Resources
What we have learned running this layer, written down.
We publish the reasoning behind the work: how authentication, reputation and the major providers’ rules actually behave, with sources attributed on the page. Start with the guides below, then the free tools, the benchmark data and the blog.
Guides & references
In-depth, and kept current
Reference pages we maintain as the rules change. Each is written to be read on its own, whether or not you ever hire us.
More in resources
Tools, data and field notes
Free tools
A DMARC record generator and a spam-complaint-rate calculator — in your browser, nothing sent anywhere.
Benchmarks & data
The deliverability figures we cite, collected with their sources and a note on method.
Blog
Field notes and analysis on provider enforcement, authentication and infrastructure.
Rather have it checked than read about it?
The free 25-point audit applies all of the above to your own infrastructure and tells you where you actually stand.