--- title: How to Create an Exclusion List for Invalid Emails in HubSpot description: Build an active segment of Koalify-flagged invalid emails and use it to exclude bad addresses from every HubSpot send. Protect your bounce rate. --- [Skip to content](https://koalify.io/email-validation-knowledge-base/how-to-create-an-exclusion-list-for-invalid-emails-in-hubspot#main-content) ![koalify\_rectangle\_-Jul-20-2026-08-43-06-7935-AM](https://koalify.io/hs-fs/hubfs/koalify_rectangle_-Jul-20-2026-08-43-06-7935-AM.png?width=50&height=50&name=koalify_rectangle_-Jul-20-2026-08-43-06-7935-AM.png) Open main navigation Close main navigation - [GET STARTED FREE](https://api.email.koalify.io/hubspot/install?utm_source=koalify&utm_medium=knowledgebase&utm_campaign=navigation) [GET STARTED FREE](https://api.email.koalify.io/hubspot/install?utm_source=koalify&utm_medium=knowledgebase&utm_campaign=navigation) Search the Email Validation Knowledge Base 🐨 - There are no suggestions because the search field is empty. 1. [Koalify Email Validation Knowledge Base](https://koalify.io/email-validation-knowledge-base?hsLang=en) 2. [Validation activation](https://koalify.io/email-validation-knowledge-base/validation-activation?hsLang=en) # How to Create an Exclusion List for Invalid Emails in HubSpot ## Build an active list of contacts Koalify has flagged as invalid, then add it as an exclusion list on your marketing emails so you never send to a bad address again. These workflows use [custom properties that are created automatically by the Koalify – Email Validation app](https://koalify.io/email-validation-knowledge-base/koalify-email-validation-custom-properties-in-hubspot?hsLang=en). ### 1. Create a new Segment - In HubSpot, go to **CRM \> Segments (Lists)** - Click **Create Segment** - Select **Contact-based** - Give it a clear name, e.g. **Koalify Invalid Emails** ### 2. Set the list criteria - Add the filter: - Contact property → **Koalify – Email Validation Status** is **Invalid** - Click **Next** - **Save and process** as an **Active Segment** - With Koalify you can update the validation status automatically via [workflows](https://koalify.io/email-validation-knowledge-base/how-to-automatically-validate-hubspot-contact-emails-using-the-koalify-workflow-action?hsLang=en)or [CRM cards](https://koalify.io/email-validation-knowledge-base/how-to-validate-a-contacts-email-in-hubspot-using-the-koalify-email-validation-card?hsLang=en), so keeping the segment active keeps it current. ![How to create an exclusion list for invalid emails in HubSpot](https://koalify.io/hs-fs/hubfs/How%20to%20create%20an%20exclusion%20list%20for%20invalid%20emails%20in%20HubSpot.png?width=670&height=304&name=How%20to%20create%20an%20exclusion%20list%20for%20invalid%20emails%20in%20HubSpot.png) ### 3. Use the segment as an exclusion on your emails - Open or create a marketing email and go to the **Recipients** step - Under **Don't send to**, add your **Koalify Invalid Emails** segment - Because the segment is active, it updates before each send, so there's no manual maintenance needed ![Use the list as an exclusion on your emails](https://koalify.io/hs-fs/hubfs/Use%20the%20list%20as%20an%20exclusion%20on%20your%20emails.png?width=450&height=568&name=Use%20the%20list%20as%20an%20exclusion%20on%20your%20emails.png) Any contact on the list is now excluded from that send, protecting your bounce rate and sender reputation. - [Getting started](https://koalify.io/email-validation-knowledge-base/getting-started?hsLang=en) - [Validation card](https://koalify.io/email-validation-knowledge-base/validation-card?hsLang=en) - [Workflow validation](https://koalify.io/email-validation-knowledge-base/workflow-validation?hsLang=en) - [Validation insights](https://koalify.io/email-validation-knowledge-base/validation-insights?hsLang=en) - [Validation activation](https://koalify.io/email-validation-knowledge-base/validation-activation?hsLang=en) - [Account & billing](https://koalify.io/email-validation-knowledge-base/account-billing?hsLang=en) [![koalify\_rectangle\_long\_with\_name\_bold-1](https://koalify.io/hs-fs/hubfs/koalify_rectangle_long_with_name_bold-1.png?width=100&height=25&name=koalify_rectangle_long_with_name_bold-1.png "koalify_rectangle_long_with_name_bold-1")](https://koalify.io/?hsLang=en) HubSpot deduplication and email validation Copyright © 2026, Koalify