SMTP / POP3 not working ??

I have intalled RH Linux 2.0.32 .
When I want to forward my messages from a browser using
my Linux server . Following error occurs

we don't relay messages.
Please help
amreshAsked:
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henckensCommented:
If you get that message from your own linux, you probably have sendmail 8.9.0 or 8.9.1 installed (check with 'telnet localhost 25').  In the sendmail.cf (mostly in /var/adm/sendmail or /etc) there is an entry 'hosts that permit relaying' mostly a file called relay-domains.  You have give your own computer permission to relay your messages.
If you get that message from other systems (you are using another system as your smtp server), you have to add your computername or domain to that configfile on that machine.  The best is to have your own sendmail on your own machine off course.
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