Re: qmail-ldap server is to "slow" - how to tune it?

[Darren Smith <darren.smith@odyssey-management-services.com.au>]

Claudio Jeker wrote:
> On Wed, May 16, 2007 at 04:55:30PM +0700, sato x wrote:
>   
> > Dear guys,
> >
> > I have a qmail-ldap server that running well, except for its speed.
> > When a client sends a message (a simple one with text only), it will
> > take about 8 seconds for the email to disappear from the Outbox (I
> > mean, the time needed for email to get sent).
> >
> > I tried to raise the number of users into 23, and sent email in the
> > same time (a couple times). The average time needed to send those
> > emails raised to 16, 25, 50 seconds. It even took over 1 minute for
> > some users. The receivers were local and remote (e.g., gmail.com).
> >
> >     
> For smtp deliveries qmail-smtpd is used and depending on the settings
> various DNS lookups and LDAP lookups are done. Slow behaviour is often a
> sign that either your DNS is not correctly setup (like only the secondary
> DNS server is working) or a problem with LDAP server (bad indexes or
> reverse DNS lookups that do not work). Also have a look at your rbllist
> file.
>
> Also try to use telnet and issue the various SMTP commands by hand perhaps
> you can identify which step takes way to long.
>   
Hi Claudio,

just thinking out loud...... in reading sato's original email, from his 
description it would seem that the issue lies from MUA to MTA which 
would mean that its unlikely to be qmail (sato could you confirm 
please?) - what are your thoughts?  He describes the mail sitting in his 
'Outbox' for a period of time.  This makes me think that he is using 
Outlook as a client and it is in the process of sending the mail to the 
MTA(qmail) via IMAP or similar.  Sato - is this true?  Also, could you 
try a different client like thunderbird and compare results?
Thanks

Darren