Spamhaus Releases Sender Guidelines

While dozens of blocklists have faded into history or irrelevance over the past 25+ years, Spamhaus remains the heavyweight when it comes to IP and domain reputation. They run one of the oldest anti-spam blocklists in existence, still trusted by major mailbox providers and internet service providers (ISPs) worldwide. If your sending IP or domain lands on a Spamhaus list, you are going to have deliverability problems. And following in the footsteps of Google, Yahoo, and Microsoft, Spamhaus has officially published its own comprehensive Spamhaus Sender Guidelines to spell out exactly what it takes to be a good sender and keep yourself from landing on the wrong end of a Spamhaus-related blocklist issue.Some of these requirements, you're well aware of already, or should be. They are strong proponents of confirmed opt-in (aka double opt-in), working forward/reverse DNS and resolvable HELO/EHLO are musts, and they recommend full email authentication with SPF, DKIM, and DMARC, too.They go…