[Mimedefang] sendmail spf milter plugin for sendmail 8.13.0

[David F. Skoll]

On Wed, 18 Aug 2004 Matthew.van.Eerde at hbinc.com wrote:

> Ehhh... DomainKeys can be trivially saved from this trivial defeat.
> Just have the sending MTA create separate envelopes for each recipient.
> Then add an X-Envelope-To: header.  Finally have the MTA sign each envelope
> independently before delivery.  The X-Envelope-To: header will be part of
> the digest.

> On the receiving side, any RCPT TO: <> X-Envelope-To: invalidates the
> DomainKey check.

This then breaks forwarding, one of the advantages of DomainKeys over
SPF.

--
David.