Media Mail Cutovers: Wildcard DNS, Customer Verification, and Tenant Records
A media publisher cannot treat domain onboarding as complete when a page loads. Newsletters, alerts, and contributor mail also need SPF, DKIM, and D…
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Setting Up DNS for SaaS Emails
When you create a Software as a Service (SaaS) or a social web platform, one of the often-overlooked parts of it is the email DNS configuration. I l…
Customer Domain Verification: Scheduled Polling and Triggered Rechecks for Tenant Onboarding
Give each fintech tenant a platform-owned subdomain first, and activate it from the platform's own DNS change. For a customer-owned hostname, run sc…
Customer Support DNS: Migrate a Zone with 4-Gate Diff Before Nameservers
The page arrives after a customer changes nameservers: their support portal passes ownership checks, but mail for the same domain no longer behaves…
DNS Record Write Rejected Because Zone ID Is Not Domain Name — Validation Debug
Short answer: when a DNS record write is rejected because a zone ID is not a domain name, resolve the opaque reference first, canonicalize the retur…
Property Domain Offboarding — Delete Records Without Whole-Zone Risk
Short answer: retire only the records owned by the departing property, never the whole DNS zone, unless an ownership check proves that the zone itse…
4 Failure Modes of TXT Record Domain Ownership Verification in FastAPI Onboarding
Before writing any verification code, settle one thing about the customer's DNS: does your platform hold the zone, or does the customer? For a devel…
Node.js Sending Domain Onboarding: One Bundle Setup, Staged Mail Verification for Cutover
For an e-commerce sending domain, a one-step onboarding bundle can simplify setup, but it cannot make DNS and mail verification happen at one instan…
E-Commerce DNS Zones: Enumerate, Diff, Apply, and Verify in Node.js
Short answer: list the live DNS records, save that original snapshot, diff it against the intended set, upsert only the differences, and verify the…
Mail Going to Spam After Setup in 2026: Debug SPF, DKIM, DMARC Alignment
Short answer: inspect one received message and find which authenticated domain aligns with the visible From domain; DMARC passes when an aligned SPF…
Customer Domains and DNS Records: Signed URLs for Secure Asset Delivery
Short answer: point a customer subdomain at your asset host with a CNAME, then keep authorization in signed URLs. DNS decides where a request goes;…
Pushgateway Heartbeat Gotcha: When ndots and NetworkPolicy Silently Eat Your Alerts
A CronJob exits 0, Pushgateway shows a heartbeat metric that hasn't updated in days, and Prometheus fires nothing. Every dashboard is green while th…
Tech Talk Augusta — August Meetup Recap
Tech Talk Augusta — August Meetup Recap: DNS, AI, and Solving the Right Problem Our August Tech Talk brought together three very different talks, bu…
DNS Records Explained: A, AAAA, CNAME, MX, TXT, NS, and SRV Records in Modern Internet Infrastructure
In the previous article , we explored how DNS translates human-friendly domain names into machine-friendly IP addresses and how a request travels th…
Why your DMARC reports never arrive (and why Gmail can't be your rua address)
You published a DMARC record months ago. Every checker says it's valid. No reports have ever arrived, and at some point you stopped thinking about i…
DMARC Just Got 3 New RFCs. Your DNS Record Doesn't Need to Change.
If you've ever pasted v=DMARC1; p=reject; into a TXT record and moved on with your life, here's something worth two minutes: the spec behind that re…
I Built a Next-Gen DNS Diagnostic CLI in Rust That Visualizes DNSSEC Trust Chains
If you've ever tried to debug a DNSSEC misconfiguration using dig , you know the pain. You're staring at a wall of raw text, manually cross-referenc…