With the Postmark plugin for Craft CMS, you can reliably send both transactional and promotional emails without impacting each other's delivery. This is made possible by Message Streams, a parallel but separate sending infrastructure that supports bulk emails without affecting transactional emails. The plugin allows you to use Postmark as your default email service, selecting from various streams to send different types of emails, including newsletters and promotional messages. By integrating with Craft Campaign, users can also manage their email marketing campaigns seamlessly within the CMS. With reliable delivery and top-notch support, Postmark is a trusted provider for sending emails in Craft environments.