Email deliverability checker
Emails going to spam? Enter your domain to check SPF, DKIM, DMARC and MX in seconds — and get the exact fix for anything missing.
Checks public DNS records only. Nothing is stored and no email is sent.
Why emails go to spam
Inbox providers decide where your email lands using three things: whether it's authenticated, the reputation of the domain and servers sending it, and how recipients react to it. Authentication is the foundation — without SPF, DKIM and DMARC, even good email is treated with suspicion.
- Missing authentication: no SPF, DKIM or DMARC, or records with errors.
- Poor domain reputation: past spam complaints, bounces or blacklisting.
- Volume spikes: a new domain or mailbox suddenly sending hundreds of emails.
- Bad lists: old, bought or unverified addresses that bounce.
- Content: heavy links, images, tracking and spam-trigger phrasing.
What the checks mean
SPF — a TXT record listing the services allowed to send as your domain. You should have exactly one, ending in ~all or -all, using no more than 10 DNS lookups.
DKIM — a cryptographic signature added by your email provider. Google Workspace and Microsoft 365 both support it, but it often isn't switched on.
DMARC — a policy telling receivers what to do with email that fails SPF or DKIM, plus reports showing who sends as you. Start at p=none, then enforce.
MX — where your domain receives email. Without it, replies and bounces go nowhere.
Sending cold email?
Keep it off your main domain. Use separate sending domains with their own authentication and warm-up — see why and how to move cold email off your main domain and the deliverability review.
Questions
Why are my emails going to spam?
The most common reasons are missing or broken authentication (SPF, DKIM, DMARC), a sending domain with poor reputation, sudden jumps in volume, sending to old or unverified lists, and spam-like content or links. Fix authentication first — it's the easiest to check and the one inbox providers now require.
What are SPF, DKIM and DMARC?
SPF lists the servers allowed to send email for your domain. DKIM adds a digital signature that proves an email wasn't altered. DMARC tells receiving servers what to do when SPF or DKIM fail, and sends you reports. Together they prove your email is really from you.
Do I need DMARC?
Yes. Google and Yahoo require bulk senders to publish a DMARC record, and it protects your domain from being spoofed. Start with p=none to collect reports, then move to quarantine or reject.
Does this checker test my domain reputation?
No — it checks your public DNS records. Reputation depends on how your domain has been used for sending, which tools like Google Postmaster Tools show over time. Managed outbound covers reputation, warm-up and sending practice as well.
Should I send cold email from my main domain?
We recommend not. Use separate, properly authenticated sending domains so that your main domain — and your everyday email — is protected.