@cannypigeons

Canny Pigeons

@cannypigeonsSydney, AustraliaJoined July 2026

DMARC monitoring that walks your domain to p=reject

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Canny Pigeons's blogs

Canny Pigeonscannypigeons.hashnode.dev10 posts

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CPCanny Pigeonscannypigeons.hashnode.devJul 23 · 5 min read

How to set up DMARC and DKIM for Mailchimp

Mailchimp sends your campaigns from its own servers, so by default the DKIM signature says d=mailchimp.com and the SPF check uses a Return-Path on mailchimp.com. Both checks pass — but for Mailchimp's

CPCanny Pigeonscannypigeons.hashnode.devJul 23 · 5 min read

DNS drift: why email authentication decays

Email authentication is configured in DNS, and DNS is a shared surface: your IT team, your web agency, your marketing tools, your registrar — and, if you're unlucky, an attacker — can all change it. T

CPCanny Pigeonscannypigeons.hashnode.devJul 23 · 6 min read

Source IPs in DMARC reports, explained

Every row of a DMARC aggregate report starts with an IP address, a message count, and one question: is this server mine? The IP itself carries more evidence than most people expect. Reverse DNS, geolo

CPCanny Pigeonscannypigeons.hashnode.devJul 23 · 3 min read

What is an ESP — and why does it fail DMARC?

An ESP (Email Service Provider) is any platform that sends email on your behalf: Mailchimp for newsletters, SendGrid or Mailgun for transactional mail, HubSpot or Klaviyo for marketing, Zendesk for su

CPCanny Pigeonscannypigeons.hashnode.devJul 23 · 3 min read

What is ARC?

Forwarding is authentication's blind spot: a forwarded message arrives from an IP that fails SPF, and mailing lists that tag subjects or add footers break DKIM too. ARC — Authenticated Received Chain

Canny Pigeons

About

Available for

Canny Pigeons's blogs

Recently published

How to set up DMARC and DKIM for Mailchimp

DNS drift: why email authentication decays

Source IPs in DMARC reports, explained

What is an ESP — and why does it fail DMARC?

What is ARC?

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Canny Pigeons

About

Available for

Canny Pigeons's blogs

Recently published

How to set up DMARC and DKIM for Mailchimp

DNS drift: why email authentication decays

Source IPs in DMARC reports, explained

What is an ESP — and why does it fail DMARC?

What is ARC?