From: David Levine <levinedl@acm.org>
Date: Sat, 13 Oct 2012 23:00:39 +0000 (-0500)
Subject: Don't allow blind aliases with sendmail/pipe mts.  Before this change,
X-Git-Url: https://diplodocus.org/git/nmh/commitdiff_plain/59ae7b80f479fd5d406cd549f7740849bdc76dc0?ds=sidebyside;hp=59ae7b80f479fd5d406cd549f7740849bdc76dc0

Don't allow blind aliases with sendmail/pipe mts.  Before this change,
they would be fed to sendmail, which would reject them anyway.  This
change catches that in post and presents a more helpful error message
to the user (at the "What now?" prompt, if used).

A possible future enhancement might be, with sendmail/pipe, to expand
out blind aliases and put the addresses in Bcc: header fields, but
then the recipients would get messages with the Blind-Carbon-Copy
indication.  (Note that Dcc isn't supported with sendmail/pipe,
either.)

Just for information:  old spost fed the addresses of blind aliases to
sendmail, making them visible to all recipients.  Oops.
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