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MailChimp is great for advanced customization using their API and integration with 3rd party services. MailChimp is one of the best email marketing service provider in the industry. Some of the email templates included withMailChimp are not responsive (compatible with mobile devices). It allows you to create and send email newsletters to customers, manage subscriber lists, and track campaign performance. MailChimp automatically takes care of signups, unsubscribes, and bounce-back cleaning. Email Editor has a drag-n-drop, rich text editor to design your email templates with ease.
MailChimp Pricing: Free for sending 12,000 emails to 2,000 contacts; from $10/month for unlimited emails to 500 contacts. If you are not a frequent sender, you can purchase credits that work like stamps for email. Like, for 300 email credits, you prepay $9 i.e. $.030 per email.