Fastmail also has the feature of being able to generate throwaway email addresses for sign-ups and it doesn't require installation of any extension - they call

Fastmail also has the feature of being able to generate throwaway email addresses for sign-ups and it doesn't require installation of any extension - they call it masked email in the settings[0]. Pretty happy with it. https://www.fastmail.com/settings/masked https://www.fastmail.com/settings/masked