Easy to install and create multiple emails campaigns. It can manage content and send multiple emails for branding. Pricing is not too much high and 24/7 Support team by experts. Have advance feature for sending and receiving emails. Generate multipurpose template for business and generate leads.

What I like best about Interspire Email Marketer is its a self-hosted solution that can be installed on your own server. Saves you the monthly maintenance cost VS paying for the amount of subscribers you have. Plug your own SMTP service / SMTP email service into the software and start sending emails and building list.

Though I have not used them for a couple of years, Interspire provides great email marketing, as well as their SAAS ecommerce platform BigCommerce.