There are a number of reasons why you might want to export the email addresses of users on your site.
Maybe you had a newsletter or subscription service that you’re moving to an offsite provider. Or maybe you just need to import the address into a different plugin or piece of software.
WordPress doesn’t exactly make it easy to extract the email addresses of users on your site out of the box, but there’s a plugin that will let you do the trick very easily.
Plugin for Exporting Emails
At least one plugin you can use for this job is called Export Emails.