Email backend settings

$config['email']['enable']          = TRUE;

Enable/Disable send email globally

$config['email']['from']            = NULL;

Mail from. Default: "Observium" <observium@`hostname -f`>

$config['email']['default']         = NULL;

Default alert recipient

$config['email']['default_only']    = FALSE;

Only use default recipient (all alerts send to default recipient)

$config['email']['backend']         = 'mail';

Mail backend. Allowed: "mail" (PHP's built-in), "sendmail", "smtp".

$config['email']['sendmail_path']   = '/usr/sbin/sendmail'; // The location of the sendmail program.

Sendmail specific options

$config['email']['smtp_host']       = 'localhost';          // Outgoing SMTP server name.
$config['email']['smtp_port']       = 25;                   // The port to connect.
$config['email']['smtp_timeout']    = 10;                   // SMTP connection timeout in seconds.
$config['email']['smtp_secure']     = NULL;                 // Enable encryption. Use 'tls' or 'ssl'
$config['email']['smtp_auth']       = FALSE;                // Whether or not to use SMTP authentication.
$config['email']['smtp_username']   = NULL;                 // SMTP username.
$config['email']['smtp_password']   = NULL;                 // Password for SMTP authentication.

SMTP specific options

For test email settings use test_mail.php script from main observium dirrectory.