> This could be
done with a file on the server, since IMAP allows fairly free form
file retrieval,
Don't count on that. Only uw-imap thinks it's a file server. Most
servers will enforce at least minimal RFC2822 compliance on the data
they serve up, let alone accept via APPEND.
or it could be done with flags where the server permits
the definition of new flags.
Yes, and this is much more portable than the hack you describe above.
But beware of namespace issues. Twice (thrice?) upon a time I started
on a draft that would allow for a reserved-for-vendors chunk of the flag
namespace. I really should finish the damned thing.
I don't think there would be performance
issues with either option, but using flags is definitely better for
data integrity where the mail might be accessed by different clients.
You should also take a look at ANNOTATE. It's a lot heavier than using
flags, but gives you a lot more flexibility (when you have a server that
supports ANNOTATE, of course).
--lyndon
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