www.campaigner.com (Not Free - But 30 Day Free Trial): A well priced and one of the most versatile autoresponder and email marketing online tool available in the current market. Has more than 500 email templates, mobile and social network ready and can give you detailed reports to measure the effectiveness of your email marketing campaign effectiveness. .
Pay attention to the amount of inbox storage available, because once you reach the cap, you’ll have to  start deleting messages in order to receive more. Many free email services offer a terabyte or even unlimited storage, which is helpful if you tend to receive messages with large attachments, like image and video files. However, even a few gigabytes of storage gives you enough space to hold between 100,000 and 300,000 messages.
While pricing varies by provider, the cost structure is usually the same. Most email marketing providers charge a monthly fee based on contact list size, with a range of packages and plans. With this structure, most providers allow you to send out an unlimited number of emails each month and have enough different plans to fit into the budget of any business. 
Robly's OpenGen technology utilizes a traditional email campaign process; however, OpenGen then resends your campaign one to 10 days later, with a different subject line to those subscribers who didn't open the first campaign. The system sends emails one at a time, at the moment subscribers are most likely to check their inboxes. The service features A/B testing, a pop-up widget to increase contacts and mobile-responsive templates.
Pay attention to the amount of inbox storage available, because once you reach the cap, you’ll have to  start deleting messages in order to receive more. Many free email services offer a terabyte or even unlimited storage, which is helpful if you tend to receive messages with large attachments, like image and video files. However, even a few gigabytes of storage gives you enough space to hold between 100,000 and 300,000 messages.
We narrowed the 16 free email services to eight that we believe are the best options. We eliminated services that allow you to send free email messages but won’t let you receive messages without purchasing the service. We also discounted services that currently have free email accounts available but are either no longer offering support or have plans to discontinue them. We didn’t feel comfortable recommending a service that may not be around long term.

MessageGears is a hybrid email marketing system that combines the security of an on-premises system with the scalability of the cloud. The service connects directly to any local or remote database, data warehouse, e-commerce system, or content management system. There is no need to extract, transform, or load customer data into the system or to move or replicate data. Features include subject line previews and testing, spam testing, and automation, drip and trigger campaigns.
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