RE: Sieve

> > Specifically, I know that PMDF and iMS (MTAs I've worked on) add
> > such a field,and I believe sendmail, qmail, MMDF, PP, exim, and even
> > Exchange do so as well.
> In Exim, it's a config item which is not enabled by default.
That implementation decision hinders proper operation of RFC2298-
compatible UAs.

-d