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Mailx command not working from one sudo ID

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Last Modified: 2017-11-18
Few days back any mail related command ( mailx, mail ,mpack  ) stopped working from one sudo id .
in the logs i get error as dsn=5.6.0, stat=Data format error
but this happens with only one sudo ID-sudo1@my_hostname
another id -sudo2 works fine with any of the mail command

sudo su sudo1
mailx -s "Test mail" someone@example < /tmp/test.file
/home/sudo1/dead.letter... Saved message in /home/sudo1/dead.letter
where from=sudo1@my_hostname
message fails to sent


sudo su sudo2
mailx -s "Test mail" someone@example < /tmp/test.file
where from=sudo2@my_hostname
message successfully sent and received.

Not getting why with one prefix it is sent and other fails ... ?
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