@bschillace well, to an extent it doesn’t matter any more than it matters who your email provider is. Whether you are with your ISP, Google, Yahoo, iCloud - will get through. However some email providers are more reliable than others. And some have a bad reputation for spam, so if you are sending mail, it may get rejected. That’s the ‘Federated feed’ Unlike e-mail, there is also the separate local feed. Some servers have clusters of common interest on them …