With a newly redesigned email editor, which makes it easy to pick back up on draft messages right where you left off or turn them into drip messages, AWeber is an email marketing app that does it all. If you need a professional email tool that’ll help you grow your lists and offer live phone support if you get stuck, it's a great email app to try. - Matthew Guay
Email marketing is such a critical component of business for most companies (with the rare exception) because you able to communicate with your audience in the place they spend a good chunk of time (their inboxes). You also have the added benefit of building an asset (an email list) that no external platform (I’m talking to you Facebook) can mess with.
Alex GetResponse is a good service too. They have a smaller customer base than MailChimp or Aweber but they are definitely on the right track. You should consider your own options that will help you decide. For example, pricing, growth, support, reliability, deliverability, spam filters, etc. Make a list of these factors to compare on your own, you will also find such analysis around the web but those analysis could be biased towards one of the service. So you better do it on your own.
The Autoresponder 2.0 is probably the most advanced feature that GetResponse launched a couple of months ago. With their new autoresponder feature we can now create message cycles that are timely and relevant — all adjusted precisely to subscriber needs and expectations and send them automatically. As a result the open and click are higher and hence lead to more conversions. - Ram Shengale
Think about implementing referral links to incentivize your subscribers to spread awareness about your brand, too. Referral links allow your current customers to promote trackable links for your business. In exchange for sending new paying customers your way, you can give them incentives like discounts, coupons, vouchers, cash, prizes or redeemable points.