Overview of the Email Pipeline
The Email Pipeline is the flow of email as it is processed by the email gateway. It has three phases:
- Receipt — As the email gateway connects to a remote host to receive incoming email, it adheres to configured limits and other receipt policies. For example, verifying that the host can send your users mail, enforcing incoming connection and message limits, and validating the message’s recipient.
- Work Queue — The email gateway processes incoming and outgoing mail, performing tasks such as filtering, safelist/blocklist scanning, anti-spam and anti-virus scanning, Outbreak Filters, and quarantining.
- Delivery — As the email gateway connects to send outgoing email, it adheres to configured delivery limits and policies. For example, enforcing outbound connection limits and processing undeliverable messages as specified.