For years, a small agency owner was the person who logged into every client's registrar and got the records right. Then a one-click connect finished in about thirty seconds, and the checklist he was proud of turned out to be solving a problem the new flow routes around.

Hosted email is the most error-prone custom-domain task: MX, SPF, DKIM, DMARC, and client auto-discovery, all done exactly right. The dangerous part is that mistakes wreck deliverability without ever failing loudly. Here is how Custom Domain writes those records so a domain can add mail without breaking the mail it already sends.

Pointing a domain is the part everyone remembers. The TLS certificate is the part that quietly fails right after. Here is the race condition behind it, and how doing the validation in the same flow makes HTTPS just happen.

Platforms that reverse-proxy traffic live or die by being in the request path. The classic mistake is pointing the apex and forgetting www, so half the traffic bypasses your edge. Here is how to change every path at once, with consent, so nothing slips out unprotected.