Everything email, under one roof.

Achieve world-class email performance, simply: manage consumer engagement, inbox placement, sending reputation, design, and DMARC, all with 250ok.


Expert Services

Need help? Our strategists solve deliverability problems other consultants didn't even know existed. Click here to find out more about 250ok Services.

100% Personalized

The 250ok experience is personalized for each customer, from reporting dashboards to custom Slack alerts. Set it and forget it. Focus on what matters to you, noise-free.

The Complete Solution

Inbox testing. Blacklist monitoring. Global spam trap network. DMARC compliance. If it's a meaningful KPI, you can measure it with 250ok.

Why are top marketing programs making the switch to 250ok?


Real Email Intelligence

Combine data from all of your ESPs and 250ok within a single UI and behold your new email brain center. Slice and dice all of your data in complete granularity and at blazing speeds. As our retention rate shows, once marketers gain access to this level of email intelligence, there's no going back.

Optimized Seed Testing

We offer extensive global seedlist coverage; but the difference is 250ok's patent pending Seedlist Optimizer - a tool that creates list-specific, weighted testing and reporting of how your mail performs against global spam filters at the mailboxes you send to, not the one's you don't.

DMARC Dedication

Return Path sold their email fraud protection division to Proofpoint in 2016. While they now resell the Proofpoint offering, we control and continue to enhance our 250ok DMARC product. You can see us listed on DMARC.org, and our very own Paul Midgen was a co-author of the original DMARC spec.

Do you need email certification and panel data?

Old-school solutions to modern challenges are not a recipe for success. That's why we love debunking sender mythology — so you don't get burned.


Myth #1: Everyone Needs Email Panel Data!

No, everyone sending commercial email today already owns the most relevant panel in the world: the people they're sending mail to. With currently available panel offerings there is no statistical significance for most senders and the data is often misleading and hazardous given its severe biases.

Myth #2: Email Certification is a Smart Investment!

For most senders – not all – the juice is no longer worth the squeeze. Cert won't help you at Gmail, the largest mailbox provider in the world. Based on changes in the modern email landscape, 250ok customers combine best practices with expert services to achieve world-class performance.

Myth #3: Seedlist-based Inbox Testing is Dead!

While some vendors downplay the value of seedlist testing, do so at your own peril. Seeds are like spam traps: by the time the red flag goes up, there's already a problem. They are a critical component in testing perimeter defenses like blacklists, global spam filters, and reputation in general.

Resources for #SeriousSenders


Seedlist-based inbox monitoring 250ok Return Path eDataSource

Seedlist-Based Inbox Monitoring the Right Way

When sending commercial email, it’s important to understand what’s likely to happen the next time you send to a recipient at a particular mailbox provider. Are your messages hitting SPAM at Yahoo! or going missing at Comcast? Are you sacrificing ROI because you lack the proper visibility into performance? Seedlist-based inbox monitoring is a key […]

IP and Domain Warming, a Medieval Perspective

Marketers are often confused about the point of IP and domain warming, and they end up wondering: “Everything is authenticated, and I’m not using a blacklisted IP, so what’s the problem?” In short: senders who blast to their entire list without history look like spammers. Internet service providers (ISPs) can choose what to accept or […]

The Truth About Email Panel Data

We’re often asked about our stance on the use of email panel data. As senders, we want additional data points, visibility, and signals. In a perfect world, email panel data would enable marketers to compare their engagement to that of their competitors within a contextually relevant group of subscribers. Collected ethically and without bias, this […]




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