http://observium.org/wiki/Configuration_Options#Email_backend_settings

If you not set config option:
$config['email']['default']
than alerts sent only to address specified in device contact (sysContact).
this contact mail individual for each device

On Sat, Nov 22, 2014 at 2:39 PM, Gavin Henry <ghenry@surevoip.co.uk> wrote:
Hi all,

I've read all the archives and am sure below is right, but on a recent
BGP flap from one of our peers we didn't see the email (but got an
SNMP Trap from our NMS anyway). Is this all correct or do we have to
config *all* alerts and there are no defaults?

./test_mail.php -h xxx.uk.suretec.net
Observium v0.14.11.5936
Test E-mail Configuration

My Hostname: xxx.suretec.net
E-mails ENABLED globally
E-mails use PHP-builtin MAIL backend
E-mails send from:
  "Observium" <observium@xxx.suretec.net>
Try send test notification for xxx.uk.suretec.net to these email(s):
  noc@suretec.net
Notification for xxx.suretec.net SENT.
root@xxx:/opt/observium# cat config.php
<?php

## Have a look in includes/defaults.inc.php for examples of settings
you can set here. DO NOT EDIT defaults.inc.php!

// Database config
$config['db_host'] = "localhost";
$config['db_user'] = "xxx";
$config['db_pass'] = "xxx";
$config['db_name'] = "xxx";

// Location
$config['install_dir']  = "/opt/observium";

// Thie should *only* be set if you want to *force* a particular hostname/port
// It will prevent the web interface being usable form any other hostname
#$config['base_url']        = "http://observium.company.com";

// Default community list to use when adding/discovering
$config['snmp']['community'] = array("xxx");

// Authentication Model - move to LDAP once confirmed.
$config['auth_mechanism'] = "mysql";    // default, other options:
ldap, http-auth, please see documentation for config help

// Enable alerter
// $config['poller-wrapper']['alerter']       = TRUE;

//$config['enable_syslog'] = "1";

## Enable email backend settings
$config['email']['enable']       = TRUE;

// Needed on subscription product
//$config['alerts']['email']['enable']       = FALSE;

$config['enable_billing']               = 1;


// End config.php



--
Kind Regards,
Gavin Henry.
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--
Mike Stupalov
http://observium.org/