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 Experts.

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


Retailers, failure isn’t an option: Clarify your email strategy with a free webinar on July 19.

Email deliverability is tied directly to retail businesses’ financial success. If people don’t see your emails, they can’t click your emails, and thus, cannot purchase things from you. Bad news. When you consider you likely require log-in to complete a purchase, if they don’t get that password reset or any other critical UX components (think […]

Navigate through the email jungle with the 250ok Deliverability Guide.

We get it. We’re email deliverability nerds, but you (likely) aren’t. If you are, that’s awesome and we should be pals. But if you’re not, that’s okay, we’re still here to support you in all your email efforts. How? By giving you the map you need to be confident you’re sending your marketing and transactional […]

Introducing 250ok Prospect: World-class customer vetting and sales prospecting.

We’re back at it! Today we’re excited to unveil the latest addition to the 250ok suite: 250ok Prospect. Since some of the 250ok team worked at email service providers (e.g., ExactTarget/Salesforce, Marketo, Adobe, Oracle, SparkPost, SendGrid), we know one of the most significant challenges they face is gaining insight into customers that have not yet […]




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