Many emails are sent with “header” metadata to indicate that they are from list-based automated tools. { -brand-name-firefox-relay } detects this header data so it can block these emails.
许多邮件发送时包含“头（header）”元数据，以表明其来自基于列表的自动化工具。{ -brand-name-firefox-relay } 能够检测到此头数据，因此可以进行屏蔽。