About me: A Received field added by each MTA in the email
delivery chain as it accepts a message for
transfer. Its a hack, and is functionally
incompatible with the Courier mail servers
internal message dispatcher. This is analogous to
the return address on regular mail. Email
construction and delivery is similar to regular
mail by design, because email is modeled on
regular mail. Email contains more detailed
information about its delivery process than the
single postmark of regular mail.