What is a SMTP delivery?

About

Once a SMTP server received a envelope (ie message, sender and recipient), it will deliver it.

Type

There are two types of delivery:

• local delivery: The SMTP server is responsible for your domain email. The SMTP server acts as a Mail Delivery Agent (MDA). It will store them in the mailbox. Note that the mailbox may be:
  • a file
  • a database row
  • an HTTP endpoint
  • …
• remote delivery: The SMTP server will deliver it to its final destination, the Mail Delivery Agent (MDA) responsible for the emails. The SMTP server acts as a Mail Transfer Agent (MTA or relay)