The best thing about it is it has a free version and can be used by anyone. I have been using this tool for email marketing automation and it offers a range of integrations and it has easy to use interface

Its best platform in the market for automation of e-mails and quick responding to customers and resolving there issues. When using this you get the power of adding multiple mail ids and mailing to multiple accounts get easier. The AI functionality of this enables the users to enhence and improve there communication abilities.

Copernica support is quick to respond and always helpful. and They have one of the best lead tracking and email marketing tools, and most importantly the ability to add an infinite number of email accounts.