I'm the founder of a cold email lead generation agency. While the business is thriving, we're struggling to scale further with our existing email analytics tool smartreach.io. We currently manage 500 email accounts through their service and maintaining and uploading campaigns has become a real struggle (it can sometimes take up to 2h only to upload campaigns). Source: over 1 year ago

If you don't want to spend crazy shitload of money. Then install the ProspectDaddy chrome extension. It's free. Use this to prospect business email id's from LinkedIn. Example: Search for VP Marketing and set location to Denver, you get search results, at a simple click you'll get the freaking emails. They target using outreach tools. We use Smartreach and pay approx 99 bucks for 5 accounts. This way our lead... Source: almost 2 years ago

Use a third-party service like callrail or calltrackingmetrics. There are many competitors to those two as well to pick from. Source: about 3 years ago