Quoting Tom Kistner:
>> ok, but spool_mbox has nothing to with received headers, so I wonder why
>> Tom used received_for there, when $recipients is available and doing the
>> right thing.
> SA can pull some information from Received: headers. Exim only adds its
There's some information in
http://wiki.apache.org/spamassassin/EnvelopeSenderInReceived (even
though it's mainly about envelope sender). This will not work if there
is more than one recipient, but SA also uses various headers, e.g.
X-Envelope-To, so this one should contain the full recipient list, I
think. Otherwise it's useless, because it contains the same information
as the Received header.