So, does requiring the copying earlier on increase costs unacceptably?
If you haven't seen the discussions in other forums, from experience this is
one of those religious ones that generates much heat. Especially in the "my MTA
is better than your MTA" battlegrounds. I'm merely raising the flag.
I'm not entirely sure I understand what's being discussed here,
but if you had to resign each message for a different rcpt-to,
you'd significantly up the cost of signing for things like
forwarders and exploders. The cost of RSA signing is still
not _completely_ insignificant.
ietf-dkim mailing list