As of 25th May 2018 the General Data Protection Regulation came into effect,  this has had a large impact on the way marketing teams and organisations can manage their consumer data. Any organisation using marketing automation tracking is required to ask consent of from the consumer as well as provide transparency on how the data will be processed.
Marketing automation is a very active segment of the CRM software market. Not only are new vendors entering the market, but existing market leaders are constantly innovating and delivering new product updates. Today, the majority of solutions can be split into business to business (B2B) and business to consumer (B2C) solutions. The two groupings are very different and so are their functional needs.
Constant Contacts is an email marketing service, created to strengthen email marketing practices of small businesses, associations, nonprofits organizations, etc. It offers WYSIWYG editor to create an email campaign, secure contacts list management, social stats reporting tools, images/texts import feature, real-time tracking of your email campaign, etc.
For example, if you set up an autoresponder with an interval of 24, and you receive an email from firstname.lastname@example.org at 8 am on Monday, the autoresponder will respond to his message immediately. If, however, email@example.com continues to email you throughout the day, the autoresponder will not send him another response for 24 hours after his initial email (in this case, 8 am Tuesday). If he emails you again after the 24-hour interval expires, he will receive an auto response.
I think this email also makes quite a brilliant use of responsive design. The colors are bright, and it's not too hard to scroll and click -- notice the CTAs are large enough for me to hit with my thumbs. Also, the mobile email actually has features that make sense for recipients who are on their mobile device. Check out the CTA at the bottom of the email, for example: The "Open Stitcher Radio" button prompts the app to open on your phone.
Use it as a lead magnet/free mini-course. You can also use an autoresponder as a lead magnet to attract new subscribers to your email list. This is commonly done in the form of a free “mini-course”, or a free “challenge”, which promises to deliver a series of emails containing lessons (or other valuable information) over the course of several days or weeks. There is a high perceived value with a mini-course or a challenge like this, which makes it a very effective lead magnet.