Email Deliverability Checklist for Ecommerce Automation

## Introduction Ensuring high email deliverability is the bedrock of successful ecommerce automation. Without it, transactional emails, cart recovery, and promotional flows never reach the inbox. This checklist consolidates proven practices to help you safeguard sender reputation and maximize inbox placement. ## 1. Core Authentication Protocols - **SPF (Sender Policy Framework):** Publish a TXT record allowing only authorized servers to send on behalf of your domain. Validate with `dig TXT yourdomain.com`. - **DKIM (DomainKeys Identified Mail):** Generate a DKIM key pair via your ESP or mail server, publish the public key in DNS, and enable signing. This ensures message integrity. - **DMARC (Domain-based Message Authentication, Reporting & Conformance):** Create a DMARC record with a policy of `p=none` initially, then move to `p=quarantine` or `p=reject` as you gain confidence. Set up aggregate reports to monitor authentication results. ## 2. Domain and IP Warm-Up - **New Sending Infrastructure:** Gradually ramp up volume over 4-6 weeks. Start with your most engaged subscribers and increase daily limits by 10-20% per week. - **Dedicated IP:** If using a dedicated IP, warm it separately by sending low-volume campaigns to highly engaged users first. - **Subdomain Consideration:** Use a dedicated subdomain (e.g., `mg.yourshop.com`) to isolate reputation from your primary domain. ## 3. List Hygiene and Permission - **Confirmed Opt-In:** Double opt-in is non-negotiable. It prevents spam traps and ensures recipients genuinely want your emails. - **Regular Cleaning:** Suppress hard bounces immediately. Segment or remove subscribers who haven’t engaged in 90-180 days. - **Avoid Purchased/Rented Lists:** These are the fastest way to blacklists and Spamhaus listings. - **Unsubscribe Process:** One-click unsubscribe and honor all opt-out requests within 2 business days (automate it). ## 4. Content and Template Best Practices - **Spam Filter Triggers:** Steer clear of excessive exclamation marks, all-caps, and deceptive subject lines. Tools like Mail Tester can pre-scan your emails. - **Text-to-Image Ratio:** Maintain at least 60% text and 40% images. Avoid image-only emails. - **Personalization:** Use merge tags to insert customer names, known preferences, and behavioral triggers. - **Plain-Text Version:** Always include a plain-text alternative to satisfy filtering algorithms. ## 5. Sending Cadence and Volume Consistency - **Steady Flow:** Abrupt spikes in volume will alarm ISPs. Plan campaigns such that daily volumes stay within a predictable band. - **Segmentation:** Tailor frequency based on engagement. Active openers can receive more, while lapsed subscribers should be throttled. - **Time of Day:** Test sending windows for your audience. Too many simultaneous messages can strain your own server and ISPs if misconfigured. ## 6. Real-Time Monitoring and Feedback Loops - **Bounce Handling:** Classify soft vs. hard bounces. Pause soft bounces after 3-5 consecutive failures; suppress hards instantly. - **Complaint Rate:** Keep spam complaints below 0.1% (ideally <0.05%). Set up Google Postmaster Tools and Microsoft SNDS to track them. - **Feedback Loops (FBL):** Enroll in all major ISP feedback loops. Process complaints immediately by suppressing those addresses. - **Seed Testing:** Use services like Inbox Monster or GlockApps to seed inboxes across providers. Check placement rates weekly. ## 7. Infrastructure and Technical Tuning - **Dedicated IP vs. Shared:** For high-volume senders, a dedicated IP offers control but requires constant warm-up and reputation maintenance. Shared pools work well for consistent, moderate volumes. - **Throttling and Connections:** Configure your MTA or ESP to limit simultaneous connections per receiving domain and to respect retry windows. - **IPv6 Preparation:** Ensure your IP reputation monitoring covers IPv6. Major ISPs increasingly prefer it. ## 8. Emergency Deliverability Fixes - **If Blacklisted:** Identify the cause, correct it, then submit delisting requests. You may need to temporarily switch IP or suspend campaigns. - **Reputation Reset:** In severe cases, start over with a fresh subdomain/IP and strict warm-up. ## Conclusion Deliverability is not a one-time setup; it’s a continuous vigilance cycle. Apply this checklist weekly to detect issues early. By respecting your subscribers and the technical protocols, you’ll achieve the 98%+ inbox rates that drive ecommerce revenue.