The Cost of Undelivered Emails for Businesses in the US: A Detailed Breakdown

Undelivered marketing emails can create substantial lost revenue because marketers send large volumes while inbox placement is not guaranteed: global deliverability figures cited in the article show 84.8% reach inboxes, 6.1% go to spam, and 9.1% are missing. Using U.S. estimates of 9.7 billion daily emails, average revenue of $0.11 per email, and 84.6% deliverability, the analysis estimates potential losses of more than $164 million per day and $59.5 billion annually, although impacts differ across industries based on revenue per email and deliverability performance. Major causes include damaged IP or domain reputation, missing SPF, DKIM, or DMARC authentication, poor list hygiene, low engagement, spam-like content, irregular sending volumes, and unreliable email-service infrastructure. Recommended practices include verifying and regularly cleaning subscriber lists, using double opt-in processes, authenticating domains, monitoring engagement and blocklists, gradually warming up sending volumes, maintaining predictable schedules, producing relevant content, and choosing dependable email-delivery providers; the article ultimately advises businesses to begin with a deliverability audit and develop an improvement plan.

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