Alert emails stopped after hostname change


I’ve attempted to change the hostname of my machine, now Nagios stopped sending out alert emails.

I’ve changed the hostname back using hostname oldhostname, however even after a complete reboot, nagios no longer works. Yes, it did work before and was sending out nofications just fine.

Also, doing a printf text | mail -s “test” emailaddress here works just fine as well.

Here’s what my /etc/hosts file looks like:

Do not remove the following line, or various programs

that require network functionality will fail. nag localhost.localdomain localhost


This is no longer a problem - emails started flowing again