Large traffic burst from Microsoft AS8075 (57.155.170.x) to our website after Dynamics campaign

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Posted on by Shaomin

Any recommendations to mitigate sudden traffic spikes from 57.155.170.x (Microsoft IP range) after sending a Dynamics 365 Customer Journey marketing email?

We send a Customer Journey email to a segment of ~30,000 recipients. Immediately after the email is sent, our web server logs show a burst of thousands of requests originating from Microsoft IPs (notably 57.155.170.x), hitting the URLs in the email and related page assets.

Is this expected behavior (e.g., link scanning / Safe Links / security prefetch)? If so, what are best practices to minimize the load on our site while keeping the email links functional

Categories:

Dynamics 365 Customer Insights - Journeys

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