Guides

How the parts
actually fit.

Writing grounded in real engagements: what a thing is, why it matters, and how to check your own. Plain enough for a business owner, precise enough for whoever administers the systems.

Email & deliverability11 min read

Anyone can send email as you. Here is how to stop them.

What the three layers of email authentication actually do, why they matter to any business that sends invoices or appointment reminders, and a real case where a domain's approved-sender list had quietly grown too long to work.