Cannot receive emails

echo "test message" | /usr/sbin/sendmail -v myemail@mydomain.it 

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

$config['email']['from'] = "'Observium' <geoobs@geo.local>";

$config['email']['default'] = "XXXXXX@myaddress.it";

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

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

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

$config['email']['smtp_host'] = 'smtp-relay.sendinblue.com'; // Outgoing SMTP server name.

$config['email']['smtp_port'] = 587; // The port to connect.

$config['email']['smtp_timeout'] = 10; // SMTP connection timeout in seconds.

$config['email']['smtp_secure'] = "tls"; // Enable encryption. Use 'tls' or 'ssl' or 'starttls'

$config['email']['smtp_auth'] = TRUE; // Whether or not to use SMTP authentication.

$config['email']['smtp_username'] = "XXXXXXX@XXXXXX.it"; // SMTP username.

$config['email']['smtp_password'] = "XXXXXXXXXXXXXXX"; // Password for SMTP authentication.