Spam filters are more sophisticated than ever. In 2026, landing in the inbox requires proper authentication, clean content, and smart sending patterns.
Here's a practical guide to keeping your cold emails out of spam.
Authentication (The Foundation)
Before sending a single cold email, ensure:
- SPF is configured for your sending domain
- DKIM signatures are set up
- DMARC policy is published (start with p=none)
Without these, you're fighting an uphill battle.
Content Rules
Do:
- Write like a human, not a marketer
- Keep emails short (50-100 words)
- Use plain text or minimal HTML
- Include a real email signature
- Add one clear CTA
Don't:
- Use spam trigger words ("guaranteed", "act now", "free")
- Include more than 2 links
- Attach files
- Use ALL CAPS or excessive exclamation marks
- Send identical content to hundreds of recipients
Sending Patterns
- Start slow with new domains (10-15/day)
- Gradually increase over 2-3 weeks
- Use sender rotation across multiple mailboxes
- Send during business hours
- Respect daily sending limits
List Hygiene
- Verify emails before importing
- Remove bounces immediately (ClickReach does this automatically)
- Don't email role addresses (info@, support@)
- Remove contacts who don't engage after a full sequence
Use Spintax
Identical content across many recipients is a spam signal. AI-generated spintax creates unique variations automatically, making each email slightly different while preserving your message.
