Knowing what newer solid email marketing platforms are out there will help you pick different options than some of the more commonly known ones. Sender.net is one of the newer email marketing platforms which just got a WordPress plugin that also has integration for WooCommerce.
After you have installed and activated the Sender.net plugin you will need to have a Sender.net account. Enter the company name, email address, and then set the password for your new Sender.net account. You will need to check your email for the verification emails and you should also verify the domain.
The next step will be to create a new API token in your Sender.net account and then copy that token into the plugin settings.
If you have any groups created in Sender.net then those groups will show in the plugin settings and those can be used to selecting which groups you want to send based on the customer types. For more information on the WordPress plugin, you can read this help article. If you are using the WooCommerce plugin on the site then this help article covers all of the options that can be used. The reason why you would want to use Sender.net with a site running the WooCommerce plugin would be abandoned cart emails.
Sender.net also includes automation so that you can create a number of workflows for your site domain. The Sender.net email marketing platform very feature complete and the pricing is very hard to beat.