When the bounce rate in any campaign exceeds 25%, it is placed in the Suspended status. This makes it impossible to reactivate this particular campaign. You can only
duplicate the campaign and move prospects there.
The issue might be caused by low quality prospects with a lot of outdated or incorrect emails that can hurt your domain reputation and negatively affect your future campaigns.
To avoid this, we strongly recommend validating your contacts. You may use our validation service or any other service you prefer before launching your campaigns.