Failed to Send Notification

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of adi yesaya
> Sent: Friday, May 11, 2007 6:02 AM
> To: Nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Failed to Send Notification
> 
> Dear Nagios-ers,
> 
> I tried to send email notifications, some succeed, some not. The ones
> which failed, had this error message:
> 
>    ----- Transcript of session follows
-----------------------------------
> -
> 
> ... while talking to fallback.nl.uu.net.:
> 
> <<< 550-Verification failed for <nagios at localhost.localdomain>
> 
> <<< 550-Domain localhost.localdomain not found in DNS

<chop>

Fallback.nl.uu.net is rejecting the e-mail because the MTA on your
nagios box, not nagios itself, is claiming to be called
localhost.localdomain, which is an unverifiable name. It's very
reasonable that they would do that. You need to configure the MTA on
your nagios box to use a real hostname that can be found in the DNS.
This may be as simple as adding the hostname to your DNS and editing
your /etc/hosts file on your nagios box, changing the 127.0.0.1 entry to
something like --

127.0.0.1 yourhost.yourdomain.foo localhost.localdomain

You'd need to restart your MTA if it's running as a daemon after making
that change. If that doesn't work, you'll need to specifically configure
the MTA that you're using to masquerade as that host or domain. You can
do this for Sendmail by setting the MASQUERADE_AS macro. Under Postfix I
believe it's the myorigin variable.

--
Marc

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