What is 250ok / Everest by Validity?
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Everest (formerly 250ok, now part of Validity) is an enterprise deliverability platform. If you've seen it mentioned in deliverability conversations and wondered who it's for: large B2C brands, retailers, and ESPs that need systematic measurement of inbox placement at scale.
The core thing Everest does that you can't easily replicate with free tools: seed-based inbox placement testing. They maintain a panel of real email addresses (seeds) at major mailbox providers. You include these seeds in your sends, and Everest tells you whether your email landed in the inbox, the spam folder, or didn't arrive at all. At Gmail, Outlook, Yahoo, Apple Mail, and others. This is the only way to measure inbox placement directly rather than inferring it from open rates.
The platform also bundles: Sender Score tracking (IP reputation), blocklist monitoring, DMARC reporting and management, email design previews across clients, and competitive benchmarking.
Enterprise pricing reflects the enterprise feature set. Everest isn't the right tool for a newsletter operator or a small marketing team. The inbox placement testing capability becomes worth the investment when you're sending at high enough volume that even a 5% improvement in inbox placement has real revenue impact.
If you're evaluating tools at this level, our free tools cover authentication checking and blocklist monitoring at no cost. DMARC parser, blocklist checker. For inbox placement testing at scale, that's where a tool like Everest earns its cost.
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