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RE: why isn't command expansion deferred?? (stupid question probably)

From: Paul Smith
Subject: RE: why isn't command expansion deferred?? (stupid question probably)
Date: Sun, 31 Jan 2010 20:12:32 -0500

On Sun, 2010-01-31 at 17:04 -0800, Mark Galeck (CW) wrote:
> I see, thank you for explaining!  How does your server know I reply to
> an "unrelated thread", when I change the subject line??

Only the weakest email clients do threading via the subject line: it's
far too arbitrary and error-prone :-).

If your mail client has an option to view all headers, or view the
message source unfiltered (I know things like Microsoft Outlook cannot
do this) you should take a look sometime.  There are LOTS of very
interesting headers in a typical email message.

One of them is a Message-ID: header which contains a globally unique
string which identifies this email from all others.

Another is a References: header, which contains a list of Message-ID
values that your message is replying to.  Whenever you reply, the new
message you created contains in a References: header which is a copy of
the References header from the message you're replying to, plus the
message-ID of the message you're replying to, so it grows as threads are

This is how all right-thinking email clients construct threads.

 Paul D. Smith <address@hidden>          Find some GNU make tips at:            
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

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