c := utl_smtp.open_connection(
        host => 'smtp.office365.com',
        port => 587,
        wallet_path => 'file:/u00/app/oracle/product/12.2.0/orcl/data/wallet',
        wallet_password => '[passwd]',
        secure_connection_before_smtp => FALSE,
        secure_host => 'Outlook.office.com');