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From: glenn@heaven.woodside.ca.us (Glenn Reid)
Newsgroups: comp.sys.next
Subject: tidbit about Read Receipts in Mail
Message-ID: <386@heaven.woodside.ca.us>
Date: 2 Jan 91 08:31:24 GMT
Reply-To: glenn@heaven.woodside.ca.us (Glenn C. Reid)
Organization: RightBrain Software, Woodside, CA
Lines: 38


I was poking around with Mail.app today trying to figure out how it
encoded the request for a Read Receipt (2.0 feature in which you get
notified when someone reads the mail you sent to them), and wondering
if it also would generate a receipt on a non-NeXT system (it does
not).

Here's what I found out, just in case you're curious or interested.
There's one line in the mail header that is slightly different if you
request a Read Receipt, and the receiving Mail.app must look for it
and generate the receipt if it sees the flag:

Header line without a request for a read receipt:

	Received: by NeXT Mailer (1.62)

Header line with a request for a read receipt:

	Received: by NeXT Mailer (1.62.RR)

[note the ".RR" indicating Read Receipt]

Unfortunately, Mail.app doesn't also include the standard delivery
receipt header line that would cause it to work with other UNIX
mailers as well.  I think the standard header is something like

	Receipt-To: glenn

if I recall correctly.

Just thought somebody else might benefit from this.

/Glenn

-- 
 Glenn Reid				RightBrain Software
 glenn@heaven.woodside.ca.us		PostScript/NeXT developers
 ..{adobe,next}!heaven!glenn		415-851-1785