Raphael Bauduin <rblists@???> (Mo 23 Mär 2009 11:25:30 CET):
> 2009/3/23 Heiko Schlittermann <hs@???>:
> > Hi,
> >
> > If your users have a well working MUA and deliver the mails via SMTP
> > you never ever should see BCC headers. And I'd say, even for local
> > delivery you can't rely on the MUA setting a BCC header.
>
> If it's not in the headers, is it available in another way?
> The MUA transfers the mail 1 time to Exim, which then handles the
> distribution to recipients, including BCC recipient. So the info is
> there in the communication between the MUA and exim. Is it possible to
> get to it in a way?
The MUA tells exim a list of recipients (SMTP via RCPT TO, local via the
command line) and exim by no means knows if the repients are considered
to be "bcc" or anything else. From the MTA (exim) they are just
recipients, nothing else.
The MTA ist just transporting the message. In an ideal world the MTA
does not need to access the header part of the message, in this ideal
world the MTA does not even need to know any special format of the
message.) Of course, the last sentences are not true, the MTA accesses
the header part (counting Received: lines, adding own Received: lines,
applying some sanity checks, doing some header rewriting). But after all
- I'd consider it a bug in your MUA if there is a BCC header with any
contents.
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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