If I send mail through the mail server of isp.example.com and they
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
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).
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