Yesware is an add-on for Outlook and Gmail that gives sales professionals everything they need to prospect, schedule meetings and follow up.
There are very few bugs and their email tracking is on point. You'll always know when someone opens or clicks a link in your email!
PersistIQ gives you the sales automation platform and outbound sales team to help small businesses set up their own outbound sales engine to get new clients.
If your budget is tight we'd recommend this tool. It's relatively cheap and still does the core job of email automation. Although we wouldn't recommend running large volumes through it. They also have a decent "email finder" Chrome extension.