I am a newbie. Could anyone clarify about the following issue?
I am aware that once a session for SMTP is established it could be used for
Let's say that there are two SMTP servers, A and B, and A initiates a
session (TCP connect to B). After A finished one transaction (transferring
some email content from A to B), is it possible B starts transferring some
email content to A using the same TCP connect? What is the command or
process like? Can B just use "mail from" after A sending its emails to B?