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sendmail configuration on RHEL4

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http://www.linuxquestions.org – Hello, I am writing a shell script to send emails to my company mail id when disk usage on the server exceeds a threshold. I tried to send email using sendmail on RHEL5. The mail delivery was successful and I received the email in my mailbox. (I didn't configure anything in sendmail. I tried with default sendmail configuration on RHEL5.) The problem is, when I try to send mail using sendmail on RHEL4 (with Default configuration), I get the following error in /var/log/maillog " dsn=5.1.1, stat=User unknown Jan 5 01:49:57 RHEL4 sendmail[28513]: p04KJr2B028511: p04KJv2B028513: DSN: Us (HowTos)