LinuxQuestions.org - mail command issue?

I am sending a mail from my RHEL Machine and all it response positive:

Code:

[root@build ~]# echo "Hello" | mail -v -s "hi" ar2@ient.com

ar2@ient.com... Connecting to [127.0.0.1] via relay...

220 build.ient.com ESMTP Sendmail 8.13.1/8.13.1; Thu, 26 Nov 2009 15:10:09 +0530

>>> EHLO bbuild.ient.com

250-build.ient.com Hello localhost.localdomain [127.0.0.1], pleased to meet you

250-ENHANCEDSTATUSCODES

250-PIPELINING

250-8BITMIME

250-SIZE

250-DSN

250-ETRN

250-AUTH DIGEST-MD5 CRAM-MD5

250-DELIVERBY

250 HELP

>>> MAIL From:<root@build.ient.com> SIZE=43 AUTH=root@build.ient.com

250 2.1.0 <root@build.ient.com>... Sender ok

>>> RCPT To:<ar2@ient.com>

>>> DATA

250 2.1.5 <ar2@ient.com>... Recipient ok

354 Enter mail, end with "." on a line by itself

>>> .

250 2.0.0 nAQ9e99Z024196 Message accepted for delivery

ar2@ient.com... Sent (nAQ9e99Z024196 Message accepted for delivery)

Closing connection to [127.0.0.1]

>>> QUIT

221 2.0.0 build.ient.com closing connection

[root@build ~]#

any idea how gonna I troubleshoot?
It is using relay.
Is there any tool I can trace out where the mail is stucking.

The Maillog are:

Code:

Nov 26 15:07:06 build.com sendmail[24187]: nAQ9b0Up024185: to=<ar2@ient.com>, ctladdr=<root@build.com.ient.com> (0/0), delay=00:00:06, xdelay=00:00:06, mailer=esmtp, pri=120360, relay=delhub1.ient.com. [10.210.55.18], dsn=5.0.0, stat=Service unavailable

Nov 26 15:07:06 build.com sendmail[24187]: nAQ9b0Up024185: nAQ9b6Up024187: DSN: Service unavailable

Nov 26 15:07:06 build.com sendmail[24187]: nAQ9b6Up024187: to=<root@build.com.ient.com>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31626, dsn=2.0.0, stat=Sent

Nov 26 15:10:09 build.com sendmail[24195]: nAQ9e9rN024195: from=root, size=43, class=0, nrcpts=1, msgid=<200911260940.nAQ9e9rN024195@build.com.ient.com>, relay=root@localhost

Nov 26 15:10:09 build.com sendmail[24196]: nAQ9e99Z024196: from=<root@build.com.ient.com>, size=360, class=0, nrcpts=1, msgid=<200911260940.nAQ9e9rN024195@build.com.ient.com>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]

Nov 26 15:10:09 build.com sendmail[24195]: nAQ9e9rN024195: to=ar2@ient.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30043, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (nAQ9e99Z024196 Message accepted for delivery)

Nov 26 15:10:10 build.com sendmail[24198]: STARTTLS=client, relay=lonhub1.ient.com., version=TLSv1/SSLv3, verify=FAIL, cipher=AES128-SHA, bits=128/128

Nov 26 15:10:16 build.com sendmail[24198]: nAQ9e99Z024196: to=<ar2@ient.com>, ctladdr=<root@build.com.ient.com> (0/0), delay=00:00:07, xdelay=00:00:07, mailer=esmtp, pri=120360, relay=lonhub1.ient.com. [10.225.55.18], dsn=5.0.0, stat=Service unavailable

Nov 26 15:10:16 build.com sendmail[24198]: nAQ9e99Z024196: nAQ9eG9Z024198: DSN: Service unavailable

Nov 26 15:10:16 build.com sendmail[24198]: nAQ9eG9Z024198: to=<root@build.com.ient.com>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31626, dsn=2.0.0, stat=Sent

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