Case Study: Email Deliverability Fix and Inbox Recovery
From 32% Inbox Placement to 91% in 4 Weeks
Email deliverability is not just about sending emails. It is about ensuring those emails reach the inbox consistently. This case study demonstrates how structured infrastructure corrections and reputation recovery improved overall inbox performance significantly.
Client Background
A SaaS startup was running cold outreach campaigns through Amazon SES. Despite strong messaging and targeting, a large percentage of emails were landing in spam.
Core Problems Identified
- Duplicate SPF records causing authentication failures
- DKIM misalignment with sending domain
- No DMARC monitoring policy
- 800 emails per day sent from a newly registered domain
- Cold outreach and transactional emails mixed under one domain
Solution Implementation
1. Authentication Correction
SPF was consolidated into a single optimized record. DKIM was properly configured and aligned. DMARC was introduced with p=none for monitoring before gradually moving to enforcement. Reverse DNS (PTR) was also corrected.
2. Domain Segmentation
- mail.company.com for transactional communication
- outreach.company.com for cold campaigns
This separation protected business-critical mail flow.
3. Warm-Up and Volume Control
Sending was paused for 5 days, then gradually resumed:
- Week 1: 30 emails/day
- Week 2: 60 emails/day
- Week 3: 100 emails/day
- Week 4: 200 emails/day
4. Content Simplification
Heavy HTML templates were replaced with plain text emails, personalized introductions, and only one contextual link.
Performance Comparison
| Metric | Before Optimization | After 4 Weeks |
|---|---|---|
| Inbox Placement | 32% | 91% |
| Bounce Rate | 6.8% | 1.8% |
| Spam Complaints | 0.9% | 0.05% |
| Open Rate | 18% | 47% |
Key Recovery Result
Inbox placement increased by 59 percentage points within four weeks while maintaining low complaint and bounce rates.
Business Impact
- Reliable transactional email delivery restored
- Improved domain reputation across Gmail and Microsoft
- Reduced support tickets related to missing emails
- Stronger domain protection against spoofing
- Scalable and compliant email infrastructure
Conclusion
Email deliverability recovery requires technical accuracy, controlled volume growth, and disciplined monitoring. When authentication alignment, domain segmentation, and structured warm-up strategies are properly implemented, inbox placement becomes sustainable.