I mailed a duplicate campaign. Why is the duplicate 100% missing?

A 250ok Inbox test could show as 100% missing if it is a duplicate of a previous send, even if the send if from a different address. To remedy this issue, 250ok recommends implementing an x-header or HTML body tag to help identify your mail. Click here for more information on adding an x-header to your inbox tests.

Click here for more information on missing mail.

Open your 250ok Settings Menu and select “Contact Support” under Help Center or contact 250ok Support if you have any questions about missing mail.



BriteVerify email verification ensures that an email address actually exists in real-time


The #1 global data quality tool used by thousands of Salesforce admins


Insights and deliverability guidance from the only all-in-one email marketing solution

GridBuddy Cloud

Transform how you interact with your data through the versatility of grids.

Return Path

World-class deliverability applications to optimize email marketing programs

Trust Assessments

A revolutionary new solution for assessing Salesforce data quality


Validity for Email

Increase inbox placement and maximize subscriber reach with clean and actionable data

Validity for Data Management

Simplify data management with solutions that improve data quality and increase CRM adoption

Validity for Sales Productivity

Give your sales team back hours per day with tools designed to increase productivity and mitigate pipeline risks in real-time