ActiveCampaign is one of the best because it combines email marketing and CRM features in one platform. A CRM, which stands for customer relationship management, is a system that keeps track of your contacts and your interactions with them. When your email tool and CRM are connected, you can send the right email to the right person based on what they have done, like clicking a link or visiting a page. HubSpot also does this well. What email marketing tool do you think works best when paired with a CRM?