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 email@example.com) with no problem.
Mar 7 14:45:29 newton sm-mta: r27JjOw1017159: to=, ctladdr= (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
Sometimes it says stat=Unable to relay and sometimes stat=Sent, but in every case the emails are never received.
Also, I get this:
Does that mean the firstname.lastname@example.org 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!