I am working on a project where users can send emails to multiple recipients. The users will have their own list of email addresses, and they want to send a message like 'Hello world' to those addresses. The email can be sent from either a domain the user has set up or from my domain if the user hasn't set up their own.

Within my app, the user will select the recipients for the email. Is it possible to implement something like this? I assume there must be a solution since platforms like Beehive offer similar functionality.