We have a website full of registered users.
Each user works for various companies.
We'd like to manage our email list of contacts by certain companies, so that ALL users in company A do not receive certain emails.
Is this possible?
You can read the API documentation for details here:
The short answer to your question is yes. You can segment your registered users into contact lists that meet your requirements, such as Company A list. Email campaigns are sent to contact lists, not individual contacts. Each account can have a max of 1000 lists.