Unfortunately, with IMP 4.x we are limited to the API provided by
c-client/PHP imap module. This API is *horribly* inefficient and does
all sorts of terrible IMAP things that are
unnecessary/inefficient/embarassing. So it is conceivable that the
entire mailbox is scanned when a mailbox refresh occurs.
I discussed this with our network administrator and he is not convinced since we weren't seeing this problem prior to the migration to Dovecot a couple of weeks ago (and the last time the user was seen logged in prior to last Thursday when he reappeared and the problem started).
It's just peculiar that we are seeing a problem with only one user. I have a feeling that the corrupt cache files are related since no other user has triggered these messages.
Thanks.
-- Chris O'Regan chris@encs.concordia.ca Senior Unix Systems Administrator, Academic IT Services Faculty of Engineering and Computer Science Concordia University, Montreal, Canada