Key Takeaways
- Technical Authentication Setup
- Sender Reputation
- List Hygiene Practices
Email deliverability is the ability of your emails to reach subscribers' inboxes rather than spam folders. Inbox placement rates have declined as email providers increasingly filter based on sender reputation, engagement signals, and technical authentication. Poor deliverability silently kills email ROI.
Technical Authentication Setup
All three authentication records are required: SPF (Sender Policy Framework) — authorizes mail servers to send on behalf of your domain. DKIM (DomainKeys Identified Mail) — cryptographically signs emails to verify they have not been modified. DMARC (Domain-based Message Authentication) — tells receiving servers how to handle authentication failures. Configure all three in your DNS records — this is table stakes for any email program in 2025.
Sender Reputation
Your sender reputation is a score maintained by email providers (Gmail, Outlook) based on: spam complaint rate (keep below 0.1%), bounce rate (keep below 2%), engagement rate (opens and clicks signal wanted mail), and list quality (invalid addresses damage reputation). Monitor your reputation at Postmaster Tools (Gmail) and Smart Network Data Services (Microsoft).
List Hygiene Practices
Remove hard bounces immediately after the first bounce. Remove unsubscribers instantly. Create a re-engagement campaign for subscribers who have not opened in 6 months — give them a reason to re-engage or unsubscribe rather than silently never open. Smaller, engaged lists outperform larger unengaged ones.
Quick Facts
The OwlClaw team brings together specialists in SEO, paid media, social marketing, and AI automation — delivering measurable growth for 150+ businesses across India.