What is the difference between MAIL FROM: in SMTP and From: in the mail message itself?
The difference between MAIL FROM: in SMTP and From: in the mail message as follows:
The MAIL FROM: in SMTP is a message from the SMTP client that identifies the sender of the mail message to the SMTP server.
The From: on the mail message itself is NOT an SMTP message, but rather is just a line in the body of the mail message.