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Help CenterHubSpotUpdating block and exclusion lists

Updating block and exclusion lists

Last updated December 24, 2025

With OutboundSync, you can have any HubSpot list function as a blocklist or exclusion list, depending on which sales engagement platform you're using. You also know of these as Do Not Contact (DNC), opt out, or suppression lists.

These lists ensure that cold outreach is not sent to existing customers, competitors, open deals, or contacts on Do Not Contact lists.

Creating your list in HubSpot

Using lists in HubSpot means you can manage everything in one place, and push the right email addresses, email domains, and social profiles to the edge to prevent outreach.

If contacts have multiple emails in HubSpot, OutboundSync will block all associated emails in their contact record by default.

If you don’t have a blocklist built yet, let's create one now. Otherwise, skip ahead.

Need inspiration? Popular examples include lists for newsletter subscribers, open deals, and active customers.

Build a new list in HubSpot by going to Contacts > Lists.

Updating block and exclusion lists

Once there, click the Create List button to start creating a list.

Updating block and exclusion lists

For this you can either create a list that is Contact-based or Company Based

After creating a list with the desired criteria to add contacts or companies to an exclusion list, you can use it in OutboundSync for blocking.

Updating block and exclusion lists

Pulling your block list into OutboundSync

Now that you have created your list in your CRM, we need to pull that list into OutboundSync to start dynamically updating it in your Sales Engagement Platform. For this, we'll need to return to OutboundSync.

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Remember that the user performing these actions needs to have sufficient permissions. If the user cannot access this data in the CRM, their credential cannot be used by OutboundSync to perform this action.

Now, go to the OutboundSync app and go to the  Block lists  tab on the left.

Updating block and exclusion lists

Select your list

Search for the block list that you created. It can be either a contact list or company list in HubSpot.

Select Sales Engagement Platform API Key

Select the API key for the Sales Engagement Platform that you want to send to the block list. If you want to block this list on multiple platforms, create multiple lists. 

Updating block and exclusion lists

Select the type of blocking

OutboundSync supports two types of blocking. You can block by address or by domain with the Type of Blocking.

Address (individual email address or social profile)

Blocks each email associated with a contact in HubSpot individually and adds it to the blocklist in your Sales Engagement Platform.

Example: Blocking john@example.com doesn’t block all emails ending in @example; only John's email is blocked.

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HeyReach only supports individual social profiles on their exclusion lists. To understand more about how exclusion lists work in HeyReach, read  How to add an Exclude List to my Campaign?  and  How to Exclude (leads) from list? 

Domain (every email address)

Blocks all emails associated with a contact’s domain and adds the domain to the blocklist in Smartlead.

If a contact had multiple email addresses, every domain would be blocked.

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Exception: Leading email providers (e.g., Gmail, Outlook) won’t be blocked as they are common.  View unblockable domains list here. 

If you want to block these domains manually in your Sales Engagement Platform, download this CSV and import it directly. This would block you from emailing personal email addresses.

Select clients (Optional)

If you are using a Sales Engagement Platform that has specific client IDs like Smartlead, this is the step where you will select that Client ID to match the blocklist to that client. Others use dedicated workspaces where this will not be relevant.

Start blocking

Next, click Start Blocking (6). You will see your blocklist appear in the table.

Updating block and exclusion lists
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This takes time to execute. The larger your list, the more time it can take. Refresh your browser or come back later to see OutboundSync's progress updating your blocklist. 

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