🚀 go-pugleaf

willis@evax0.eng.fsu.edu writes:
	<921217155244.22202e59@EVAX0.ENG.FSU.EDU> 
       I know that 921217 is the date and that 155244 is the time the message 
       was sent/received, but I don't know what .22202e59 means (given - I 
       knew the name of the sender from the other header information that was 
       excluded).  If there is some documentation or books around that 
       describe this example as well as other aspects of e-mail and e-mail 
       headers, I would be glad to find out how to access it.  Thanks in 
       advance.

You can ftp to nic.ddn.mil and look in the "rfc" directory, where you
should pick up RFC822, which is the overall reference for Internet-
compliant mail.

On the other hand, the exact contents of Message-Id headers are
implementation-dependent.  There is no reason why a Message-Id must
contain time-of-day or anything else that's readily identifiable.  As
a practical matter, and since the goal of a Message-Id is to give a
guaranteed-unique identifier, a combination of the date/time plus some
process identification information, for the process which created the
message, is typically used.  Hence, if you're on a UNIX system running
(e.g.) sendmail as a mail transport, the "22202" is probably the UNIX
process id of the sendmail invocation which took care of the message.
I can't place the "e59" portion, however.

--karl