Now Your filter is created. This filters are really useful for the user who want to block emails from the specific senders and multiple senders too. You can also apply it to the bullying and annoying emails.