2 questions about mail server

From: mike (Nosend_at_n1o2sp2am.go.com)
Date: 02/12/04 

Date: Thu, 12 Feb 2004 06:12:27 GMT

Hi guys,

I am using rethat7.3+sendmail.

(1)
users can send and get emails by using sendmail server within local network
for example:(my domain is myexample.net)
user mike can send an email to tony by using either

tony or tony@myexample.net

and tony can read his emails.

but if mike sends an email to tony by using tony@myexample.net from outside
of local network( from internet , for example, from a public library by using
mike's email account at xxxx@yahoo.com, then there is no error message and
NO MAILER-DAEMON@yahoo.com... It seems the mail was sent out, but
tony did not get the mail from mike. There is no such email in the server.

What's wrong within my sendmail server?

(2)if I use
>sendmail status
then I will get

status....user unknown

I think something is wrong with my sendmail server, can some one tell
me how to fix it?

Thank you so much in advance!

mike

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