I'm setting up SquirrelMail-1.4.3a here talking to a courier-imap
server on localhost.  The IMAP's been working fine for IMAP clients,
and squirrel's been working fine for my handful of test users (many
messages in many folders).

One of my users noticed this major problem using SquirrelMail which
prevents him from reading mail.  We let our users read via POP or via
IMAP (both daemons access the same Maildir backend storage on a NetApp
over NFS).  This user has about 5000 messages in his INBOX -- he uses
POP but doesn't have his client delete the mail from the server, kinda
like normal IMAP usage but he of course doesn't get to manage
server-side folders.

When he tries to get his mail through SquirrelMail, it hangs for a
minute or so, then reports the following error:

  ERROR : Could not complete request.
  Unknown response from IMAP server: 1.* NO Cannot open message 1 * NO Cannot 
  open message 2 * NO Cannot open message 3 * NO Cannot open message 4 * NO 
  Cannot open message 5 * NO Cannot open message 6 * NO Cannot open message 7 
  * NO Cannot open message 8 ...

and on it goes for hundreds of message numbers.  

We're going live with this shortly and have quite a number of other
users who will be transitioning from an old POP server and will be
using this service in POP mode (instead of IMAP with folders) and may
encounter the same problem when they use Squirrel for webmail.

I've looked at the docs BrowseProblemsBy* and KnownBugs and Searched
the problems page for "unknown response from imap" but no joy.  The
server doesn't have tcpdump right now and Solaris' built-in "snoop" is
too stupid to sniff the loopback interface I'm using for localhost.
Is there a way to log what Squirrel is saying and what IMAP is
replying to help track down this problem?

Any suggestions on what's causing the error? is Squirrel timing out
waiting for the response from the IMAP server? Something else? 

Suggestions on how to fix or work-around this problem?

Thanks.


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