Authentication is Key
Ensure your domain has the following DNS records set up correctly:
- SPF (Sender Policy Framework): Specifies who can send email on your behalf.
- DKIM (DomainKeys Identified Mail): Adds a digital signature to your emails.
- DMARC: Tells servers what to do if SPF/DKIM fail.
Volume and Content
Avoid sending large bursts of email to cold lists. Warm up your IP gradually. Avoid using spammy keywords in subject lines.