Michael Haardt writes:
If Sieve makes that promise, yes, but that's not what I was talking
about. I didn't talk about a privacy feature, either, but about a
convenience feature, and that's why I don't have a "privacy/security
issue".
It's a privacy/security issue the moment a user misunderstands, and
relies on the feature.
FWIW, I also don't like the idea of sieve managing folder
properties. That seems to be out of scope for sieve.
That's a point I can understand. If Sieve focuses only on messages,
then manipulating persistent folder attributes would be simply out of
scope. Does it focus strictly on messages, not folders, despite
folders containing messages?
Yes. Sieve ignores folders almost entirely. (Except that fileinto may
create a folder.)
If so, how about message attributes to allow expiration to happen?
Much better.
Such attributes are called annotations in IMAPspeak, and they're
supported by the ANNOTATE extension, which is itself still a draft and
not terribly widely implemented. If there isn't yet a sieve extension
to set a message annotation, there certainly should be.
Arnt