performance issue (imap spool on san)

Rudy Gevaert Rudy.Gevaert at
Wed Jul 26 14:17:14 EDT 2006

Michael Loftis wrote:
> --On July 26, 2006 12:02:41 PM +0200 Rudy Gevaert 
> <Rudy.Gevaert at> wrote:
>> Hi,
>> I've installed the latest cyrus release and I'm having trouble with large
>> mailboxes.
>> I was going to try if the 4Gig limit is gone and I'm filling up a mailbox
>> with mails.
>> If I open the mailbox trough mutt it gets loaded at a acceptable
>> (lighting fast) speed.  However when using thunderbird it gets very slow,
>> I haven't been able to open the mailbox of 294M.
> This is a thunderbird problem, not a Cyrus problem.  Thunderbird is NOT 
> an IMAP client.  It's a POP3/NNTP reader, that's been taught to badly 
> parrot IMAP.  It attempts to download and locally index *all* headers.  
> This means that for large mail stores, it'll take a LONG time to figure 
> out whats going on, and lots and lots of RAM too.  And this is all on 
> the Client.

Thanks for your reply.  It's always nice to have a second opinion. 
Kmail opened the mailbox without a problem.

> Your SAN is fine, your client is the problem.  Unfortunately since 
> Cyrusoft went under (they made Mulberry) aside from Mutt and Pine I 
> don't really have any suggestions for loading large mailboxes.

To bad Mulberry has been discontinued.  I haven't used it before.

Kind regards,


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