Email authentication guide
Check email DNS records before sending campaigns from your domain
DevBoxy Email DNS Checker helps you inspect the public DNS records that affect email delivery, sender reputation, and inbox placement. Use it to verify MX, SPF, DKIM, and DMARC records before sending marketing campaigns, transactional emails, newsletters, or business email from a domain.
Correct email authentication records help mailbox providers understand which servers are allowed to send mail for your domain. Missing or incorrect records can cause messages to land in spam, fail authentication, or be rejected by Gmail, Outlook, Yahoo, and other mailbox providers.
This tool is useful for domain owners, marketers, developers, agencies, and IT teams who need a quick DNS health check for email deliverability. Always review DNS changes after publishing because propagation can take time across resolvers.
Records to verify
- MX records for inbound mail routing
- SPF record for allowed sending servers
- DKIM key for signed outgoing messages
- DMARC policy for domain protection
Why it matters
- Improve email deliverability and trust
- Reduce spam folder placement
- Protect your domain from spoofing
- Prepare domains for campaign sending
Common issues
- Multiple SPF records on one domain
- Missing DKIM selector record
- DMARC policy not published
- DNS changes not fully propagated