[Evolution] Offline message cache encryption with a Master Password?

[Ari El <ari reads gmail com>]

Recently I discovered gmail's new IMAP feature. The next minute I was setting
evolution up to access my gmail account. I noticed evo's google/imap account
cached thousand of messages (some headers, some full messages), and also
found that the cache is made persistent even with me *not* selecting "mark
for offline reading". Meaning that if I close evo, then reopen, at first I
get asked for the imap server password, but even if I dont enter it, I can
see the full local cache of the imap folders and all recent message
contents.

I don't like this. 

Is there a way to force evo to encrypt the local cache (imap account and
also the exchage account if possible), so that I get asked for a password to
open the local cache (or better, the default gnome keyring could be used)?
any hint on how to do this?

TIA
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