About

Sender Index is owned and operated by Return Path. We know email and we’re here to inspire your email marketing.

Sender Index is an abbreviated version of Return Path’s Inbox Insight, which empowers marketers with competitive intelligence. Inbox Insight allows you to search emails from across industries and campaign types for creative inspiration coupled with performance metrics to improve your email strategy.

Want to know more about Return Path? We’re the expert in deliverability and driving results for your email marketing. Every day, our customers trust our data and insights to help them optimize their email marketing. Partnered with best-in-class email service providers, we help marketers take their email programs to the next level by driving more response and increasing revenue.

Through the Return Path Data Exchange, we’ve brought together the world’s most comprehensive source of data from the email ecosystem. We partner with more than 70 providers of mailbox and security solutions, covering 2.5 billion inboxes—approximately 70 percent of the worldwide total. Also feeding into this data platform is our consumer network of more than 2 million consumers, delivering unparalleled insight into user behavior, brand affinity, and consumer preferences.

Through the Return Path Data Exchange, we’ve brought together the world’s most comprehensive source of data from the email ecosystem. We partner with more than 70 providers of mailbox and security solutions, covering 2.5 billion inboxes—approximately 70 percent of the worldwide total. Also feeding into this data platform is our consumer network of more than 2 million consumers, delivering unparalleled insight into user behavior, brand affinity, and consumer preferences.

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Find out how Inbox Insight's competitive intelligence can help you optimize your email strategy.

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