The three authentication records that tell email providers you're legit.
2
MX records
Confirm your domain can receive replies. No MX = emails bounce back.
3
Record quality
Not just pass/fail. We check if your records are correctly configured and flag common mistakes.
Questions we get every day
SPF (Sender Policy Framework) is a DNS record that lists which servers are allowed to send email from your domain. Without it, anyone can spoof your domain. Gmail and Outlook check SPF on every incoming email.
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to your emails. The receiving server checks this signature against a public key in your DNS. It proves the email wasn't altered in transit and actually came from your domain.
DMARC ties SPF and DKIM together and tells email providers what to do if authentication fails (nothing, quarantine, or reject). Without DMARC, providers make their own decision. With DMARC, you control it. Start with p=none, move to p=quarantine after 2 weeks.
Without proper authentication, your cold emails land in spam. Period. Gmail checks SPF, DKIM, and DMARC on every email. If any one fails, your deliverability drops significantly. This is the #1 technical reason cold email campaigns fail.
Yes. Check as many domains as you want. No signup, no limits.