[imp] Re: Re: IMP Slow?

[Mike DiChiappari]

Thanks, I think I got it.  I'll probably give one of those other IMAP
servers a try - perhaps Courier.

Mike

"Alain Fauconnet" <alain at ait.ac.th> wrote in message
news:20040923032034.GE20453 at ait.ac.th...
> On Wed, Sep 22, 2004 at 10:48:57PM -0400, Mike DiChiappari wrote:
> > I am using the IMAP that comes with RedHat 9 (imap-20001a-18).  It seems
to
> > work very well from various email clients.
>
> That's  UW-IMAP.  I've  already explained to you why it may 'work very
> well from various email clients' and be slow from IMP,  but  I'll  try
> again:
>
> Regular e-mail clients (Outlook etc.) and IMAP-based  web  mails  have
> very different usage patterns of  the  IMAP  server.  Clients  keep  a
> single connection open. Web mails keep opening and closing sessions.
>
> UW-IMAP creates work  copies  of  the  opened  mailboxes.  With  large
> mbox-format mailboxes, this makes an IMAP open/close session operation
> very costly in disk I/O. Hence the *possible* explanation for what you
> are seeing.
>
> There  might  be  other  reasons,  like  an  IMAP  server started from
> xinetd.conf  that  does  reverse  identd  checks  to  itself (when the
> connection  comes from the web mail) that are blocked by your iptables
> rules.
>
> Greets,
> _Alain_
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