Spam is the bane of all messaging administrators, as well as a major pain for all email users. Using email means a consistent battle against spam, malware, and unwanted nonsense flooding your inbox. There are a number of different tools and tactics we, as administrators, can use to reduce the impact of these attacks and recently Microsoft has added another one to the toolboxes of Office 365 customers. In this blog post I'm going to explain what DKIM is, and how you can use it to help make the world a safer place for legitimate email messages.

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