The following sentence made me wonder the first time I read it,
and it is probably not meant that way:
Vacation responses are not just per address, but are per address
per vacation command.
How about:
Vacation responses are not just per address, but are per address
per reason string.
If explicitly specified the subject should also be included in this.
Another point we should make is that the hash needs to be computed on the
strings before variable substitution has taken place. This introduces a
reference to the variables draft, but I believe it is informative, not
normative.
Ned