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OutboundSync Help Center

Once you've created a block list, use this article to understand how it's working and make changes. If you haven't made one yet, check out the guide for whichever CRM  you're using. 

You can monitor the progress of your blocklists sync by viewing the count of items that have been synced 

, as well as the count that have not been synced from the list 

OutboundSync keeps a log of the contacts stored, which can be viewed by navigating to 

There you can search for specific blocklists or email addresses to view their status, sync date, and any associated errors that may have occurred.

Here you can view the details of those blocklists, including:

Below is a list of different statuses that occur when using the Blocklist feature:

Here's what it looks like in the application:

If any issues occur during blocklist sync, an error log will be displayed in the UI. Common errors include an 

. OutboundSync also automatically handles certain service-related errors from Smartlead, described below.

This error occurs when Smartlead's service is temporarily unavailable when OutboundSync attempts to process the request.

OutboundSync automatically retries sending the affected emails or domains using scheduled cron jobs.

If the retry succeeds, the error is automatically cleared from the blocklist.

None. The system will handle retries automatically. If the issue continues, check Smartlead’s service status or logs.

Unexpected token '<', "<!DOCTYPE "... is not valid JSON

This happens when Smartlead returns an HTML response (such as an error page) instead of valid JSON. This usually indicates a service hiccup or misconfiguration on their end.

OutboundSync identifies these as invalid responses and flags the corresponding emails or domains with a timestamped error.

The system repeatedly attempts to resend them on subsequent sync runs.

The timestamp ensures the system doesn't retry the same data in a loop without progress.

None. OutboundSync will continue retrying until the data is successfully processed. If this error is persistent for specific entries, reviewing Smartlead's response logs may help isolate the cause.

You may also receive an error if your account does not have access to the blocklists feature in OutboundSync.  If this is the case and you would like to upgrade, please contact 

 button to pause blocking anytime. You can later resume at any point.

 button. This action stops the blocklist from running and deletes the blocklist in OutboundSync. It does not remove contacts from the blocklist in your Sales Engagement Platform.

Removing email addresses or domains from the blocklist

If you change your filter criteria, you can remove email addresses or domains from the blocklist with the following steps:

Pausing campaigns in your Sales Engagement Platform.

Delete the blocklist in OutboundSync and your Sales Engagement Platform.

Update the source list in HubSpot or Salesforce.

Resume campaigns in your Sales Engagement Platform.

Remember to OutboundSync time to re-run your re-added blocklist. You can monitor your progress in the blocklist section of the application.

Block lists

Block list maintenance guide