Kanboard email problem

// E-mail address used for the "From" header (notifications)
define('MAIL_FROM', 'kanboard@greentree.systems');

// Mail transport available: "smtp", "sendmail", "mail" (PHP mail function), "postmark", "mailgun", "sendgrid"
define('MAIL_TRANSPORT', 'smtp');

// SMTP configuration to use when the "smtp" transport is chosen
define('MAIL_SMTP_HOSTNAME', 'mail.google.com');
define('MAIL_SMTP_PORT', 587);
define('MAIL_SMTP_USERNAME', 'roland@********.net');
define('MAIL_SMTP_PASSWORD', '*******');
define('MAIL_SMTP_ENCRYPTION', 'tls'); // Valid values are "null", "ssl" or "tls"

// Sendmail command to use when the transport is "sendmail"
define('MAIL_SENDMAIL_COMMAND', '/usr/sbin/sendmail -bs');