>Both, actually. Declude JunkMail gets the "HELO" from the real HELO/EHLO >from the SMTP envelope. The method Declude JunkMail uses to obtain the >HELO, however, is the headers.
Ok, this is clear as mud....which is it, envelope or headers?
The SMTP envelope contains information about the E-mail that may or may not appear in the headers. The most common information is the true sender ("MAIL FROM") and the actual recipients (as they may be Bcc:s). There are several SMTP envelopes as the E-mail passes from computer to computer, but you can only access the true SMTP envelope on the current server.
However, some of the information from the SMTP envelope does go into the headers. The HELO/EHLO will appear in the Received: header.
So it *is* as clear as mud. :) The information is obtained from the headers, and is added to the headers from information that comes from the SMTP envelope. So the information Declude JunkMail gets is the same as the information in the SMTP envelope, but Declude JunkMail gets it from somewhere else.
It's kind of like asking "Did you get Joe's number from the phone company?" -- it kind of a silly question, the answer to which would not be obvious (no, you got the number from Joe, but he got it from the phone company).
Or is there a precedence, so in some circumstances it uses one and in others uses the
other?
It's a moot point, really, except for scholars. Declude JunkMail will get the same information from the SMTP envelope as it gets from the headers, unless a trusted mailserver lies (in which case you have bigger problems), or if an error occurs on the mailserver creating the headers (in which case you also have bigger problems).
-Scott
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