Gmail will no longer support checking emails from third-party accounts via POP, a feature that allowed users to fetch emails from other accounts into their Gmail account. This change affects the web version of Gmail, but users can still access their emails from other accounts using the Gmail app on mobile devices. The option to 'Check mail from other accounts' will no longer be available in Gmail on computers. Users can set up automatic forwarding or add their account to the Gmail app to continue accessing their emails.