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Smaller / Regional Provider Updates

Don't forget the "local ports." This section covers the rules for major regional providers, like GMX/Web.de (Germany) or Comcast/Cox (USA), which often have different, "old-school" filtering rules.

10 questions in this topic

Questions about Smaller / Regional Provider Updates

What are common regional mailbox providers (GMX, Mail.ru, ProtonMail, Zoho, Yandex, etc.)? How do European MBPs differ in filtering philosophy? What’s unique about GMX and Web.de filtering? How does ProtonMail treat authentication failures? How does Mail.ru handle engagement scoring? How can regional providers enforce stricter DMARC policies? How do anti-spam appliances like Barracuda or Proofpoint fit in? What’s unique about university or government email filters? How do smaller providers rely on shared blocklist databases? How do international ISPs share spam reputation data?