Key Takeaways
- Domain Authentication (Non-Negotiable)
- List Hygiene
- Sender Reputation Management
- Content and Sending Practices
If your emails land in spam, your email marketing investment delivers zero ROI. 20% of legitimate marketing emails never reach the inbox. Deliverability is the foundation every email strategy is built on — fix it before optimising campaigns.
Domain Authentication (Non-Negotiable)
SPF, DKIM, and DMARC records tell receiving mail servers that your sending domain is legitimate. Without authentication, major providers (Gmail, Outlook) route emails to spam. Configure all three in your DNS settings — most email platforms provide step-by-step instructions.
List Hygiene
Remove hard bounces immediately (invalid addresses damage sender reputation). Run your list through an email validation tool (NeverBounce, ZeroBounce) quarterly. Suppress non-openers after 90–180 days (send a reengagement sequence first). Clean lists maintain deliverability; stale lists destroy it.
Sender Reputation Management
Monitor your domain reputation in Google Postmaster Tools (free). Keep spam complaint rate below 0.1% (Gmail's threshold). Maintain consistent sending volume — dramatic volume spikes trigger spam filters. Warm up new sending domains gradually over 4–6 weeks.
Content and Sending Practices
Avoid spam trigger words in subject lines. Maintain text-to-image ratio above 60% text. Include a plain-text version of every HTML email. Never use URL shorteners in email links (spam signal). Send from a consistent from-name and reply-to address.
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.