Scan and validate your mailing lists to ensure ongoing delivery
Test your creative on 70+ mobile, tablet, and desktop clients
Test your inbox placement at 100+ mailbox providers
Measure the effectiveness and performance of campaigns
Monitoring & Alerts
Keep tabs on blacklists, spam traps, complaints, and more
Protect your brand by catching and rejecting unauthorized mail
Send custom, action-based alerts to email, SMS, Slack, etc.
Training & Onboarding
Getting up to speed or need a refresher? We’re here to help from the moment you get started.
Email Health Checks
Review all aspects of your email program including compliance, content, reputation, and more.
Have a question? We have answers. Lean on our experts for monthly insight and guidance.
Case Studies & Reports
New User Guide
In The News
SPF is a method to prevent email sender address forgery.
Enter a domain to view and analyze its SPF record:
Need assistance with SPF? See how 250ok can help.
Online Form - Request A Demo
Other free tools you might like...
IP Range to CIDR
CIDR to IP Range
Find out more.