If my IP is blacklisted or blocked by a specific ISP, will 250ok alert us?

Blacklist can only monitor public sources of data. This means private ISP blocklists, such as Comcast, Yahoo!, AOL, etc. cannot be queried for you to be alerted; however, that is one thing the Inbox can (potentially) identify. For example, sending to the seedlist and seeing mail as ‘Missing’ at an ISP means you should check your log files. If mail failed, it would likely be due to a blocking issue. If mail was delivered (and your mailserver received a 250 Ok), there is the possibility the ISP deleted it before placing it into a mailbox (amongst other potential possibilities such as internal delivery delays, an error on our side, etc.).



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