Sendmail Error

Hi All,

I am using mail server on Redhat Linux 7 having
Sendmail-8.11.2-14
when i am sending any mail it is successfull deliverd by
getting a
mail from Mailer-Daemon that



The following addresses had permanent fatal errors -----

    (reason: 553 sorry, your envelope sender domain must
exist (#5.7.1))


Sep 25 15:16:30 localserver sendmail[26990]: k8P9kSb26990:
to=krishnadineshwargmail.com, ctladdr=root (0/0),
delay=00:00:02,
xdelay=00:00:01, mailer=relay, pri=30044,
relay=mail.relay.com.
[203.122.58.62], dsn=5.6.0, stat=Data format error


is any one to give me the hint how to solve it, what
exacallty the problem.


Thanks,

Dinesh
New Delhi

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