Pinterest eHarmony DraftKings Furniture Row Arsenal FC Adobe

Get advanced analytics on everything email.


All of the signals

A single email management platform

Build a customized email management solution.


World-Class Deliverability

Emails that don't reach the inbox are simply wasted opportunities. 250ok tracks every aspect of your email program to ensure that your messages reach your customers.

Expert Services and Support

You won't find any junior-level script readers here. Ask for examples of deliverability issues 250ok diagnosed, triaged, and quickly resolved after other competitors failed.

Complete Customization

Live outside the app with custom email, SMS, Slack, HipChat, PagerDuty, and webhook alerts. Set it and forget it. Focus on what matters to you, free of pointless notifications.

The 250ok Difference:



Us Them
International seed coverage at 100+ mailbox providers
Design integration with Litmus & Email on Acid
Integrated with major email service providers
Spam trap & phishing monitoring with alerts
In-house DMARC monitoring & guidance
Custom Email, SMS, Slack, and HipChat alerts
Compare performance across any campaign, device, or client
Full API or white label integration

Resources for #SeriousSenders


Deliverability 101: Brazil’s new privacy legislation is similar to the GDPR.

In August 2018, the Brazilian parliament passed Law No. 13,709, a new privacy law known as the Brazilian General Data Protection Law (GDPL), updating and amending the existing “Brazilian Internet Law” of 2014. This is another example of major global economies updating outdated privacy legislation to provide more consumer-favored legislation, similar to the GDPR. There […]

Poorly designed emails could cost you millions of dollars. But what does that really mean?

We partnered with the smart folks at Lab42 to research what people really think about marketing email. Do they like how they look on their preferred device? Do they prioritize the same design elements you do? If you’re not aligned with your recipients, you could end up sending unwanted, unsatisfying email. You know what that […]

How to properly use third-party data to grow your list.

There seems to be a lot of confusion and bad advice in the marketplace about growing email lists with the aid of third-party data sources. Some advice encourages you to rent or purchase data, then run it through an email validation service before your distribution to remove as much of the (potentially) bad stuff as […]






Ready to get started?