Groups.io is a provider of email discussion group hosting that has been around a good long while (launched in 2014) and serves up rather a lot of email. That gives them insight into delivery delays and connection problems relating to internet service providers and mailbox providers both big and small -- the places where their users and those users' community members host their own mailboxes, and from where they communicate with each other, using the platform and tools provided by Groups.io.Th...
