About email in your Acquia Cloud environment
Your principal contact email is your default return address. The return path is included in the headers of all email sent by your website and appears as the address of the email sender. Email error messages are also sent to this address.
Acquia Cloud supports limited outgoing emails, such as Drupal registration confirmation emails and node subscription emails. Because the Acquia Cloud email servers are a shared resource, you cannot send mass emails (such as marketing messages or newsletters). You should use external email services for mass mailings. For more information, see Using a third-party email service.