mail.compose.message.form.mass_mailing mail.compose.message {'invisible': [ '|', ('is_log', '=', False), '&', ('mass_mailing_name', '!=', ''), ('mass_mailing_name', '!=', False) ]} {'invisible': [ '|', ('is_log', '=', True), '&', ('mass_mailing_name', '!=', ''), ('mass_mailing_name', '!=', False) ]}