#practicalguides

To hang a picture straight, measure the wall and the frame before making a hole.

To remove carpet stains, act quickly and blot instead of rubbing the spill deeper into the fibers.

SPF, DKIM and DMARC all live in DNS, and most authentication failures come down to how those records are published rather than the policy itself. This guide covers where each record goes, the common hosting mistakes, and how to check your work.

Your DMARC policy might protect your main domain while leaving every subdomain wide open. Here is how the sp tag works, why it exists, and how to set it correctly.

DMARC is the standard that tells the world's mail servers what to do with email pretending to be from your domain - and reports back on what they saw. Here is how it works, in plain English, with no diagrams to decode.