Unable to encrypt message. Please check that you have a valid email certificate for each recipient. Please check that the certificates specified in Mail & Newsgroups Account Settings for this mail account are valid and trusted for mail.
无法加密消息。请检查您对每个收件人是否都有一个有效的电子邮件证书。请在邮件 & 新闻组账户设置中为此邮件账户选中有效且可信的证书供邮件所用。