Yahoo has confirmed that it is preventing some people from accessing their email if they are using ad-blocking software in their browser.
Some users in the US reported that Yahoo Mail was displaying a message asking them to disable their ad-blocker before they could access their inbox.
Ad-blocking has proved to be controversial and technology companies have responded in different ways.
In September, Apple updated its mobile operating system iOS to allow third-party ad-blockers to be installed – although they do not remove Apple’s own ads which it serves up in apps.
Yahoo stops some users accessing emails
