Mailjet

At Channels, we use Mailjet as our go-to email marketing software. Mailjet is a fairly simple tool that doesn't make email marketing more complicated than it should be. It has an intuitive interface along with all the analytic tools and options that a marketer may need. It's not as robust as some other alternatives but, at the same time, it's much cheaper than most of its competitors. All in all, it's a great tool for startups and SMBs for email marketing.