The Crucial Message-ID Field
An optional but universally implemented header field
This is a unique identification in the context of the handling mailer
There is no defined format for message ids, except that they be unique identifiers
Invaluable for determining the source of mailing loops
Examples:
GSJUORQXTW8Y4WV2@mr.gov.bc.ca>
�.aa13678@clb_sj.clbooks.COM>
ɚD3D6235@courier.sscnet.ucla.edu>
�.AA755405259@ccmail.orst.edu>
GUH93WL9WI9377KN@Arizona.edu>
HH17GNOB1U8WVYX1@CCIT.ARIZONA.EDU>