What command is typically used for delivering emails within the SMTP protocol?

The command that is typically used for delivering emails within the SMTP protocol is "MAIL FROM." This command is essential as it specifies the sender's email address in the SMTP transaction. By issuing this command, the SMTP server recognizes who the email is coming from, which is a crucial first step in the process of sending an email.

This command is part of the SMTP's initial handshake phase and is followed by other commands that help route the email to the correct recipient, ensuring that the message is transmitted properly. It establishes the context of the message, allowing the server to manage the email according to its policies and prevent issues such as spam.

Consequently, this command plays a foundational role in the SMTP protocol, ensuring that the sender's identity is conveyed, which is vital for email delivery and handling.