<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> <a class="moz-txt-link-abbreviated" href="mailto:admin@lctn.org">admin@lctn.org</a> wrote: <blockquote cite="mid2424.64.8.148.4.1171643175.squirrel@lctn.org" type="cite"> <blockquote type="cite"> <pre wrap="">If you "su" to the Nagios user, and just run "mail" - does it yield anything, or "command not found"? The error seems to be (as someone previously said) it's piping your notification text to " -s "Host DOWN..."" which isn't a valid command. You need to change your notification command to pipe the result to "mail -s ...." instead of " -s ..." You may also need to try "sendmail" (I don't use sendmail so I don't know if "mail" is part of it or not.) </pre> </blockquote> <pre wrap=""> I inserted "sendmail", but still get the err. I am working on the syntax to see if I can resolve the error. What does everyone else have installed that the "mail" command works. I really don't care what MTA is used, just so I can get the sample, and new configs to work. I assumed on the install it would locate sendmail and insert the appropriate commands, but obviously, I was wrong. </pre> </blockquote> No, Nagios doesn't assume anything because everyone's networks/servers are setup differently. Try an absolute path to sendmail (use "whereis sendmail" to locate it if you're not sure.) The trick is to (while logged in or "su'd" to the Nagios user) manually type out a command and keep adjusting until it works - then put that into Nagios. e.g. echo "Test e-mail"|/usr/sbin/sendmail -s "Host DOWN" <a class="moz-txt-link-abbreviated" href="mailto:admin@domain.com">admin@domain.com</a> Andy. </body> </html>