Cookie: mailpoet_services_pingbridge_last_success_at | WordPress.org

Could you tell me, please, what the purpose of the cookie mailpoet_services_pingbridge_last_success_at is? I can’t find anything about it in your Knowledge Base.

Oddly, it seemed to be set when I clicked on a video on my site that uses an unrelated plugin, WP YouTube Lyte.

The page I need help with: [log in to see the link]