How to Ensure Killer Email Deliverability | eCommerceFuel Podcast Ep. 181 (2016) | Essence of Email

About this episode

In this classic eCommerceFuel episode, X Wang joins Andrew Youderian after Andrew hit a real-world blacklist issue — a timely reminder that deliverability is infrastructure, not an afterthought.

They walk through what quietly damages reputation over time (especially dormant and recycled addresses), practical rules of thumb for sunsetting and re-engagement, and how IP vs. domain reputation fits together as inbox providers evolve.

X also covers tools for monitoring reputation, what to do when you land on a blacklist, consent and opt-in tradeoffs at checkout and on pop-ups, single vs. double opt-in for eCommerce, SPF/DKIM/DMARC at a high level, and the reality of Gmail's Promotions and Updates tabs.

Listen on the eCommerceFuel episode page — same topics we still apply for brands on Klaviyo and other ESPs today.

Key takeaways

List hygiene compounds: without processes to sunset dormant contacts, a growing share of your list stops engaging — and some addresses can eventually become recycled spam traps.
Re-engagement windows depend on send frequency; for roughly weekly sends, ~180 days is a common starting point for dormancy, often with a short series of escalating win-back touches before suppression.
Sender reputation sits on both IP and domain; domain reputation is gaining weight (especially at Gmail), so swapping IPs alone is rarely a full reset.
Google Postmaster Tools, Sender Score, and blacklist checkers (e.g. MXToolbox) help monitor health; deeper ongoing monitoring may need a paid deliverability platform.
Not all blacklists are equal — major listings (e.g. Spamhaus) are serious; smaller or transient listings may have limited impact. Prevention beats remediation.
Checkout and pop-up consent should match jurisdiction (US vs CASL/GDPR-style markets); invisible force-subscribe maximizes list size but can spike complaints and hurt engagement.
For many eCommerce programs, single opt-in plus a fast welcome send can surface typos and bounces early; opens alone are an imperfect engagement signal.
Authenticate with SPF and DKIM (and align DMARC where appropriate); SPF has DNS lookup limits when many tools send from your domain — plan subdomains or consolidation if you hit caps.
Gmail category tabs are largely algorithmic; “move to Primary” campaigns rarely move the needle — focus on engagement and relevance instead of tab-gaming.