RT not accepting mails

Hi,

Just installed RT when tried to send a mail to RT application below is the
error I notice in /var/logl/maillog

Aug 3 17:47:49 rtapps sendmail[438]: j73EsjZs031772:
to="|/etc/smrsh/rt-mailgate --queue AppsDBA --action correspond --url
http://192.168.147.132/",
ctladdr=rt@support.sierraopt.com (8/0), delay=06:53:04, xdelay=00:00:01,
mailer=prog, pri=1200620,
dsn=4.0.0, stat=Deferred: prog mailer (/usr/sbin/smrsh) exited with
EX_TEMPFAIL

Thanks in advance.

Regards,
Srinivas Balan
"The information contained in this message and the attachments (if any) may
be privileged and confidential and protected from disclosure. You are hereby
notified that any unauthorized use, dissemination, distribution or copying
of this communication, review, retransmission, or taking of any action based
upon this information, by persons or entities other than the intended
recipient, is strictly prohibited. If you are not the intended recipient or
an employee or agent responsible for delivering this message, and have
received this communication in error, please notify us immediately by
replying to the message and kindly delete the original message, attachments,
if any, and all its copies from your computer system. Thank you for your
cooperation."