Hello

I'm using Qmail on RedHat4 server along with spamd, SquirrelMail and pop3d addons

Output of ps -A command is

Code:
mail control]# ps -A
  PID TTY          TIME CMD
    1 ?        00:00:01 init
    2 ?        00:00:00 migration/0
    3 ?        00:00:00 ksoftirqd/0
    4 ?        00:00:00 migration/1
    5 ?        00:00:00 ksoftirqd/1
    6 ?        00:00:00 events/0
    7 ?        00:00:00 events/1
    8 ?        00:00:00 khelper
    9 ?        00:00:00 kacpid
   47 ?        00:00:00 kblockd/0
   48 ?        00:00:00 kblockd/1
   49 ?        00:00:00 khubd
   72 ?        00:00:00 pdflush
   73 ?        00:00:01 pdflush
   76 ?        00:00:00 aio/0
   74 ?        00:00:00 kswapd1
   75 ?        00:00:00 kswapd0
   77 ?        00:00:00 aio/1
  221 ?        00:00:00 kseriod
  339 ?        00:00:00 scsi_eh_0
  346 ?        00:00:00 scsi_eh_1
  373 ?        00:00:12 kjournald
 1268 ?        00:00:00 udevd
 1873 ?        00:00:00 shpchpd_event
 2158 ?        00:00:00 kauditd
 2420 ?        00:00:00 scsi_eh_2
 2421 ?        00:00:00 usb-storage
 2444 ?        00:00:00 scsi_eh_3
 2445 ?        00:00:00 usb-storage
 2594 ?        00:00:00 kmirrord
 2741 ?        00:00:04 kjournald
 2742 ?        00:00:00 kjournald
 2743 ?        00:00:03 kjournald
 2744 ?        00:00:19 kjournald
 2745 ?        00:00:00 kjournald
 3321 ?        00:00:14 syslogd
 3325 ?        00:00:00 klogd
 3334 ?        00:00:00 courierlogger
 3335 ?        00:00:00 authdaemond
 3343 ?        00:00:05 authdaemond
 3344 ?        00:00:05 authdaemond
 3345 ?        00:00:05 authdaemond
 3346 ?        00:00:06 authdaemond
 3347 ?        00:00:05 authdaemond
 3381 ?        00:00:19 sshd
 3391 ?        00:17:09 clamd
 3403 ?        00:00:04 courierlogger
 3404 ?        00:00:05 couriertcpd
 3423 ?        00:00:05 spamd
 3434 ?        00:00:00 httpd
 3443 ?        00:00:00 crond
 3450 ?        00:00:03 freshclam
 3456 ?        00:06:20 httpd
 3457 ?        00:06:22 httpd
 3458 ?        00:06:13 httpd
 3459 ?        00:06:26 httpd
 3460 ?        00:06:18 httpd
 3462 ?        00:00:00 mysqld_safe
 3472 tty1     00:00:00 mingetty
 3477 tty2     00:00:00 mingetty
 3479 tty3     00:00:00 mingetty
 3480 tty4     00:00:00 mingetty
 3529 tty5     00:00:00 mingetty
 3531 tty6     00:00:00 mingetty
 3533 ?        00:00:00 svscanboot
 4109 ?        00:00:08 svscan
 4110 ?        00:00:00 readproctitle
 4111 ?        00:00:00 supervise
 4112 ?        00:00:00 supervise
 4113 ?        00:00:00 supervise
 4114 ?        00:00:00 supervise
 4115 ?        00:00:00 supervise
 4116 ?        00:00:00 supervise
 4122 ?        00:00:01 multilog
 4124 ?        00:00:00 multilog
 4125 ?        00:00:01 multilog
 4135 ?        00:00:26 mysqld
 4146 ?        00:06:30 httpd
 4168 ?        00:06:32 httpd
 4916 ?        00:06:18 httpd
 4917 ?        00:06:13 httpd
 4918 ?        00:06:18 httpd
 9309 ?        00:00:13 spamd
27012 ?        00:00:00 spamd
 1356 ?        00:00:00 sshd
 1366 pts/0    00:00:00 bash
 1443 ?        00:00:00 tcpserver
 1445 ?        00:00:00 tcpserver
 1782 ?        00:00:00 qmail-send
 1783 ?        00:00:00 qmail-lspawn
 1784 ?        00:00:00 qmail-rspawn
 1785 ?        00:00:00 qmail-clean
 3712 pts/0    00:00:00 ps

and of qmail-showctl is

Code:
[root@mail control]# /var/qmail/bin/qmail-showctl
qmail home directory: /var/qmail.
user-ext delimiter: -.
paternalism (in decimal): 2.
silent concurrency limit: 120.
subdirectory split: 23.
user ids: 605, 602, 603, 0, 604, 606, 607, 608.
group ids: 602, 603.

badmailfrom: (Default.) Any MAIL FROM is allowed.

bouncefrom: Bounce user name is postmaster.

bouncehost: (Default.) Bounce host name is m**.net

concurrencylocal: (Default.) Local concurrency is 10.

concurrencyremote: (Default.) Remote concurrency is 20.

databytes: SMTP DATA limit is 10000000 bytes.

defaultdomain: Default domain name is m**.net.

defaulthost: (Default.) Default host name is m**.net

doublebouncehost: 2B recipient host: mail.m**.net

doublebounceto: 2B recipient user: doublebounce.

envnoathost: (Default.) Presumed domain name is m**.net

helohost: (Default.) SMTP client HELO host name is m**.net

idhost: (Default.) Message-ID host name is m**.net

localiphost: (Default.) Local IP address becomes m**.net

locals:

me: My name is m***.net

percenthack: (Default.) The percent hack is not allowed.

plusdomain: Plus domain name is net

qmqpservers: (Default.) No QMQP servers.

queuelifetime: Message lifetime in the queue is 6600 seconds.

rcpthosts:
SMTP clients may send messages to recipients at m***.org
SMTP clients may send messages to recipients at s***.net

morercpthosts: (Default.) No effect.

morercpthosts.cdb: (Default.) No effect.

smtpgreeting: (Default.) SMTP greeting: 220 m***.net

smtproutes: (Default.) No artificial SMTP routes.

timeoutconnect: (Default.) SMTP client connection timeout is 60 seconds.

timeoutremote: (Default.) SMTP client data timeout is 1200 seconds.

timeoutsmtpd: (Default.) SMTP server data timeout is 1200 seconds.

virtualdomains:
Virtual domain: m**.org:m**.org
Virtual domain: m**.net:m**.net

badmailto: I have no idea what this file does.

queuelifetime1: I have no idea what this file does.

locals.lock: I have no idea what this file does.

virtualdomains.lock: I have no idea what this file does.

rcpthosts.lock: I have no idea what this file does.


Trouble is that, if a message is sent to any non-existent user, the sender doesn't get any delivery failure message. Only time any user gets a mail delivery failure message is when the user sends a mail to a non-existing domain. No mail delivery failure is received by the sender inside or outside my domain when mail delivery fails at address of my domain.
I decreased queuelifetime to nearly 6000 seconds but that didn't help my cause.
Is there anything that needs to be configured separately for mail delivery failure messages to be sent?