New Report Proves Apollo.io Beats Email Deliverability Benchmarks
Apollo.io's new Tolly Group report shows superior email deliverability and conversion rates vs. industry benchmarks. Breaking down why this matters for cold email teams.
Sarah Mitchell
April 10, 2026

Apollo.io released its 2026 Go-To-Market Effectiveness and Data Quality Report on April 8, an independently conducted evaluation showing that its AI-powered platform materially improves email deliverability performance and produces cold outreach conversion rates that exceed industry benchmarks.
The report carries weight because it was not produced internally. Apollo commissioned The Tolly Group, a well-known independent technology testing firm, to run a real "from scratch" live go-to-market campaign on the platform, contacting 384 target users at 205 companies over one month, with three full sequences completed for 169 contacts. That methodology matters: live campaign results are harder to selectively engineer than controlled lab tests.
What the Tolly Group Actually Tested
Beyond measuring outreach outcomes, Tolly used the campaign to evaluate contact data quality, AI feature benefits, the platform's user interface, and several other operational factors. The firm also ran a cost and feature comparison against Apollo's direct competitors, ultimately concluding that Apollo is the most cost-effective and simply priced solution and the only vendor in its peer set offering full-stack capabilities as standard.
Apollo's CMO, Marcio Arnecke, called the evaluation "exceptionally strong" evidence of platform value, noting that while customer feedback is constant, independent third-party testing is the most reliable performance indicator the company has.
Why Deliverability Is the Central Issue Right Now
The timing of this report is deliberate. Email deliverability has become measurably harder over the past 18 months. Gmail now enforces a spam complaint threshold of just 0.1% for senders exceeding 5,000 daily emails, with SPF, DKIM, and DMARC authentication required, and tightened enforcement in November 2025 means non-compliant senders face temporary or permanent rejection across all three major inbox providers simultaneously.
A good deliverability rate for cold outreach is anything above 95%, yet many outbound teams fall well short of that threshold. According to data compiled by Martal Group, improving deliverability alone can increase lead volume by 50% and reduce marketing costs by 33%. For growth teams running outbound at scale, that is not a marginal improvement.



