Free email deliverability test.
Test your domain's email deliverability with live SPF, DKIM, and DMARC lookups, spam-risk flags, and the exact records to fix. In Blu, deliverability is a standing check: warm-up caps, complaint handling, and unengaged contacts suppressed before they burn the domain.
How to use the email deliverability test
It takes three steps and every output renders on this page so you can copy or export it right away.
Enter your sending domain
Type the domain your email goes out from. That's the only input, and the check reads your public DNS records.
Run the check
The email deliverability test looks up SPF, DKIM, and DMARC live and grades the domain pass, at risk, or fail. Every failing check comes with the record to add.
Open it inside Intempt
This page grades the domain once. In Blu, deliverability runs as a standing play: warm-up and ramp caps on the domain, suppression against your customer list, and a handoff to you the moment a record drifts.
Use in Claude
Blu AgentWho it's for
- Anyone troubleshooting why email is landing in spam
- Teams verifying email authentication after a provider migration or DNS change
What's in the download
SKILL.md- The SPF/DKIM/DMARC check logic and fix templates, plus instructions to run the same live public DNS TXT lookups directly (dig/nslookup or a public DNS-over-HTTPS API) - no MCP or email-platform account needed, since these are public DNS records.
How to install it
- Open Settings, then Capabilities
- Turn on code execution if it isn't already on
- Upload the .zip you downloaded
- Unzip the download
- Drop the folder into
~/.claude/skills/(or.claude/skills/in a project) - Claude Code finds it automatically
your-new-skill/
What you need
- Claude Desktop or claude.ai (Pro, Max, Team, or Enterprise for claude.ai upload)
- Claude Code: no plan restriction
Try it with
“Check acme.co's SPF, DKIM, and DMARC using the email-deliverability-checker skill”“Why might mail from this domain be landing in spam? Check its authentication records.”
Prefer an instant answer? Run it now above.
What you get from the email deliverability test
What it does on this page, and what it does inside Intempt.
An SPF DKIM DMARC checker that reads your live DNS
- Enter one domain, with no mailbox access or email provider connection
- SPF passes only when there's exactly one valid record at the root domain
- DKIM is checked at 8 common selectors, like google, selector1, and s1
What the DMARC checker tells you to fix
- Shows your DMARC policy and warns when it's p=none, which only monitors
- Each failing check comes with the record format to publish
- No DMARC record? It suggests p=none first, then quarantine, then reject
Warm-up and ramp caps are guardrails, not settings you remember
- The agent configures warm-up and ramp caps as part of setting up the send
- Daily ramp caps apply the moment a domain is new
- The guardrails are set up before the first real email goes out
Suppress against your own customer list on every send
- Paying customers never end up on the send list
- Do-not-contact and unsubscribed contacts are excluded the same way
- You write the suppression rule, the agent applies it every time
Questions about theemail deliverability test.
Teams love it
They stopped stitching tools andhired one system.
StockInvest
“Acquisition and retention finally feel like one connected motion instead of two separate problems.”
Jim Stromberg
CEO, StockInvest
FieldsUSA“We finally have one system that sees the whole customer journey.”
Eric Gardner
COO, FieldsUSA
Hoperfy“With Intempt, we built a signal-led pipeline driven by real behaviors.”
Tadas Kertenis
Co-founder, Hoperfy
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