The Deliverability Playbook: How to Stay Out of Spam



    InkBrief Blog
    Edition No. 002
  
  
      The Deliverability Playbook: How to Stay Out of Spam
      Your newsletter is only as good as its inbox placement. Here's the complete guide to authentication, warm-up, and list hygiene.
    

      Hey there 👋
      Here's a stat that should make every newsletter operator pause: 21% of legitimate marketing emails never reach the inbox. They end up in spam, promotions tabs, or simply vanish into the void. The difference between a 40% open rate and a 20% open rate often has nothing to do with your content — it's your infrastructure.
This edition is your complete deliverability playbook. We're covering the three pillars that determine whether your emails land in the inbox or the junk folder: authentication, sender reputation, and list hygiene.
    

      🛡️ Technical Guide
      The Three Pillars of Email Deliverability
      Pillar 1: Authentication. SPF, DKIM, and DMARC are no longer optional — they're table stakes. Gmail and Yahoo now reject emails from domains without proper DMARC alignment. The good news: setting these up is a one-time effort. SPF tells receiving servers which IPs are authorized to send on your behalf. DKIM cryptographically signs your messages. DMARC ties them together with a policy. If you haven't configured all three, that's your first action item after reading this.
Pillar 2: Sender Reputation. Think of it as a credit score for your email domain. Every bounce, spam complaint, and unengaged send lowers it. Every reply, forward, and positive engagement raises it. The key metric to watch is your spam complaint rate — Google recommends staying below 0.1%. If you're above 0.3%, you're in danger territory. The fix is almost always better targeting: send to people who actually want your content.
Pillar 3: List Hygiene. This is where most newsletters fail. That subscriber who signed up 18 months ago and hasn't opened a single email? They're actively hurting your deliverability. Run a re-engagement campaign quarterly: send a simple 'Still want to hear from us?' email. Anyone who doesn't respond in 14 days gets sunset. Yes, your subscriber count will drop. But your engagement rates — and inbox placement — will skyrocket.
      
        "The best subject line in the world doesn't matter if your email lands in spam. Deliverability isn't glamorous, but it's the foundation everything else is built on."
        — Aisha Patel, Email Infrastructure Lead at Postmark
      
    
      Deliverability by the Numbers
      
        21%
of legitimate emails miss the inbox 0.1%
max recommended spam complaint rate 3×
better placement with proper DMARC
      
      
        Key takeaway
        Deliverability is not a 'set it and forget it' problem. It requires ongoing attention to authentication, sender reputation, and list hygiene. Schedule a quarterly deliverability audit — check your DNS records, review your bounce rates, and sunset inactive subscribers. Your future open rates depend on it.
      
    
      Check Your Deliverability Score
      InkBrief includes built-in deliverability monitoring on all paid plans.
      View Your Score →
    
  
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