I'm stumped at this point. I've got Nagios configured the way I like it, but I cannot seem to get it to actually send any notifications. I'm 99% sure the problem lies in my sendmail configuration, since the Nagios notification config is so straightforward. I am trying to get this to work with sendmail on Ubuntu, so I installed sendmail, and answered yes to all the config questions. My problem at this point is nothing will actually send. If I attempt to use the sendmail command from the terminal, the log located at /var/log/mail.log has the entries for the send attempt, but it always ends in "connection refused by alt4.gmail-smtp-in.l.google.com", or whatever domain I'm trying to send to.
After hours of research, I came across pages saying that this could be caused by an incorrect FQDN. I looked up how to set my FQDN and followed the guides. What I'm left with is this:
in the file /etc/hosts, I have:
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127.0.0.1 localhost localhost.localdomain localhost [server's name]
[server's IP address] notify.nagios.com notify
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
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notify.nagios.com
Thanks!