What information is typically included in an SMTP DATA command?

The SMTP DATA command is used to send the body of an email message as part of the Simple Mail Transfer Protocol (SMTP) communication between mail servers. Within this command, the primary component is the email message body itself, which includes the content that the recipient will read. This section can contain various elements such as text, images, and formatting, often structured according to the MIME (Multipurpose Internet Mail Extensions) standards.

The reason this choice stands out is that while the subject line is an important part of the email header, it is not included within the DATA command itself; it is typically transmitted in a separate HELO or MAIL FROM command. Other components like the sender’s IP address or the SMTP version are not part of the DATA command either. The IP address may be referenced in the SMTP communication but is not sent as part of the email content itself, and the SMTP version is part of the server negotiation process, not the message body being transmitted. Thus, the inclusion of the email message body is what defines the correct nature of the SMTP DATA command.