If I send mail through the mail server of isp.example.com and they
sign with
my key, it matters a GREAT deal to me if they also sign other
people using my
name with my key. This may be largely an operational question, but
the
protocols have to support getting a reliable answer to it.
It isn't your key. It is example.com's key. They *may* mark your name
in an i= option, but they may not. The i= field is really something
that the administrative domain puts in for its own purposes (which
may very well tick you off).
Jon
_______________________________________________
NOTE WELL: This list operates according to
http://mipassoc.org/dkim/ietf-list-rules.html