EHLO or HELO server.server.com
MAIL FROM: test@test.com (This determines the address to which bounces are sent. This is not the same as the from header, which is the email address shown in an email client)
RCPT TO: recipient@recipient.com (This command tells the SMTP mail server to who the message should be sent. This can be the same or different than the to header, which is the email address shown in the email client.)
DATA
SUBJECT:
Type Body of emails
.
QUIT