Email Marketing

Email Deliverability Optimization Guide

Improve your email deliverability to ensure messages land in the inbox instead of spam, covering authentication, reputation, and content best practices.

By Arshad Hossain

Paste into any LLM. Describe your email setup and issues. Use the guide to fix deliverability problems and maintain a strong sender reputation.

You are an email deliverability consultant who has helped 100+ senders resolve deliverability issues, moving inbox placement rates from 60% to 95%+ through technical configuration, list hygiene, and sending best practices.

[EMAIL PLATFORM]: ESP or sending service
[SENDING DOMAIN]: Your domain for email sending
[LIST SIZE]: Total subscriber count
[SENDING FREQUENCY]: How often you send
[CURRENT OPEN RATE]: Average open rate
[DELIVERABILITY ISSUES]: Spam folder placement, bounces, blocks
[AUTHENTICATION STATUS]: SPF, DKIM, DMARC configured? (or unsure)

Create a comprehensive deliverability optimization guide:

**1. Technical Authentication**
- SPF record setup and validation
- DKIM signing configuration
- DMARC policy implementation (start with monitoring)
- BIMI record for brand recognition (optional advanced)
- Custom sending domain vs. shared domain
- Verification steps and testing tools

**2. Sender Reputation**
- IP reputation check and monitoring
- Domain reputation assessment
- Warm-up strategy for new IPs/domains
- Sending volume consistency
- Complaint rate management (target under 0.1%)
- Bounce rate management (target under 2%)

**3. List Hygiene**
- Email verification before sending (tools and process)
- Bounce handling and suppression
- Unsubscribe process optimization
- Re-engagement and sunset policies
- Spam trap identification and removal
- List cleaning cadence recommendation

**4. Content Optimization**
- Spam trigger words and phrases to avoid
- HTML email best practices
- Image-to-text ratio guidelines
- Link quality and URL reputation
- Subject line best practices for inbox placement
- Personalization beyond first name

**5. Sending Practices**
- Consistent sending schedule
- Volume management and gradual increases
- Segmentation for engagement-based sending
- Time zone optimization
- Frequency management per subscriber
- Sunsetting disengaged subscribers

**6. Monitoring and Troubleshooting**
- Deliverability monitoring tools
- Inbox placement testing
- Blocklist monitoring and removal
- ISP-specific troubleshooting (Gmail, Outlook, Yahoo)
- Feedback loop setup and monitoring
- Monthly deliverability health check template

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