claus(_at_)faerber(_dot_)muc(_dot_)de (Claus Färber) wrote on 17.08.04 in
<9F2gGYpJcDD(_at_)gmane(_dot_)3247(_dot_)org>:
Philip Hazel <ph10(_at_)cus(_dot_)cam(_dot_)ac(_dot_)uk> schrieb/wrote:
1. Exim (which I maintain) removes Bcc: lines if, and only if, it is
called with the -t option. In that case, it is constructing an
envelope from the header data, and IMHO in doing so it is fulfilling
an MUA function. In all other cases it leaves Bcc: lines alone.
The /usr/[s]bin/sendmail interface is a proprietary interface introduced
by Sendmail. So all other applications providing this interface should
be as close to Sendmail's behaviour as possible, i.e. they should remove
Bcc headers.
... when using the -t option.
Philosophically, the mailers are still doing the MUA's job by sanitizing
the message and (finally) handling it over to the message router (MTA).
It just happens that that part of Unix MUAs is usually shipped along
with the MTA.
And in fact, it would be entirely possible to implement a
/usr/sbin/sendmail that implemented *only* that part of the functionality,
handing messages off to a separate MTA via SMTP or SUBMISSION.
MfG Kai