Exchange

Forged sender addresses and domain-based spoofing attacks continue to be among the most effective attack vectors in email traffic. In the Microsoft 365 world, SPF, DKIM and DMARC are important and necessary building blocks for protecting sender domains, optimizing deliverability and making abuse transparent. However, consistent, technically sound implementation and ongoing operation are crucial. In this article, I will show you how to correctly implement DKIM and DMARC in Microsoft 365, what pitfalls there are and how to efficiently secure operations.