Sometimes very little, sometimes a lot. Hubspot, for example, may charge 10X more than most email marketing tools but they offer an all-in-one marketing & sales platform that includes everything from landing pages and live chat, to a social media management tool and CRM. On the other hand, ActiveCampaign offers an enormous amount of value while remaining one of the most affordable email marketing tools on the market.

Thanks Kelly, Mailchimp have definitely come a long way with their UI over the years, it’s just their service that hasn’t caught up ;) I haven’t had the chance to play around with Pure360 as much as I’d like, but I’ve heard the same things echoed by several friends who use their service. Looking at their client list, I think they’re more aimed at large companies though.
Email marketing has evolved rapidly alongside the technological growth of the 21st century. Prior to this growth, when emails were novelties to the majority of customers, email marketing was not as effective. In 1978, Gary Thuerk of Digital Equipment Corporation (DEC) sent out the first mass email[1] to approximately 400 potential clients via the Advanced Research Projects Agency Network (ARPANET). He claims that this resulted in $13 million worth of sales in DEC products,[2] and highlighted the potential of marketing through mass emails.

Email marketing solutions run the gamut from basic text-based email editors to fully designed HTML or JavaScript templates. Leveraging email for marketing can take several forms, so some packages will attempt to address all of them while others will seek to specialize. For example, some businesses might decide their most effective marketing tactic is a value-add newsletter delivered to a gated community of subscribers. Others might want to tie their emails directly to their product and sales engines, providing special offers and deals to recipients.
What I most like about Rejoiner is the shared accountability over results. Many brands spend large sums of money on email marketing software, only for the accountability of results to be on their internal team. With Rejoiner, this is flipped on its head, where the company providing the software shares the responsibility for driving incremental revenue. 
However, as email marketing developed as an effective means of direct communication, in the 1990s, users increasingly began referring to it as "spam", and began blocking out content from emails with filters and blocking programs. In order to effectively communicate a message through email, marketers had to develop a way of pushing content through to the end user, without being cut out by automatic filters and spam removing software.
Woodpecker is an email tool that enables you to send cold email outreach and inbound lead nurturing email messages and follow-ups automatically, but one by one as if you were sending them manually. If you get a reply, further follow-ups are automatically stopped. Replies from different address, forwards and autoresponders are also detected. Personalize cold emails, track clicks and opens, and collaborate with your team.
I’m currently looking for an email marketing service for a mailing list of about 80,000 subscribers. I run an information product business in the fitness industry with a large number of customers buying our ebooks and online courses every day. I’m particularly interested in GetResponse, although I’d be keen to hear your thoughts on the flexibility of their service for creating autoresponders, and integrating with a checkout service (we use WooCommerce).
When people talk about email marketing, lots of them forget to mention transactional emails. These are the automated emails you get in your inbox after taking a certain action on a website. This could be anything from filling out a form, to purchasing a product, to updating you on the progress of your order. Often, these are plain text emails that marketers set and forget.
×