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I am sending a mail from my RHEL Machine and all it response positive:
[root@build ~]# echo "Hello" | mail -v -s "hi" email@example.com
firstname.lastname@example.org... 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-AUTH DIGEST-MD5 CRAM-MD5
>>> MAIL From:<email@example.com> SIZE=43 AUTHfirstname.lastname@example.org
250 2.1.0 <email@example.com>... Sender ok
>>> RCPT To:<firstname.lastname@example.org>
250 2.1.5 <email@example.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
250 2.0.0 nAQ9e99Z024196 Message accepted for delivery
firstname.lastname@example.org... Sent (nAQ9e99Z024196 Message accepted for delivery)
Closing connection to [127.0.0.1]
221 2.0.0 build.ient.com closing connection
any idea how gonna I troubleshoot?
It is using relay.
Is there any tool I can trace out where the mail is stucking.
The mail is not accepted by lonhub1.ient.com. [10.225.55.18] for some reason.
Maybe you can find the reason in the dsn sent back to you, or in the logs of lonhub1.ient.com if you have access to them.
Else try to telnet directly to lonhub1.ient.com on port 25 and see if you can send an email using the same from: and to: addresses.