Matthias,
> > The cleanest way to differentiate mail submitted from inside
> > from inbound mail is to provide a dedicated mailer (MSA) for
> > mail submission, which accepts only authenticated mail or mail
> > from internal networks. All mail from such MSA can then be
> > passed to amavisd on a dedicated TCP port, where a policy bank
> > can set the originating flag to 1.
> you were right. I had to introduce a policy bank which uses the
> originating flag:
>
> # policy bank to have mails DKIM signed
> $policy_bank{'ORIGINATING'} = {
> # indicates client is ours, allows signing
> originating => 1,
> # force MTA to convert mail to 7-bit before DKIM signing
> # to avoid later conversions which could destroy signature:
> smtpd_discard_ehlo_keywords => ['8BITMIME'],
> # forward to a smtpd service providing DKIM signing service
> # (if using a signing milter instead of signing by amavisd):
> forward_method => 'smtp:[127.0.0.1]:10025',
> };
>
> # Use ORIGINATING policy to enable DKIM signing
> $interface_policy{'10024'} = 'ORIGINATING';
>
> So far it seems to work. Is there anything wrong with this solution?
Yes, that's what I had in mind. If you tested it and it works with
your MTA setup, than this is it. I just wasn't sure / don't know how
you are interfacing sendmail with amavisd, which can influence
a choice of solutions.
Mark
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