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    Trying to configure sendmail in Debian


    I'm trying to configure sendmail on our Debian Linux server to send mail, using our Exchange server as a relay. I'm a total noob at all of this.

    We can send mails to internal addresses (for example, if our domain name is ourdomain.com, the server can send mail to bob@ourdomain.com) with no problem.

    We can't send mail to external addresses like bob@gmail.com or bob@hotmail.com. Here's an example of what I get in /var/log/mail.log

    Mar 7 14:45:29 newton sm-mta[17159]: r27JjOw1017159: to=<user9999@gmail.com>, ctladdr=<root@newton.forrest> (0/0), delay=00:00:05, xdelay=00:00:05, mailer=relay, pri=30455, relay=webmail.ourdomain.ws. [xxx.xxx.xxx.xxx], dsn=5.7.1, stat=User unknown

    Also, I get this:

    Code:
    root@newton:/etc/mail# sendmail -bv user9999@gmail.com
    
    user9999@gmail.com... deliverable: mailer relay, host webmail.ourdomain.ws, user user9999@gmail.com
    Does that mean the user9999@gmail.com is unknown to newton, or unknown to Exchange?

    Is there something in Exchange we need to configure?

    I have no idea what to configure. Please help. Thanks!
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    Have you configured DNS correctly. Is your MX record pointing to correct server?

    Paste the output of
    cat /etc/sendmail.cf , /etc/mail/relay-domains and /etc/mail/access

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