What action does a server typically take upon successfully receiving the MAIL FROM command?

When a server successfully receives the MAIL FROM command, it indicates that the sender's email address has been provided, and the server is now prepared to receive the recipient address. This sequence follows the procedure defined by the Simple Mail Transfer Protocol (SMTP), where the MAIL FROM command is the initial step in the process of sending an email.

Upon receiving this command, the server acknowledges the sender’s address and, instead of performing actions like sending a confirmation message or checking for spam, it moves on to the next step in the communication process, which is to wait for the RCPT TO command. This is essential for establishing the routing of the email, allowing the server to know where to deliver the message.

By getting ready to receive the recipient address, the server ensures a structured and efficient exchange of email messages, maintaining the flow outlined by SMTP regulations.