Which function allows Mendix apps to send emails to users?

The function that allows Mendix apps to send emails to users is the 'Send Email' Action. This action is specifically designed for email communications and provides the necessary capabilities to configure the email message, such as setting the recipient, subject, body content, attachments, and more. It fits the requirement for sending emails directly to users within a Mendix application.

In contrast, the other options serve different purposes. Push Notifications are typically used for sending alerts and updates through mobile apps or web push notifications, which are not the same as email communications. The 'Email User' Action, while it suggests the concept of emailing a user, does not exist as a standard terminology in Mendix, leading to confusion about its applicability. The 'Notify User' Action also does not directly correlate with sending emails, as it's usually meant for in-app notifications rather than external email communication.

Therefore, the 'Send Email' Action is the correct function for enabling email functionality in Mendix applications, providing developers with a straightforward method to communicate via email to users.