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Field notes from building outbound systems for B2B teams — infrastructure, research, and the numbers behind both.

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Isometric scene of a sealed primary domain cube protected behind an isolation wall from a separate sending domain cube

Email Deliverability Latest · March 17, 2026 · 7 min read

What Is a Sending Domain? How to Set Up Dedicated Cold Email Domains

Sending cold email from your primary business domain is one of the fastest ways to destroy your email reputation. Here is how to set up dedicated sending domains properly.