DNS guides
Email authentication, one problem at a time
What each SPF, DKIM, DMARC and MX problem means for your cold email, and the exact record to fix it.
SPF
Which servers may send as your domain.
DKIM
A signature that proves the message is yours.
DMARC
What receivers do when SPF and DKIM fail.
Setup guides
Records for your email provider.
- Google Workspace
SPF, DKIM, DMARC and MX for Google Workspace.
- Microsoft 365
SPF, DKIM, DMARC and MX for Microsoft 365.
- Zoho Mail
SPF, DKIM, DMARC and MX for Zoho Mail.