On Tue, Nov 17, 2009 at 01:12:26PM -0500, Wietse Venema wrote:
> > > Apparently, owner-foo works for email addresses but not commands.
> > > That would be a bug.
> >
> > It is not easy to solve, since bounces are not sent by local(8), so
> > we would need new a queue-file with "owner-test" as the new sender,
> > but there is no secure mechanism to record a command as the recipient
> > in the queue file.
>
> What about using the bounce_one() approach? local(8) already
> solved the notification problem with mail delivery loops that way.
It would be nice to avoid synchronous single-recipient bounces whenever
possible. With "Delivered-To:", we expect at most one such bounce per
current queue file, because the header in question is a message property.
With failure reasons other than "Delivered-To:" loops, I would prefer
to stick to indirect bounces.
So perhaps we can avoid this code-path when the command is the *sole*
(unowned) expansion of the original queue-file recipient address. Not
sure how expensive it would to keep track of this.
I am not a big fan of Sendmail-compatible alias semantics. Whenever
possible I arrange for *all* alias expansion to be indirect, by making
sure that $myorigin is not a local domain, and only suitably *rewritten*
(in virtual(5)) mail is handed to the local transport.
Command expansion poses a special problem in this respect, and the
"solution" is typically to wrap-up the command in its own alias, and
use its "external" (non-local) address when delivering mail to the
command and other recipients.
I do the same for non-command recipients also. So local(8) delivery is
always indirect at non-leaf nodes, and most lists are managed on input
via virtual alias expansion.
--
Viktor.
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