Understand what's happening to your email. Know what to do next.
Free diagnostics, a plain-language reference, and specialist help when you need a person on it. For anyone responsible for customer email, on any platform. From the team behind Cakemail.
Check what your domain publishes
Read how delivery actually works
139 articles across 16 topics, each listing the sources it draws on.
Open the reference →Have us review the evidence with you
Audits, incident investigations and change plans. Each service lists what we examine, what you receive, and its price.
See the servicesDomain check
Confirms what is published for SPF, DKIM, DMARC, MX and blocklists, and explains what each result means for you, not just pass or fail. It reads public DNS, so it can't see how your platform uses those records.
No account needed, and the check is free.
Check a domain- Found
- DMARC is published with policy p=none.
- Why it matters to you
- Reports are collected, but nothing is enforced. DMARC does not stop mail that forges your domain.
- Next action
- Confirm all legitimate senders align, then move to p=quarantine. How
How email delivery works, topic by topic
Every article lists the sources it draws on, and each topic shows how many articles it holds.
Compliance
18Operations
18ESP Operations
16Mailbox Providers
What Gmail, Yahoo, Microsoft and Apple require of senders who send in volume.15Reference
14Authentication
SPF, DKIM, DMARC, ARC and BIMI, record by record.13
Start here · Foundations
Foundations of Email Deliverability
The core principle of deliverability — sending wanted and expected email — and how mailbox providers measure it.
Start here · Foundations
The Seven-Step Delivery Model
A campaign-lifecycle mental model — assemble list, create content, transmit cleanly, deal with recipient issues, track, manage hygiene, fine-tune — mapping each step to the KB articles that cover it in depth.
When you need a person on it
Each service lists what we examine, what you receive, and its price. Recommendations follow the evidence; a platform change is never the predetermined conclusion.
- Deliverability auditUSD 1,500"Our delivery has got worse and I need to know why, and what to fix first."Prioritised findings with the evidence behind each one, and a 45-minute call to go through them.
- Emergency responseUSD 2,500 for the first response"We are blocklisted, or delivery dropped suddenly, and I need someone on it now."We start within one business day, establish what the evidence supports, and file delisting requests once the cause is fixed.
- ESP migration supportUSD 2,000"We are moving platform and I do not want delivery to suffer for it."Authentication planned on the new platform, a warm-up plan, a suppression-list checklist, and a defined review after the move.
- DMARC rolloutUSD 2,500"I want DMARC enforcing, without blocking mail we actually send."A staged rollout driven by what your reports show, with each observed sender accounted for before the policy tightens.
- IP and domain warm-up planUSD 1,000"We are sending from a new IP or domain and I do not want to damage our reputation doing it."A day-by-day plan for each major mailbox provider, with checkpoints, and a review after the second week.
- Monthly monitoring and supportFrom USD 1,500 / month"I want an expert looking at our programme regularly, and available when something changes."A written monthly review of your DMARC reports, reputation and blocklists, a 30-minute call, and up to 5 expert hours.