ODOO对几乎所有单据都内嵌了邮件系统，虽然邮件系统有助于实时和准确掌握单据变化，不过也增加了系统的开销，最终影响了性能。

在单据量非常巨大，以至于影响系统稳定性和速度时，可考虑关闭此邮件机制。

通过在特定业务中，设置context参数，具体如下：

     - ``mail_create_nosubscribe``: at create or message_post, do not subscribe
       uid to the record thread
     - ``mail_create_nolog``: at create, do not log the automatic '
       created' message
     - ``mail_notrack``: at create and write, do not perform the value tracking
       creating messages
     - ``tracking_disable``: at create and write, perform no MailThread features
       (auto subscription, tracking, post, ...)
     - ``mail_save_message_last_post``: at message_post, update message_last_post
       datetime field
     - ``mail_auto_delete``: auto delete mail notifications; True by default
       (technical hack for templates)
     - ``mail_notify_force_send``: if less than 50 email notifications to send,
       send them directly instead of using the queue; True by default
     - ``mail_notify_user_signature``: add the current user signature in
       email notifications; True by default