Test inbox placement and spam filters
Preview your campaign on 30+ mail clients
Validate and optimize your content
Know if you're blacklisted
Monitor inbox, spam, and missing mail
Analyze opens, read time, and engagement
Track devices, platforms, and mail clients
Review spam filter and ISP diagnostics
Deploy and measure DMARC compliance
Analyze complaint rates with feedback loops
Record spam trap hits and phishing abuse
Monitor SPF and DKIM authentication
"250ok helps us quickly identify senders who may not be getting optimized delivery results. This way the team can focus on working with customers instead of reviewing piles of data."
Privacy Team Manager at Marketo
"Great group of people who really know the business inside and out. They have some of the most advanced and sophisticated features of anyone in the industry."
Senior Director of Deliverability, Maropost
"[250ok] provides reliable real-time information to help us keep our email flowing smoothly ... amazingly useful in identifying issues before they become big problems."
Co-Founder & CTO, MailerMailer
Tips on email marketing and email deliverability best practices