1. Seventh Sense helps marketers and sales professionals reach the people that make them successful using artificial intelligence powered email.

  2. Monitor & analyze competitor email campaigns

  3. MailChimp is the best way to design, send, and share email newsletters.

  4. Email marketing software built for designers and their clients to run successful email campaigns.

  5. Edit the "subject" field when replying in Gmail!

  6. SC

    A free JSON API to check your email messages' spam scores

  7. All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.

  8. Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.

  9. Zoho Campaigns is an email marketing tool with CRM & social media integration to help you create, send and track effective email campaigns.

  10. Elastic Email is an all-in-one email delivery platform for both marketing and transactional email.

  11. litmus tests and tracks your email campaigns, so you can always put your best design forward.

  12. Business Class Email Marketing Software