Anyone can send you an email, but only you get to decide what happens next. For example, you can create a filter that marks an email as seen and moves it to the "Annoying" folder — As a result, your filter will automatically silence the email address that is bothering you.
How can I create a new filter?
Go to Settings > Mail > Filters and click on the "Add Filter" FAB button in the bottom-right corner. Here you can define:
Conditions under which the filter will run
Actions to execute when the conditions are met
Can the filter be automatically run for new emails?
Yes. While creating a filter, check the "Getting new email" checkbox to have the filter automatically run on all inbound emails before they hit your inbox.
Can I run the filter manually?
Yes. Click on the "Run" button in the filter's dropdown menu.
Will the filters work if I'm not using the app?
Yes. Filters run directly on the server, so it doesn't matter if you're using other email apps also.