Return Path (now Validity) manages a number of ISP feedback loops for ISPs all around the world. They've got a signup and management interface for this "Universal Feedback Loop Service" at fbl.returnpath.net. They have just announced that they've added Swisscom (bluewin.ch) and Telenet (telenet.be) to the list of ISP Feedback Loops that they have coordinated into this management interface. Senders, be sure to head on over to to fbl.returnpath.net.
That brings the grand total of ISPs/mailbox providers supported via the Universal Feedback Loop Service up to 24. This includes: BAE Systems (usa.net), BlueTie, Comcast, Cox, FastMail, Italia Online, Libero Mail, Virgilio, Laposte.net, Liberty Global, UPC/UnityMedia, Locaweb, Mail.ru, OpenSRS (Tucows), Rackspace, Seznam.cz, Swisscom, Synacor, Telenet, Telenor, Telstra, Terra, UOL, Virgin Media, XS4ALL, Yandex, and Ziggo.
When this launched a number of years ago, it was immediately innovative, a clear time saver for email senders -- allowing senders sign up for multiple ISP feedback loops all in once place, with a minimum number of steps. Thanks for Validity for continuing to support and enhance this valuable service.