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Installed Nagios but Nagios was quit voiceless, so I want to send notifications via sendmail. Sendmail is installed by default with Freebsd and as I don’t wanted to build a hole mail server from scratch I want to use our MS Exchange server.

First of all check the DNS Setting of your Domain and make sure your FreeBSD machine got a DNS (A) Record.

To make sure it works you should get this response:

>hostname
nagios.domain.at
>host nagios.domain.at
nagios.doman.at has address 100.100.111.111

 
If you don’t get this, have a look at DNS table.

Now allow SMTP connection from you BSD host to the exchange server as seen in the screener below .

After that you have to tell the Freebsdhost to use an alternative agent

> vi /etc/mail/freebsd.submit.mc

change the line

FEATURE(`msp', `[127.0.0.1]')dnl

To

FEATURE(`msp', `[Ip of the Exchange server]')dnl

Or use instead of IP the FQDN (not tested by me)

Now install the submit.cf

>cd /etc/mail && make install-submit-cf

 
If everything worked fine, you should see an output like this:

cp freebsd.submit.mc [hostname].[domain].submit.mc
/usr/bin/m4 -D_CF_DIR_=/usr/share/sendmail/cf/   /usr/share/sendmail/cf/m4/cf.m4 [hostname].[domain].submit.mc > [hostname].[domain].submit.cf
install -m 444 [hostname].[domain].submit.cf /etc/mail/submit.cf

 
Now test the mailsending via with ‘mail’

>mail –v [exchangeuser@domain]

 
Now you should see a lot of lines starting with

[exchangeuser@domain]... Connecting to [100.100.111.111] via relay...
220 EXCHANGE.doman.dc Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready

Now check your Mail client, there should be a mail sent from your logged in user