Thanks zazzybob...!!!

But after doing the configuration by following the web link given by you, I am facing the problem while sending mails from my SuSE Linux box.

Error from /var/log/mail file:

Jul 26 14:03:23 cn2 postfix/pickup[12829]: 1C9D635DBC: uid=0 from=<root>

Jul 26 14:03:23 cn2 postfix/cleanup[3563]: 1C9D635DBC: message-id=<20070726083323.1C9D635DBC@linux.local>

Jul 26 14:03:23 cn2 postfix/qmgr[12830]: 1C9D635DBC: from=<root@.xyz.com>, size=307, nrcpt=1 (queue active)

Jul 26 14:03:23 cn2 postfix/smtp[3565]: 1C9D635DBC: to=<ganesh@xyz.com>, relay=smtp.xyz.com[10.10.20.206], delay=0, status=bounced (host smtp.xyz.com[10.10.20.206] said: 501 Bad address syntax)

Jul 26 14:03:23 cn2 postfix/cleanup[3563]: 33CAF35DD1: message-id=<20070726083323.33CAF35DD1@linux.local>

Jul 26 14:03:23 cn2 postfix/qmgr[12830]: 33CAF35DD1: from=<>, size=1936, nrcpt=1 (queue active)

Jul 26 14:03:23 cn2 postfix/qmgr[12830]: 33CAF35DD1: to=<root@.xyz.com>, relay=none, delay=0, status=bounced (bad host/domain syntax: ".xyz.com")

When I send mail using “mail” command, it takes “.” from myorigin = $smtp.xyz.com entry of main.cf file.

If I change myorigin to myorigin = $smtp@xyz.com, in the output of mail log file, from address will be
from=<root@@xyz.com>.

Entries from /etc/postfix/main.cf file :

#myorigin = $myhostname
myorigin = $smtp.xyz.com

mynetworks = 127.0.0.0/8 10.10.20.206/24
#mynetworks = $config_directory/mynetworks
#mynetworks = hash:/etc/postfix/network_table

relayhost = $smtp.xyz.com
#relayhost = gateway.my.domain
#relayhost = uucphost
#relayhost = [an.ip.add.ress]

#mydestination = $myhostname, localhost.$mydomain
mydestination = $cn2, localhost.$smtp.xyz.com $smtp.xyz.com
#mydestination = $myhostname, localhost.$mydomain, $mydomain,

Can anyone please help me out to resolve this issue...!!!

Thanks & Regards,
jumadhiya.