Cold Email Deliverability Guide
You can write the perfect cold email, but it is worthless if it lands in spam. Deliverability is the foundation of cold outreach — without it, nothing else matters. This guide covers the technical setup and content practices that determine whether your emails reach the inbox or get filtered into oblivion.
Key Points
Set up SPF, DKIM, and DMARC
These three DNS records authenticate your emails and prove to receiving servers that you are who you claim to be. Without them, your emails are far more likely to be flagged as spam. Most domain registrars make this easy — it takes 10 minutes to set up properly.
Warm up your sending domain
Sending 500 cold emails from a brand new domain on day one is a fast way to get blacklisted. Start with 10-20 emails per day and gradually increase volume over 2-3 weeks. Use a warming service or send manual emails to build reputation.
Personalization improves deliverability
Spam filters analyze email content. If every email you send has the same body text, it looks like spam — because it is. Personalized emails with unique opening lines and prospect-specific details signal to spam filters that each message is individually crafted. Icebreaker makes this easy at scale.
Monitor bounce rates and engagement
Keep your bounce rate under 3% by verifying email addresses before sending. Track open rates and reply rates — high engagement signals to email providers that your messages are wanted. Remove unresponsive contacts after 2-3 follow-ups.
Why Icebreaker?
- AI-powered — researches prospects from URLs and generates personalized email copy automatically.
- 10x cheaper than Clay — same quality personalization at a fraction of the cost.
- Batch processing — upload a CSV of prospects and get personalized emails for all of them.
Ready to personalize at scale?
How to avoid spam filters and land in the inbox. Technical setup and content tips.
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