From: Gareth Bult (no email)
Date: Wed Aug 06 2003 - 05:58:07 EDT
Hi,
For what it's worth I have a similar setup (far fewer users) and have
started to experience a problem with ONE of the font end machines. This
machine runs AMAVIS with Postfix and delivers to the IMAP server via
LMTP.
All of a sudden I'm getting complaints from one Netscape user who is
getting server busy messages. The really strange thing is, the emails
are actually being sent (!).
It has been working fine for months and nothing much has changed... [?]
Gareth.
On Wed, 2003-08-06 at 09:09, David Hearn wrote:
> I hope someone can help me.
>
> I've recently (since Monday) deployed a
> postfix/cyrus/web-cyradm/amavis-new
> mail server for our company (40 employees). Everything seems to be
> working
> fine - except for one thing. We've had quite a few times where people
> in
> the office have been unable to send emails because the server is
> claiming to
> be too busy.
>
> Could this be because I don't have enough postfix processes to handle
> the
> load? I upped the MySQL max_connections from 100 to 300 after a heavy
> incoming spam 'attack' (which caused a lot of lookups) and MySQL
> didn't
> appear to recover after the spam session - all my destination lookups
> kept
> failing. No problems with MySQL after upping the max_connection -
> however
> we still seem to be getting some busy messages from Postfix still.
>
> In master.cf I'm using the basic maxproc settings (which appears to
> set
> default_process_limit = 100). I guess I could increase the number of
> processes for inet smtp to more than 100 - however, I don't fully
> understand
> how the other (lmtp/virtual/local + amavis stuff) interact - and
> therefore I
> don't know whether I need to increase any other limits when I increase
> the
> inet smtp maxproc.
>
> So - any suggestions?
>
> master.cf:
>
> #
> #
> ==========================================================================
> # service type private unpriv chroot wakeup maxproc command + args
> # (yes) (yes) (yes) (never) (50)
> #
> ==========================================================================
> smtp inet n - n - - smtpd
> pickup fifo n - n 60 1 pickup
> cleanup unix n - n - 0 cleanup
> qmgr fifo n - n 300 1 nqmgr
> rewrite unix - - n - -
> trivial-rewrite
> bounce unix - - n - 0 bounce
> defer unix - - n - 0 bounce
> flush unix n - n 1000? 0 flush
> proxymap unix - - n - - proxymap
> smtp unix - - n - - smtp
> showq unix n - n - - showq
> error unix - - n - - error
> local unix - n n - - local
> virtual unix - n n - - virtual
> lmtp unix - - n - - lmtp
> #
> # Interfaces to non-Postfix software. Be sure to examine the manual
> # pages of the non-Postfix software to find out what options it wants.
> # The Cyrus deliver program has changed incompatibly.
> #
> #
> ==========================================================================
> # service type private unpriv chroot wakeup maxproc command + args
> # (yes) (yes) (yes) (never) (50)
> #
> ==========================================================================
> maildrop unix - n n - - pipe
> flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
>
> cyrus unix - n n - - pipe
> user=cyrus argv=/usr/sbin/cyrdeliver -r ${sender} -m ${extension}
> ${user}
>
> uucp unix - n n - - pipe
> flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail
> ($recipient)
> ifmail unix - n n - - pipe
> flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop
> ($recipient)
> bsmtp unix - n n - - pipe
> flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -d -t$nexthop
> -f$sender
> $recipient
> scalemail-backend unix - n n - 2 pipe
> flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store
> ${nexthop} ${user} ${extension}
>
> smtp-amavis unix - - n - 2 lmtp
> -o smtp_data_done_timeout=1200
> -o disable_dns_lookups=yes
>
> 127.0.0.1:10025 inet n - n - - smtpd
> -o content_filter=
> -o local_recipient_maps=
> -o relay_recipient_maps=
> -o smtpd_restriction_classes=
> -o smtpd_client_restrictions=
> -o smtpd_helo_restrictions=
> -o smtpd_sender_restrictions=
> -o smtpd_recipient_restrictions=permit_mynetworks,reject
> -o mynetworks=127.0.0.0/8
> -o strict_rfc821_envelopes=yes
>
>
> Thanks
>
> David Hearn
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